Publisher: Cambridge University Press   (Total: 386 journals)

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 International Journal of Microwave and Wireless TechnologiesJournal Prestige (SJR): 0.184 Citation Impact (citeScore): 1Number of Followers: 10      Hybrid journal (It can contain Open Access articles) ISSN (Print) 1759-0787 - ISSN (Online) 1759-0795 Published by Cambridge University Press  [386 journals]
• MRF volume 12 issue 2 Cover and Front matter
• PubDate: 2020-03-01T00:00:00.000Z
DOI: 10.1017/S1759078720000033
Issue No: Vol. 12, No. 2 (2020)

• MRF volume 12 issue 2 Cover and Back matter
• PubDate: 2020-03-01T00:00:00.000Z
DOI: 10.1017/S1759078720000045
Issue No: Vol. 12, No. 2 (2020)

• A high selective tri-band bandpass filter with switchable passband states
• Authors: Anjan Bandyopadhyay; Pankaj Sarkar, Tapas Mondal, Rowdra Ghatak
Pages: 103 - 108
Abstract: A new class of switchable bandpass filter using PIN diodes is presented in this paper. The design aims at achieving a multistate switchable bandpass filtering characteristics between the passbands centered at 2.4, 3.5, and 5.2 GHz. The proposed filter is designed by assembling two λg/2 open-ended and four short-ended λg/4 uniform impedance resonators. The open-ended resonator generates a fixed passband at 3.5 GHz, whereas the short-ended resonators loaded with PIN diodes are independently controlling the ON and OFF characteristics of the passband centered at 2.4 and 5.2 GHz. The transmission zeros around each passband are produced without employing any additional circuit. The filter sample is fabricated and tested for experimental verification. A good agreement has been observed between EM-simulated and measured results. The designed filter has a compact size of 0.20 λg × 0.15 λg at 2.4 GHz.
PubDate: 2020-03-01T00:00:00.000Z
DOI: 10.1017/S1759078719001053
Issue No: Vol. 12, No. 2 (2020)

• Ultra-compact quasi-elliptic bandpass filter based on capacitive-loaded
eighth-mode SIW cavities
• Authors: Qing Liu; Dongfang Zhou, Dewei Zhang, Chenge Bian, Yi Zhang
Pages: 109 - 115
Abstract: This paper reports a novel fourth-order quasi-elliptic bandpass filter (BPF) based on capacitive-loaded eighth-mode substrate integrated waveguide (CLEMSIW) cavities. The CLEMSIW cavity is constructed by the conventional eighth-mode SIW with two dielectric substrates and three metal layers; a metal via is employed to connect the middle and bottom metal layers. The middle metal layer achieves a large loading capacitance to shift the resonance frequency. The proposed filter is designed in a quadruple scheme, and two controllable finite-transmission zeros can be realized. For the demonstration, a prototype with a center frequency of 1 GHz and a fractional bandwidth of 10% was designed, fabricated, and measured. The measured results agree well with simulated ones. The proposed filter has advantages of ultra-compact size, high selectivity, and good stopband performances.
PubDate: 2020-03-01T00:00:00.000Z
DOI: 10.1017/S175907871900120X
Issue No: Vol. 12, No. 2 (2020)

• Compact transition from CBCPW to substrate integrated suspended line
(SISL) for operation up to 46 GHz
• Authors: F. Parment; A. Ghiotto, T.-P. Vuong, L. Carpentier, K. Wu
Pages: 116 - 119
Abstract: A compact transition between conductor-backed coplanar waveguide (CBCPW) and substrate integrated suspended line (SISL) is presented. Compared to the reported transitions from CBCPW to SISL, performance and compactness are improved. For demonstration purpose, a multilayer transition is designed and fabricated for operation up to 46 GHz. Experimental results, based on an electronic calibration and thru–reflect–line calibration allowing measurement in the 0.01–50 GHz frequency range, demonstrate an insertion loss of 0.59 ± 0.51 dB with a return loss of better than 10 dB in the 10 MHz to 46 GHz frequency range.
PubDate: 2020-03-01T00:00:00.000Z
DOI: 10.1017/S1759078719001090
Issue No: Vol. 12, No. 2 (2020)

