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  Subjects -> ELECTRONICS (Total: 179 journals)
Showing 1 - 200 of 277 Journals sorted alphabetically
Acta Electronica Malaysia     Open Access  
Advances in Biosensors and Bioelectronics     Open Access   (Followers: 7)
Advances in Electrical and Electronic Engineering     Open Access   (Followers: 5)
Advances in Electronics     Open Access   (Followers: 78)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Microelectronic Engineering     Open Access   (Followers: 13)
Advances in Power Electronics     Open Access   (Followers: 33)
Advancing Microelectronics     Hybrid Journal  
Aerospace and Electronic Systems, IEEE Transactions on     Hybrid Journal   (Followers: 313)
American Journal of Electrical and Electronic Engineering     Open Access   (Followers: 24)
Annals of Telecommunications     Hybrid Journal   (Followers: 9)
APSIPA Transactions on Signal and Information Processing     Open Access   (Followers: 9)
Archives of Electrical Engineering     Open Access   (Followers: 13)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 28)
Bioelectronics in Medicine     Hybrid Journal  
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 19)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 36)
Biomedical Instrumentation & Technology     Hybrid Journal   (Followers: 6)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
BULLETIN of National Technical University of Ukraine. Series RADIOTECHNIQUE. RADIOAPPARATUS BUILDING     Open Access   (Followers: 1)
Bulletin of the Polish Academy of Sciences : Technical Sciences     Open Access   (Followers: 1)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 47)
China Communications     Full-text available via subscription   (Followers: 8)
Chinese Journal of Electronics     Hybrid Journal  
Circuits and Systems     Open Access   (Followers: 15)
Consumer Electronics Times     Open Access   (Followers: 5)
Control Systems     Hybrid Journal   (Followers: 266)
Edu Elektrika Journal     Open Access   (Followers: 1)
Electrica     Open Access  
Electronic Design     Partially Free   (Followers: 105)
Electronic Markets     Hybrid Journal   (Followers: 7)
Electronic Materials Letters     Hybrid Journal   (Followers: 4)
Electronics     Open Access   (Followers: 86)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 10)
Electronics For You     Partially Free   (Followers: 92)
Electronics Letters     Hybrid Journal   (Followers: 26)
Elkha : Jurnal Teknik Elektro     Open Access  
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 51)
Energy Harvesting and Systems     Hybrid Journal   (Followers: 4)
Energy Storage Materials     Full-text available via subscription   (Followers: 3)
EPJ Quantum Technology     Open Access  
EURASIP Journal on Embedded Systems     Open Access   (Followers: 11)
Facta Universitatis, Series : Electronics and Energetics     Open Access  
Foundations and Trends® in Communications and Information Theory     Full-text available via subscription   (Followers: 6)
Foundations and Trends® in Signal Processing     Full-text available via subscription   (Followers: 10)
Frequenz     Hybrid Journal   (Followers: 1)
Frontiers of Optoelectronics     Hybrid Journal   (Followers: 1)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 189)
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 4)
IACR Transactions on Symmetric Cryptology     Open Access  
IEEE Antennas and Propagation Magazine     Hybrid Journal   (Followers: 97)
IEEE Antennas and Wireless Propagation Letters     Hybrid Journal   (Followers: 77)
IEEE Journal of Emerging and Selected Topics in Power Electronics     Hybrid Journal   (Followers: 46)
IEEE Journal of the Electron Devices Society     Open Access   (Followers: 9)
IEEE Journal on Exploratory Solid-State Computational Devices and Circuits     Hybrid Journal   (Followers: 1)
IEEE Power Electronics Magazine     Full-text available via subscription   (Followers: 66)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 70)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 56)
IEEE Transactions on Circuits and Systems for Video Technology     Hybrid Journal   (Followers: 19)
IEEE Transactions on Consumer Electronics     Hybrid Journal   (Followers: 40)
IEEE Transactions on Electron Devices     Hybrid Journal   (Followers: 19)
IEEE Transactions on Information Theory     Hybrid Journal   (Followers: 26)
IEEE Transactions on Power Electronics     Hybrid Journal   (Followers: 71)
IEEE Transactions on Signal and Information Processing over Networks     Full-text available via subscription   (Followers: 12)
IEICE - Transactions on Electronics     Full-text available via subscription   (Followers: 12)
IEICE - Transactions on Information and Systems     Full-text available via subscription   (Followers: 5)
IET Cyber-Physical Systems : Theory & Applications     Open Access   (Followers: 1)
IET Microwaves, Antennas & Propagation     Hybrid Journal   (Followers: 35)
IET Nanodielectrics     Open Access  
IET Power Electronics     Hybrid Journal   (Followers: 46)
IET Smart Grid     Open Access  
IET Wireless Sensor Systems     Hybrid Journal   (Followers: 18)
IETE Journal of Education     Open Access   (Followers: 4)
IETE Journal of Research     Open Access   (Followers: 11)
IETE Technical Review     Open Access   (Followers: 13)
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)     Open Access   (Followers: 3)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 58)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 24)