• Flexible biomedical RF sensors to quantify the purity of medical grade
glycerol and glucose concentrations
• Authors: N. K. Tiwari; S. P. Singh, D. Mondal, M. Jaleel Akhtar
Pages: 120 - 130
Abstract: A novel flexible radio frequency (RF) sensor is designed to facilitate the accurate testing of various samples used in the biomedical industry at the industrial, scientific and medical (ISM) frequency band. The proposed RF biosensor comprises a liquid channel-loaded interdigitated capacitor, which is integrated on a coplanar waveguide structure. The prototype of the sensor is fabricated on a 0.13 mm thin biodegradable polyethylene terephthalate polyester film to perform the testing of various bio-graded samples by recording the corresponding resonant frequency. It is observed that there is a noticeable change between the measured resonant frequencies of these samples, which primarily occurs due to the difference in their dielectric properties. The designed sensor was used to monitor and investigate the quality of glycerol, which is the most commonly used raw ingredient in the biomedical and food industry. The determination of glucose concentration in base fluids is considered to ease the challenges faced by doctors and biochemists regarding the monitoring of glucose concentration. It is found that the proposed sensor can quantify the glycerol purity up to the minimum specified adulteration level of 2 and 1% corresponding to toxic contaminants diethylene glycol and ethylene glycol, respectively, and the glucose concentration of 0.5 mg/ml.
PubDate: 2020-03-01T00:00:00.000Z
DOI: 10.1017/S1759078719001089
Issue No: Vol. 12, No. 2 (2020)

• Characteristic mode-based compact circularly polarized metasurface antenna
for in-band RCS reduction
• Authors: Puneeth Kumar Rajanna; Karthik Rudramuni, Krishnamoorthy Kandasamy
Pages: 131 - 137
Abstract: This paper presents a novel design of a low profile circularly polarized (CP) metasurface (MTS) antenna with in-band radar cross-section (RCS) reduction property. The MTS is loaded as a superstrate on slot antenna and it can be viewed as a polarization-dependent MTS (PDMTS). The rectangular patch-based PDMTS is analyzed using characteristic mode analysis to find two orthogonal degenerate modes, which produces CP waves. Linearly polarized slot antenna is used to excite the PDMTS. The performance of PDMTS loaded slot antenna is analyzed numerically using full-wave analysis method. The PDMTS CP antenna is fabricated and its performance is tested experimentally. The proposed antenna has a compact structure and it has an overall size of $0.52{\lambda _0}\times 0.52{\lambda _0} \times 0.078{\lambda _0}$ (where ${\lambda _0}$ is the free space wavelength). The measured results show that the PDMTS antenna achieves $-10\,{\rm dB}$ impedance bandwidth of 29.41 $\%$ , 3-dB axial ratio bandwidth of 9.05 $\%$ , broadside gain of 6.34 dB, and monostatic RCS reduction of $-30.2\,{\rm dBsm}$ at the resonant frequency of 5.86 GHz. The simulated results are in well agreement with the measured results and it is well suited for C-band Radar and Satellite communication.
PubDate: 2020-03-01T00:00:00.000Z
DOI: 10.1017/S1759078719001119
Issue No: Vol. 12, No. 2 (2020)