Informatik-Spektrum     Hybrid Journal   (Followers: 2)
Instabilities in Silicon Devices     Full-text available via subscription   (Followers: 1)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 13)
International Journal of Advanced Research in Computer Science and Electronics Engineering     Open Access   (Followers: 18)
International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems     Open Access   (Followers: 10)
International Journal of Antennas and Propagation     Open Access   (Followers: 11)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 5)
International Journal of Computational Vision and Robotics     Hybrid Journal   (Followers: 6)
International Journal of Control     Hybrid Journal   (Followers: 12)
International Journal of Electronics     Hybrid Journal   (Followers: 7)
International Journal of Electronics and Telecommunications     Open Access   (Followers: 13)
International Journal of Granular Computing, Rough Sets and Intelligent Systems     Hybrid Journal   (Followers: 2)
International Journal of High Speed Electronics and Systems     Hybrid Journal  
International Journal of Image, Graphics and Signal Processing     Open Access   (Followers: 14)
International Journal of Microwave and Wireless Technologies     Hybrid Journal   (Followers: 8)
International Journal of Nano Devices, Sensors and Systems     Open Access   (Followers: 12)
International Journal of Nanoscience     Hybrid Journal   (Followers: 1)
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields     Hybrid Journal   (Followers: 4)
International Journal of Power Electronics     Hybrid Journal   (Followers: 24)
International Journal of Review in Electronics & Communication Engineering     Open Access   (Followers: 4)
International Journal of Sensors, Wireless Communications and Control     Hybrid Journal   (Followers: 10)
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 4)
International Journal of Wireless and Microwave Technologies     Open Access   (Followers: 6)
International Transaction of Electrical and Computer Engineers System     Open Access   (Followers: 2)
JAREE (Journal on Advanced Research in Electrical Engineering)     Open Access  
Journal of Biosensors & Bioelectronics     Open Access   (Followers: 3)
Journal of Advanced Dielectrics     Open Access   (Followers: 1)
Journal of Artificial Intelligence     Open Access   (Followers: 10)
Journal of Circuits, Systems, and Computers     Hybrid Journal   (Followers: 4)
Journal of Computational Intelligence and Electronic Systems     Full-text available via subscription   (Followers: 1)
Journal of Electrical and Electronics Engineering Research     Open Access   (Followers: 24)
Journal of Electrical Bioimpedance     Open Access   (Followers: 2)
Journal of Electrical Engineering & Electronic Technology     Hybrid Journal   (Followers: 7)
Journal of Electrical, Electronics and Informatics     Open Access  
Journal of Electromagnetic Analysis and Applications     Open Access   (Followers: 7)
Journal of Electromagnetic Waves and Applications     Hybrid Journal   (Followers: 8)
Journal of Electronic Design Technology     Full-text available via subscription   (Followers: 6)
Journal of Electronics (China)     Hybrid Journal   (Followers: 4)
Journal of Energy Storage     Full-text available via subscription   (Followers: 4)
Journal of Engineered Fibers and Fabrics     Open Access  
Journal of Field Robotics     Hybrid Journal   (Followers: 2)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 167)
Journal of Information and Telecommunication     Open Access   (Followers: 1)
Journal of Intelligent Procedures in Electrical Technology     Open Access   (Followers: 3)
Journal of Low Power Electronics     Full-text available via subscription   (Followers: 7)
Journal of Low Power Electronics and Applications     Open Access   (Followers: 9)
Journal of Microelectronics and Electronic Packaging     Hybrid Journal  
Journal of Microwave Power and Electromagnetic Energy     Hybrid Journal  
Journal of Microwaves, Optoelectronics and Electromagnetic Applications     Open Access   (Followers: 10)
Journal of Nuclear Cardiology     Hybrid Journal  
Journal of Optoelectronics Engineering     Open Access   (Followers: 4)
Journal of Physics B: Atomic, Molecular and Optical Physics     Hybrid Journal   (Followers: 28)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 11)
Journal of Semiconductors     Full-text available via subscription   (Followers: 5)
Journal of Sensors     Open Access   (Followers: 26)
Journal of Signal and Information Processing     Open Access   (Followers: 9)
Jurnal Rekayasa Elektrika     Open Access  
Jurnal Teknik Elektro     Open Access  
Jurnal Teknologi Elektro     Open Access  
Kinetik : Game Technology, Information System, Computer Network, Computing, Electronics, and Control     Open Access  
Learning Technologies, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Magnetics Letters, IEEE     Hybrid Journal   (Followers: 7)
Majalah Ilmiah Teknologi Elektro : Journal of Electrical Technology     Open Access   (Followers: 2)
Metrology and Measurement Systems     Open Access   (Followers: 5)
Microelectronics and Solid State Electronics     Open Access   (Followers: 18)
Nanotechnology Magazine, IEEE     Full-text available via subscription   (Followers: 33)
Nanotechnology, Science and Applications     Open Access   (Followers: 6)
Nature Electronics     Hybrid Journal  
Networks: an International Journal     Hybrid Journal   (Followers: 5)
Open Electrical & Electronic Engineering Journal     Open Access  
Open Journal of Antennas and Propagation     Open Access   (Followers: 8)
Optical Communications and Networking, IEEE/OSA Journal of     Full-text available via subscription   (Followers: 15)
Paladyn. Journal of Behavioral Robotics     Open Access   (Followers: 1)
Power Electronics and Drives     Open Access   (Followers: 1)
Problemy Peredachi Informatsii     Full-text available via subscription  
Progress in Quantum Electronics     Full-text available via subscription   (Followers: 7)
Pulse     Full-text available via subscription   (Followers: 5)
Radiophysics and Quantum Electronics     Hybrid Journal   (Followers: 2)
Recent Advances in Communications and Networking Technology     Hybrid Journal   (Followers: 3)
Recent Advances in Electrical & Electronic Engineering     Hybrid Journal   (Followers: 9)
Research & Reviews : Journal of Embedded System & Applications     Full-text available via subscription   (Followers: 5)
Security and Communication Networks     Hybrid Journal   (Followers: 2)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 53)
Semiconductors and Semimetals     Full-text available via subscription   (Followers: 1)
Sensing and Imaging : An International Journal     Hybrid Journal   (Followers: 2)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 4)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 75)
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 13)
Solid-State Electronics     Hybrid Journal   (Followers: 9)
Superconductor Science and Technology     Hybrid Journal   (Followers: 2)
Synthesis Lectures on Power Electronics     Full-text available via subscription   (Followers: 3)
Technical Report Electronics and Computer Engineering     Open Access  
TELE     Open Access  
Telematique     Open Access  
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)     Open Access   (Followers: 9)
Universal Journal of Electrical and Electronic Engineering     Open Access   (Followers: 6)
Visión Electrónica : algo más que un estado sólido     Open Access   (Followers: 1)
Wireless and Mobile Technologies     Open Access   (Followers: 6)
Wireless Power Transfer     Full-text available via subscription   (Followers: 4)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 11)
Електротехніка і Електромеханіка     Open Access  

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Journal Cover
IET Microwaves, Antennas & Propagation
Journal Prestige (SJR): 0.565
Citation Impact (citeScore): 2
Number of Followers: 35  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1751-8725 - ISSN (Online) 1751-8733
Published by IET Homepage  [42 journals]
  • Wideband RCS reduction using three different implementations of AMC
    • Authors: Bahare Zaki;Zaker-Hossein Firouzeh;Abolgasem Zeidaabadi-Nezhad;Mojtaba Maddahali;
      Pages: 533 - 540
      Abstract: Here, two new AMC structures are presented with $180^circ pm 37^circ $180°±37° phase difference in wideband frequency of 4.97–17.15 GHz. Three implementations of two AMC structures are presented, which include periodic checkerboard structure, aperiodic checkerboard structure, and randomised structure. The periodic checkerboard structure is presented in two models. In the first model, the RCS is reduced> 9.6 dB in the frequency range of 9.3–16.9 GHz, which is equivalent to 58.02%. In the second model, the RCS is reduced>7.8 dB in the frequency range of 8.1–16.9 GHz, which is equivalent to 70.4%. The second model is analysed through FMB parameter, bistatic and monostatic RCS. For improving the RCS reduction bandwidth, the new aperiodic checkerboard structure and the optimal randomised structure are presented with bandwidth of 81.67 and 98.69%, respectively. In aperiodic and randomised structure, the reflected field is scattered more uniformly in many direction. Therefore, the 3D bistatic RCS pattern is improved greatly. For validating the result of simulation, the second model of periodic checkerboard structure is fabricated and RCS reduction is measured, which are in good agreement with simulation results.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Combined L–S-bands antenna module
    • Authors: Igor Ivanchenko;Maksym Khruslov;Nina Popenko;Daniel Rönnow;
      Pages: 541 - 545
      Abstract: A combined L–S-band antenna module consists of four rectangular patch antennas, two of which operate at the frequencies of the first harmonics (L-band), and two others at the frequencies of the second harmonics (S-band). The module is intended for use in super heterodyne signal reception circuits, for example in studying the various non-linear phenomena. The results of this study are presented in terms of improving the performance of each antenna and minimising their mutual influence. The resonance frequencies of the L-band antenna differ by 50 MHz. All the antennas radiate close to the zenith and their beamwidths in two principal planes are virtually the same. At the resonance frequencies, the reflection coefficient is S11 
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Optimum design of double ridge horn antennas with general cross-section
    • Authors: Homayoon Oraizi;Amrollah Amini;Amirhosein Shakoori;Mehdi Karimimehr;
      Pages: 546 - 553