• Meta-waveguide analysis and implementation for using as a slot array
antenna
• Authors: Mahmoud Fallah; Mohammad Khalaj-Amirhosseini
Pages: 138 - 147
Abstract: This paper presents a novel concept named meta-waveguide structures to design slot array antennas based on metasurface. The proposed method investigates the geometrical parameters of the embedded metasurface and their relations to build up the engineered electric and magnetic fields to introduce efficient slot array antennas. This approach eliminates the necessity of using the well-known offsets in typical slot arrays, which can be benefited from linear array theorem. This idea is realized by employing successive filed curvature along the propagation direction, utilizing periodic metasurfaces. Thereafter, a step-by-step algorithm is recommended to design an efficient slot array antenna. Finally, a prototype is fabricated and tested experimentally validating the theoretical calculations.
PubDate: 2020-03-01T00:00:00.000Z
DOI: 10.1017/S1759078719001132
Issue No: Vol. 12, No. 2 (2020)

• A novel reconfigurable microstrip fractal UWB antenna with six variable
rejection frequency bands
• Authors: Nasrin Nemati; Mohammad Bemani
Pages: 148 - 154
Abstract: In this paper, a new reconfigurable microstrip fractal ultra-wideband antenna with a capability of variable rejection frequency bands is presented. The main patch of this antenna has two modified C-shaped gaps. Also, on these c-shaped gaps, 10 ideal MEMS switches are used to produce band-notch frequencies at six different frequencies of: 5.4 GHz (5.2–5.5), 5.8 GHz (5.7–5.9), 6.1 GHz (5.9–6.3), 7 GHz (6.9–7.2), 7.9 GHz (7.7–8.1), and 8.4 GHz (8.2–8.6). This antenna is fed by a 50 Ω microstrip line and works in a wide bandwidth of 2.9–11 GHz. The antenna is designed and fabricated on an inexpensive substrate of FR4. Dimensions of the antenna are 31.2 × 38.4 mm. Measurement and simulation results are in good agreement.
PubDate: 2020-03-01T00:00:00.000Z
DOI: 10.1017/S1759078719001028
Issue No: Vol. 12, No. 2 (2020)

• Dual-band slot microstrip patch antennas with dual-radiation modes for
wireless communication
• Authors: Guangwei Yang; Jianying Li, Jiangjun Yang, Zijian Xing
Pages: 155 - 162
Abstract: In this paper, a novel compact dual-band microstrip patch antenna with dual-radiation modes is investigated. The proposed antenna consists of a rectangular ground plane, a U-shaped feed probe, and an H-shaped slot radiating patch. By adjusting the size of these structures, a dual-band antenna can be obtained. In the low-frequency band, the antenna can radiate one radiation beam with high gain. In the high-frequency band, the antenna can achieve monopole-like radiation pattern. Therefore, an antenna prototype is fabricated and measured for validation. Good agreement between the simulated and measured results is observed in this paper. The antenna's operating frequency ranges are 3.6–3.85 GHz in the low-frequency band and 5.1–6.1 GHz in the high-frequency band with the reflection coefficient less than −10 dB. At 3.7 GHz, the antenna radiate one beam with 8.8 dBi realized gain. At 5.5 GHz, it exhibits dual-radiation beams directed to −48 and 48° with 5.6 and 5.5 dBi realized gain in the xoz-plane and −48 and 48° with 2.9 and 3.0 dBi realized gain in the yoz-plane. Therefore, the proposed antenna is a good candidate for wireless communication systems.
PubDate: 2020-03-01T00:00:00.000Z
DOI: 10.1017/S1759078719001065
Issue No: Vol. 12, No. 2 (2020)