      Abstract: In this study, an analytical method is proposed for design of double-ridged horn (DRH) antenna, which is based on impedance matching of the structure by the method of least squares (MLSs). New basis functions are used for the MLS to obtain optimum impedance functions for the realisation of maximum matching. The resultant reflection coefficients are compared with available methods. The proposed optimum synthesis method is applicable to the arbitrarily tapered DRH antenna with a general cross-section. As two applications, the proposed method is used for the design of linear and non-linear flares of DRH antennas with rectangular and elliptical cross-sections for operation in the frequency band 2–18 GHz. For the proof of concept, a prototype model of the proposed rectangular horn antenna is fabricated and measured in the frequency domain.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Design of miniaturised frequency selective rasorber using parallel LC
    • Authors: Wen Jiang;Kunzhe Zhang;Bo Zhao;Yao Su;Shuxi Gong;
      Pages: 554 - 558
      Abstract: This study describes a method for designing miniaturised frequency selective rasorbers (FSRs) with a transmission band located between two adjacent absorption bands. The proposed FSR composes of a bandpass frequency selective surface at the bottom and an absorptive surface (APS) with lumped resistors and parallel LC resonators printed on the top. The absorptive surface is a 2.5-dimensional geometry for the purpose of miniaturisation. The mounted parallel LC resonators mounted in the APS are utilised to implement the transmission characteristics of the proposed FSR while the constructed lumped resistors in the APS are used to realise the absorption performance. A prototype is fabricated and measured in an anechoic chamber under the guidance of a free-space measurement system to verify this method. Experiments show that the proposed FSR has a transmission band at the centre frequency of 7.24 GHz and over the bands from 4.85 to 6.82 GHz and from 8.05 to 9.36 GHz, both reflection and transmission coefficients are less than −10 dB. The performances of the proposed FSR with different incident angles and polarisations are also investigated and results show that it is insensitive to electromagnetic wave polarisations and has a stable performance when the incident angles up to 45°.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • SIW bandpass filters in modified box-section scheme with
           bypass/constant/frequency-dependent coupling in diagonal cross-coupling
    • Authors: Qing Liu;Dong-Fang Zhou;De-Wei Zhang;Da-Long Lv;
      Pages: 559 - 566
      Abstract: Here, three fourth-order bandpass filters (BPFs) in modified box-section schemes using substrate integrated waveguide (SIW) are proposed and researched. The proposed filters are based on a conventional box-section structure with considering bypass/constant/frequency-dependent coupling (FDC) in the diagonal cross-coupling path to construct new filtering responses. Based on the different type of the cross-coupling path, the frequency response of each proposed structure is analysed and presented, which indicates that the proposed filters have flexible response in terms of finite transmission zeros (FTZs). The proposed filters can realise generalised Chebyshev responses with one/two/three FTZs at arbitrary positions. Moreover, one FTZ may be produced by using bypass coupling and direct inductive coupling window to improve lower stopband performance, which is verified by a coupling matrix. For the demonstration, three quasi-elliptic response filters were designed, fabricated, and measured. Good agreement is achieved between simulated and measured results.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Through-line method for transmission/reflection estimation of N-way
           multiport power-combining network
    • Authors: Hiromitsu Uchida;Masao Nakashima;Seiichi Handa;Takehiko Sagara;Ken-ichi Hariu;
      Pages: 567 - 573
      Abstract: A transmission/reflection estimation method based on ‘through-line’ measurements is proposed for N-way tree-shaped power-combining network, mainly used as an output impedance-matching network of a multi-transistor-cell power amplifier (PA). The method can be applied when all the N branches can be seen identical to each other and are excited uniformly in-phase, and especially useful when the input impedance of the network has a non-resistive (reactance) component. In the proposed method, a pair of the N-way networks is connected directly in a back-to-back manner (‘through’ configuration) and with transmission lines in-between (‘line’ configuration), and their S-parameters are measured. The transmission/reflection coefficients of single N-way network can be estimated from the measured ‘through’ and ‘line’ S-parameters, where in the latter the electromagnetic coupling between the transmission lines should be dealt with carefully to avoid estimation error.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Ultra-wideband high-gain dipole antenna evolved from hexagonal Sierpinski
           grid fractal gasket
    • Authors: Daotie Li;Zhonglin Wu;Jun-Fa Mao;
      Pages: 574 - 583
      Abstract: Ultra-wideband high-gain dipole antennas are urgently desired for mobile communications. A novel fractal-evolved dipole called modified hexagonal Sierpinski grid carpet dipole, of which size is about 1.5λ in upper band is developed. With self-similarity and periodicity of fractal geometry, the dipole antenna is excellent in performances. It has an ultra-wide bandwidth and high gain, due to a so-called ‘array effect of element antenna’. It presents a gain as high as 12.7 dBi and stable unidirectional radiation patterns within band of 2.0–3.93 GHz (BW = 65.1%). In addition, the dipole also has good cross-polarisation differentiation, high efficiency, high front-to-back-ratio, small size, low-profile (0.156λL), and light weight. A prototype was fabricated from a plastic body by 3D printing technology and then electroplated on the surface. Then, the sample was measured and compared with simulation results, and good agreements are obtained between them. So, correctness and validity of the design methodology are verified successfully. Due to these remarkable advantages, the fractal antenna is attractive to many radio services, such as mobile communications, defence and military, public security, aeronautics and aerospace, and so on.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Bandwidth enhanced dual-band patch-coupling microstrip antenna with
           omnidirectional CP and unidirectional CP characteristics
    • Authors: Wenquan Cao;Xinmeng Lv;Zhiyuan Zeng;Jun Jin;Han Liu;
      Pages: 584 - 590
      Abstract: Patch-coupling method is adopted to broaden the bandwidth of one dual-band dual-mode dual-circular polarisation (DBDMDCP) circular microstrip antenna in this paper. The function of dual-band dual-mode (DBDM) is excited by simplified metamaterial structure. Curved branches loaded on the ground plane and slots perturbation of radiating patches are used to excite the circular polarisation (CP) property for both n = 0 omnidirectional mode and n = 1 mode unidirectional mode, respectively. By loading four parasitical coplanar coupling patches on the top surface, the impedance of the patch mode is obviously broadened. Furthermore, methods of coplanar coupling and cascade coupling with circular patches are both adopted to broaden the axial ratio (AR) bandwidth maintaining the impedance matching condition. Considering the processing precision, the cascade coupling type is finally fabricated and compared with the probe-fed type for verification. Measurement results show that impedance bandwidths of 4% (centered at 4.52 GHz) and 17% (centered at 5.89 GHz) with maximum gain of 1.0 dBic and 7.1 dBic are realised for the dipole mode and patch mode, respectively. Furthermore, the 3 dB axial ratio (AR) bandwidth of the patch mode is 9.2% (520 MHz centered at 5.66 GHz). Compared with the former designs, this one owns simpler structure, considerable bandwidth besides of pattern and polarisation diversity.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Tunable channelised bandstop passive filter using reconfigurable phase
    • Authors: Raafat Lababidi;Maryam Al Shami;Marc Le Roy;Denis Le Jeune;Khaled Khoder;André Pérennec;
      Pages: 591 - 596
      Abstract: A novel tunable channelised two-branches passive bandstop filter using a reconfigurable parallel-coupled-line-based phase shifter (PS) is presented. The filter topology uses the signal destructive principle and aims to protect the receiver against an unwanted interference signal received by the antenna. The global filter topology contains two branches, each of which has a different function. The bandpass tunable branch selects the frequency to be rejected while the reconfigurable PS plays the signal inverter role. The simultaneous tunabilities of both bandpass and PS branches are ensured by using identical varactor diodes and features 550–700 MHz tuning range. In addition to having a constant and relatively high rejection level over all the tuning range and low insertion loss in the passband area, the filter guaranties ultra-low power consumption. Moreover, synthesis equations are proposed and used to illustrate the operating principle, and finally validated by comparing simulations results to measurements.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • DSS modulator using the SIDO dc−dc converter for the CMOS RF PA
           integrated circuit
    • Authors: Sungjae Oh;Jongseok Bae;Hansik Oh;Wonseob Lim;Youngoo Yang;
      Pages: 597 - 601
      Abstract: A dynamic supply switching (DSS) modulator using a single-inductor dual-output (SIDO) dc−dc converter for complimentary metal-oxide semiconductor (CMOS) radio frequency (RF) power amplifier (PA) integrated circuits is presented. The DSS modulator consists of the SIDO dc−dc converter and a supply switching circuit (SSC). The SIDO dc−dc converter requires only one off-chip inductor while generating two of the dc voltages. The SSC dynamically switches the high and low dc voltages according to the modulated signal envelope. The supply switching control voltage, which is generated from the envelope, is optimised for maximum efficiency improvement. The proposed DSS PA using the SIDO dc−dc converter and the SSC was fabricated using a 0.18 μm CMOS process for a 1.75 GHz frequency band and a long-term evolution (LTE) application. For the LTE 16-QAM signal with the peak-to-average power ratio (PAPR) of 7.5 dB, the measured efficiency of the DSS PA is 33.8% at the average output power of 21 dBm, thereby satisfying the adjacent channel leakage power ratio (ACLR) level of −30.1 dBc. The measured efficiency of the DSS PA at an average output power of 15 dBm is 24.8%, which is higher than that of the stand-alone PA by 13.3%.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Fast surrogate-assisted frequency scaling of planar antennas with circular
    • Authors: Slawomir Koziel;Adrian Bekasiewicz;
      Pages: 602 - 607