• Pattern and frequency reconfigurable antenna with diode loaded ELC
resonator
• Authors: Ghanshyam Singh; Binod K. Kanaujia, Vijay K. Pandey, Deepak Gangwar, Sachin Kumar
Pages: 163 - 175
Abstract: In this work, a new compact, low profile, frequency, and end-fire pattern reconfigurable antenna is presented. The proposed antenna consists of four parasitic elements and an electric-inductive-capacitive (ELC) resonator enclosed with a closed ring resonator (CRR). The reconfigurability in the proposed antenna is achieved with the help of five PIN diodes (D1–D5) embedded on the top surface of the substrate. The diode (D1) is implanted between ELC and CRR resonators for frequency reconfigurability. The other four diodes (D2–D5) are implanted between the ground plane and four parasitic elements to control the electrical length of the ground plane to achieve pattern diversity. The ground plane and parasitic elements steer the primary omni-directional beam to bi-directional and uni-directional end-fire radiation at multiple frequencies. The proposed antenna exhibits multiband operation and end-fire pattern diversity depending upon the different states of PIN diodes. The overall size of the proposed antenna is 0.20λ0× 0.17λ0× 0.009λ0, where λ0 is calculated at the lowest resonance frequency. The impedance bandwidth of the antenna ranges from 1.45 to 26.22%, while peak gain varies from 0.86 to 3.86 dBi depending upon the state of operation. The measured results are in agreement with the simulated results, which confirm the frequency and pattern diversity performance of the antenna. The proposed antenna can be used in back-to-back repeater systems.
PubDate: 2020-03-01T00:00:00.000Z
DOI: 10.1017/S1759078719001077
Issue No: Vol. 12, No. 2 (2020)

• Q-slot+antenna&rft.title=International+Journal+of+Microwave+and+Wireless+Technologies&rft.issn=1759-0787&rft.date=2020&rft.volume=12&rft.spage=176&rft.epage=182&rft.aulast=Abed&rft.aufirst=Amer&rft.au=Amer+T.+Abed&rft.au=Mandeep+S.+J.+Singh,+Aqeel+M.+Jawad&rft_id=info:doi/10.1017/S1759078719001107">Investigation of circular polarization technique in        class="italic">Q-slot antenna
• Authors: Amer T. Abed; Mandeep S. J. Singh, Aqeel M. Jawad
Pages: 176 - 182
Abstract: This paper describes and analyzes a new technique used in Q-slot antenna to generate circular polarization (CP). The CP characteristics were investigated carefully by studying the surface current distribution, the phase difference between the left hand circular polarization (LHCP) and right hand circular polarization (RHCP) at some resonant frequencies, and the measured values of the axial ratio bandwidth (ARBW). Normal arms (E1 and E2) were cut in the upper elliptical feeding strip line to form an open-mouth structure. The arms E1 and E2 were made equal in length and set perpendicular to each other to have normal electric fields, leading to the generation of CP radiation. A formula was modified for the dual resonant frequencies f1, f2 of the modes TM010 and TM001. The measured values of the ARBW indicated that the antenna has a wide ARBW of 4.8–5.93 GHz, which is approximately 52% of the 3rd operating band of 4.7–6.8 GHz. The wide ARBW in a small size indicated that the design of the Q-slot antenna overcame the limits of designing antennas with wide ARBW in small size and low profile. A formula for normalized field was driven according to the complementary of the Q-slot antenna.
PubDate: 2020-03-01T00:00:00.000Z
DOI: 10.1017/S1759078719001107
Issue No: Vol. 12, No. 2 (2020)

• Meta-heuristic optimization algorithms for simultaneous optimization of
sidelobe level and directivity of uniformly excited concentric ring array
antennas
• Authors: Kailash Pati Dutta; G. K. Mahanti
Pages: 183 - 192
Abstract: This paper proposes the novel application of three meta-heuristic optimization algorithms namely crow search algorithm, moth flame optimization, and symbiotic organism search algorithm for the synthesis of uniformly excited multiple concentric ring array antennas. The objective of this work is to minimize the sidelobe level (SLL) and maximize the peak directivity simultaneously. Three different cases are demonstrated separately with various constraints such as optimal inter-element spacing and/or optimal ring radii. Comparative study of the algorithms using common parameters such as SLL, directivity, first null beam width, best cost, and run time has been reported. Investigation results prove the superiority of case 3 over other cases in terms of directivity and SLL. This work demonstrates the potential of these algorithms.
PubDate: 2020-03-01T00:00:00.000Z
DOI: 10.1017/S1759078719001120
Issue No: Vol. 12, No. 2 (2020)

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