      Abstract: In this work, the problem of computationally efficient frequency scaling (re-design) of circular polarisation antennas is addressed using surrogate-assisted techniques. The task is challenging and requires the identification of the optimum geometry parameters to enable the operation of the re-designed structure at a selected (required) centre frequency. This involves handling several performance figures such as the antenna gain, the impedance bandwidth, as well as the axial ratio bandwidth. The design technique described here involves two types of surrogate models: an inverse surrogate (utilised to find the initial design) and a forward surrogate of the structure response sensitivities, necessary to realise post-scaling design correction. The entire re-design process is fast and only requires a few full-wave electromagnetic simulations of the antenna. The proposed dimension scaling method is demonstrated using a patch antenna with circular polarisation fed through a branch-line coupler. The structure is re-designed within the operating frequency range of 4.5–6.5 GHz. Numerical results are validated experimentally.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Wideband circular patch antenna with I-shaped structure for horizontal
           omnidirectional gain enhancement
    • Authors: Ankang Liu;Ling Huang;Yilong Lu;
      Pages: 608 - 614
      Abstract: A wideband circular patch antenna with enhanced omnidirectional gains in the horizontal plane is presented. The gain enhancement over 1 GHz bandwidth is achieved by loading a low-profile ‘I-shaped’ structure (ISS) without increasing antenna's thickness. The effective refractive index of the ISS is larger, over a wide bandwidth than that of the conventional substrate with the same material. Therefore, the artificial structure behaves as a lens to refract the electromagnetic wave which is parallelly incident to the ISS and thus is able to concentrate the energy and enhance the antenna's horizontal radiation performance. In addition, the proposed antenna achieves a relative bandwidth of 19% through combining the resonant frequency for the TM01 mode and another resonant frequency excited by the coupling between the circular patch and the unit cells for verifying the wideband gain enhancement of the ISS. Both simulation and measurement results indicate that the proposed antenna achieves 0.5–2.0 dB gain increment within the operating bandwidth compared with the unloaded antenna on the same ground.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Ionospheric tomography for the study of relative X- and O-mode power over
           low- and mid-latitude ionosphere
    • Authors: Sandip Nandi;Bijoy Bandyopadhyay;Soumen Khatua;
      Pages: 615 - 622
      Abstract: Realising the importance of the ionospheric effects on low Earth orbit (LEO) satellite signals, tomographic reconstruction method has been applied to study the relative X- and O-mode power distribution at an altitude of LEO satellites over the low- and mid-latitude regions of the Earth. Eight regions of the ionosphere in Northern and Southern Hemisphere have been reconstructed tomographically based on the Ionex TEC data and direct measurement TEC data over West Bengal, India and subsequently ray tracing of very high frequency waves has been performed. Then, based on the magnetoionic theory, the relative X-mode power distribution has been investigated. Evaluation of the results and observations related to the existence of X-mode only band and narrow O-mode only band ensures the possibility of application of ionospheric tomography technique for study of relative absorption in the ionosphere. The outcome of this research will greatly assists the researchers to interpret the ionospheric effects on radio waves.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Wideband internal dipole–loop antenna with switchable and tunable
           frequency operation for ultra-high-definition television
    • Authors: Thai Van Trinh;Gyonyun Kim;Jungjin Kim;Chang Won Jung;
      Pages: 623 - 630
      Abstract: This study presents the implementation of an internal antenna for ultra-high-definition televisions (UHD TVs), which has encountered challenges such as inherently narrow impedance bandwidths, limited space, and the effect of material properties of the TV to the antenna performance. The proposed antenna consists of a pair of rectangular arms (the dipole mode), which are fed by the coaxial cable, these arms are also connected to the ground plane (the loop mode) through two shortings that excite an additional resonance mode. In addition, reconfigurable antennas also offer attractive potential solutions to solve the challenging antenna problems related to narrow bandwidth using the ability to switch and tune operation frequency. Herein, a frequency reconfigurable dipole–loop antenna which can cover the entire ultra-high-frequency band (UHF: 470–771 MHz, BW: 47.4%) is achieved using PIN diodes for switchable frequency and varactor diodes for tunable frequency. A 49-inch UHD TV is used for the practical implementation experiment. The TV bezel (ԑr = 3.5, tanδ = 0.005) is used as the substrate for the antenna design. The designed antenna for UHD TV applications achieves good impedance matching and stable radiation characteristics in the UHF band, considering S11 = − 6 dB (VSWR 3:1) as the impedance matching criterion.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Performance enhancement and signal integrity analysis of multiband MIMO
           antenna for handheld electronic devices
    • Authors: Sangeetha Subbaraj;Padmathilagam Sambandam;Malathi Kanagasabai;Mohammed Gulam Nabi Alsath;Sandeep Kumar Palaniswamy;Indhumathi Kulandhaisamy;Saffrine Kingsly;Yogeshwari Panneer Selvam;Deepa Thangarasu;
      Pages: 631 - 641
      Abstract: In this study, a multiband 8-element MIMO antenna operating at LTE 800/2300/2500 MHz, GSM 850/900/1900 MHz, UMTS, DCS, PCS, IMT, WLAN 2400 MHz, WiMAX 3500 MHz and Wi-Fi 5800 MHz is proposed for handheld devices. The proposed antenna comprises of radiating elements and novel decoupling structure to reduce the mutual coupling. To obtain multiple resonances, F-shaped monopole, C-shaped strips, L and S-shaped monopoles are integrated to form the complete radiator. The protruded ground plane with inverted π-shaped slot acts as the decoupling element. The eight elements are arranged in a certain fashion to achieve spatial and polarisation diversity. The impedance bandwidth achieved is 170, 1070, 400 and 700 MHz. The isolation is>20 dB in all the desired operating bands. The simulated peak gain and efficiency of the antenna at the four operating bands are 4.8/6.3/5.4/4.7 dBi and 75/90/80/83%, respectively. Furthermore, the envelope correlation coefficient, the apparent diversity gain and effective diversity gain are calculated and presented. The obtained measured and simulated results are in good correlation with each other.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Stable-multiband frequency reconfigurable antenna with improved radiation
           efficiency and increased number of multiband operations
    • Authors: Jayendra Kumar;Banani Basu;Fazal Ahmed Talukdar;Arnab Nandi;
      Pages: 642 - 648
      Abstract: In this study, a multiband frequency reconfigurable antenna is presented. The proposed antenna can switch among fixed GSM850/900 MHz, LTE1600/1700/1800 MHz and ISM2400 MHz bands through switchable, single, three double, and two triple band modes. The multiband operation is obtained using a spline-based radiator and two open-ended rectangular slot-resonators (RSRs). Three series configurations of PIN diode radio-frequency (RF) switches are integrated into RSRs to activate and deactivate it. The position of RSRs and RF switches is precisely optimised to obtain the desired operating bands and the input scattering parameter (S11) below −10 dB. RF switches #1–3 are turned ON and OFF to transfigure the current distributions on the radiator resulting in the frequency band-switching operation. It is shown that the integration of RSRs and PIN diode RF switches into the antenna structure degrades the radiation efficiency. To improve the radiation efficiency, the antenna is fabricated on a low dielectric constant multilayered substrate built using RT/Duroid 5880 laminates and an air gap. The increased multiband operation, good radiation efficiency, omnidirectional radiation pattern, and sufficient co-cross polarisation isolation are obtained in all operating bands. The prototype of the antenna is fabricated and fairly good agreement is seen amongst simulated and measured results.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Non-circularity coefficient estimation of the SOI for narrowband widely
           linear beamforming
    • Authors: Yougen Xu;Yulin Huang;Junfeng Liu;Zhiwen Liu;
      Pages: 649 - 659
      Abstract: In widely linear beamforming, the second-order non-circularity property exhibited by the signal-of-interest (SOI) can be exploited to improve interference and noise suppression. Assuming known SOI steering vector and spatially white noise, several algebraic schemes for estimating the SOI non-circularity coefficient are proposed in the context of narrowband widely linear beamforming without training/reference signal. These new estimators are based on signal purification, pseudoinverse, oblique projection, and pre-processed subspace separation. Simulation results are included to illustrate the performances of the proposed methods.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • 60 GHz square open-loop resonator (SOLR) based on planar Goubau line
           (PGL) technology
    • Authors: Emad Elrifai;Marjorie Grzeskowiak;Gaëlle Lissorgues;Frédérique Deshours;Christophe Bourcier;Gérard Carrer;Elodie Richalot;Odile Picon;
      Pages: 660 - 665
      Abstract: This study presents the design, fabrication, and measurement of a square open-loop resonator (SOLR) on high resistivity silicon substrate feed with a planar Goubau line (PGL), which is a very low-loss transmission line around 60 GHz fabricated through a very simple and low-cost process. Electromagnetic simulations using ANSYS high frequency structure simulator are performed for the PGL structure, in order to determine the PGL characteristics (impedance, losses and quality factor) versus the line width. The geometrical parameters of the SOLR structure are studied to observe their impact on reflection and transmission properties. An equivalent lumped element circuit is extracted from the distributed planar design to study and optimise the resonating structure using Advanced Design System. This electrical circuit response is successfully compared to the planar electromagnetic structure one, and a parametric study permits to better understand the role of the different circuit elements. Field displays lead to a better understanding of the SOLR behaviour. For measurement purpose of the fabricated structure, a coplanar waveguide-PGL transition is optimised with 0.9 dB losses. Simulation and measurement results show good performances for filter applications with 1 dB losses and small size at 60 GHz for 10% bandwidth.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • WCIP method for multiple-loop antennas around a spherical media
    • Authors: Noemen Ammar;Henri Baudrand;
      Pages: 666 - 674
      Abstract: In this study, the wave concept iterative process method is developed in a spherical coordinate system in order to investigate the characteristic of multiple-loop antennas around a multilayer sphere. The analysis method is based on the incoming and outgoing waves defined from the tangential electromagnetic fields at the interfaces of the layers. The iterative process is governed by two systems of equations linking the waves in spectral and spatial domains. The toggling between the two domains is insured by the Legendre transformation. Numerical results consider single and multiple loops (both activated and parasitic loops) around a metallic sphere coated by one or several dielectric layers. The mutual coupling and the radiation characteristic of a loop excited by two feeding sources are analysed. The influence of parasitic loops on the return loss of the activated loop is extensively investigated including the number and the position of the loops on the sphere. The coupling sensitivity between two activated feeding sources is also investigated. The presented results agree very well with the simulation and the literature.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Design of compact quad-band bandpass filter with good selectivity using
           two-/tri-section SIRs and stepped impedance inverters
    • Authors: Daotong Li;Yaqing Yu;Rongguang Song;Ming-Chun Tang;Jing Ai;Yong Liao;
      Pages: 675 - 682
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • New design of UWB-MIMO antenna with enhanced isolation and dual-band
           rejection for WiMAX and WLAN systems
    • Authors: Ahmed S. Eltrass;Nahla A. Elborae;
      Pages: 683 - 691
      Abstract: In this work, a new design of wide-band multiple-input multiple-output (MIMO) antenna with improved isolation and dual-band rejection is proposed for wireless systems operating over the entire ultra-wide-band (UWB), X-band, and Ku-band (3–18 GHz). The proposed four-element UWB-MIMO antenna is fabricated on Rogers RT/Duroid-5880 substrate with dimension of 73 × 73 × 0.79 mm3. It achieves high isolation (>20 dB) between antenna elements without using any decoupling structures. In order to prevent interference problems from nearby WiMAX (3.3–3.8 GHz) and WLAN (5.1–5.8 GHz) systems, a C-shaped stub is embedded in the radiating patch and a pair of U-shaped parasitic strips is inserted beside the feed line in the single element design. The effectiveness of the proposed design is demonstrated by investigating measurement and simulation results, and comparing them with other existing designs. The results show that the proposed design has an input reflection coefficient
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Compact cross-coupled filters based on isosceles right triangular and
           equilateral triangular SIW cavities
    • Authors: Senshen Deng;Feng Xu;Peng Chu;Ke Wu;
      Pages: 692 - 698
      Abstract: Two kinds of classical triangular metric resonant cavities including the isosceles right triangular and equilateral triangular metric cavities are investigated carefully. A comprehensive and rigorous derivation process of these two resonant cavities is proposed. Based on this, the mode function and the transverse field components for the modes in the triangular substrate-integrated waveguide (SIW) cavities can be provided. Then the resonant frequency of both kinds of triangular SIW cavities can be calculated. Combined it with the coupling matrix, a fourth-degree filter implemented of isosceles right triangular SIW cavities and a sixth-degree filter formed by equilateral triangular SIW cavities are designed, fabricated and measured in detail. The measured results are in line with the simulated ones. The frequency responses of both filters show a pair of transmission zeroes at each side of the pass band due to the cross-coupling structure. It also verifies the validity of the derivation in this study. Compared with the rectangular and circular resonant ones, the construct of the triangular cavity has the advantage of much more compact. Besides, the proposed filters based on the triangular cavity also have their own advantages of low cost, good selectivity and easy integration with other planar circuits.
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Corrigendum: Axially displaced elliptical reflector antenna design with a
           switchable feeder for ultra-wide band applications
    • Pages: 699 - 699
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Corrigendum: Multi-frequency dual polarisation radiometer common aperture
           antenna feeding system
    • Pages: 700 - 700
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
  • Corrigendum: Iterative adaptive approach to interference covariance matrix
           reconstruction for robust adaptive beamforming
    • Pages: 701 - 701
      PubDate: 4 17 2019
      Issue No: Vol. 13, No. 5 (2019)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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Fax: +00 44 (0)131 4513327
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