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Publisher: Springer-Verlag   (Total: 2345 journals)

 Applied Physics A   [SJR: 0.535]   [H-I: 121]   [7 followers]  Follow         Hybrid journal (It can contain Open Access articles)    ISSN (Print) 0947-8396 - ISSN (Online) 1432-0630    Published by Springer-Verlag  [2345 journals]
• Isotopic enrichment of Zn particles by laser ablation
• Authors: Marcelo N. Felix Pozzi; Gonzalo Guidali; Mauricio Fernández; Erica Zubillaga; Carlos A. Rinaldi
Abstract: The use of Zn in nuclear reactors reduces the amount of 60Co generated as a consequence of the natural activation of Co. On the other hand, isotopically enriched Zn can be used as a tracer in biological systems. At the present, the enrichment of Zn is obtained using gaseous compounds of the metal by centrifugal force. In this paper, we present a method based on laser ablation of metallic targets of Zn with a Nd–YAG nanosecond laser to produce isotopically enriched Zn particles. Also, the effect of the wavelength irradiation laser on the enrichment factor was studied and a procedure is proposed to collect the different enrichment fractions yield.
PubDate: 2017-06-22
DOI: 10.1007/s00339-017-1097-9
Issue No: Vol. 123, No. 7 (2017)

• Welding of glasses in optical and partial-optical contact via focal
position adjustment of femtosecond-laser pulses at moderately high
repetition rate
• Authors: Hua Tan; Ji’an Duan
Abstract: We used 1030-nm femtosecond-laser pulses focused above/at/below the interface of two fused-silica glass substrates in optical and partial-optical contact to successfully weld them at a moderately high repetition rate of 600 kHz. Variation in the laser focal position for these two gap-distance regimes (optical and partial-optical contact) yields different bonding strengths (BSs) and machining mechanisms. The maximum bonding strength (58.2 MPa) can be achieved for a gap distance $${\le}\lambda /4$$ for optical-contact welding when laser focused below the interface, and the corresponding height of the welding seam was 23 μm. In addition, our results demonstrated that the “filamentation welding technique” is critical to the femtosecond-laser direct welding of glasses. Furthermore, line welding is significantly easier to realize when the femtosecond laser focuses at the interface in partial-optical-contact welding applications due to the combined effects of filamentation welding and ablation.
PubDate: 2017-06-20
DOI: 10.1007/s00339-017-1079-y
Issue No: Vol. 123, No. 7 (2017)

• Enhancement of the physical properties of novel (1− x ) NiFe 2 O 4 + ( x
) Al 2 O 3 nanocomposite
• Authors: S. F. Mansour; M. A. Ahmed; S. I. El-Dek; M. A. Abdo; H. H. Kora
Abstract: NiFe2O4, Al2O3 and their nanocomposites; (1−x) NiFe2O4 + (x) Al2O3, 0.0 ≤ x ≤ 1; were synthesized using the citrate–nitrate technique. The crystal structure was examined by X-ray diffraction, the microstructure was observed by transmission electron microscopy. The Curie temperature T C grows until reaching more than 1100 K with increasing alumina content (x), while the saturation magnetization (M s) decreased. The large improvement of room temperature resistivity which achieved two orders of magnitude from x = 0 to x = 70% was interpreted from the fact that the NiFe2O4 grains become electrically isolated and the conduction path is broken by the insulating Al2O3 nanoparticulates in the composite. The electrical properties of the nanocomposite could thus be tuned easily by adjusting the Al2O3 ratio to realize the targeted value of losses and resistivity at any temperature and frequency.
PubDate: 2017-06-20
DOI: 10.1007/s00339-017-1084-1
Issue No: Vol. 123, No. 7 (2017)

• Tunable magnetocaloric effect in Sr 1 − x Ca x Mn 0.5 Ti
0.5 O 3 perovskites
• Authors: K. Shanmugapriya; D. Mohan Radheep; Balan Palanivel; Ramaswamy Murugan
Abstract: Sr1 − x Ca x Mn0.5Ti0.5O3 (x = 0.25, 0.5 and 0.75) polycrystalline samples were synthesized by conventional solid-state reaction. Magnetic characterizations of Sr1 − x Ca x Mn0.5Ti0.5O3 revealed signature of antiferromagnetic ordering at temperatures (T N) ~19, 25 and 29.5 K for x = 0.25, x = 0.5 and for x = 0.75, respectively. Sr1 − x Ca x Mn0.5Ti0.5O3 (x = 0.75) exhibits field-induced antiferromagnetic to ferromagnetic transition at ~30 K with applied magnetic field of 4 and 5 T. Magnetocaloric change (ΔS M) increases from 3.5 to 19 J/kg K by increasing calcium concentration in the A-site. Those ΔS M values are relatively very high in these classes of antiferromagnetic perovskite systems and equal to the magnetisation values of the ferromagnetic perovskite manganites. This is the first report for the Sr1 − x Ca x Mn0.5Ti0.5O3 (x = 0.75) having large magnetic entropy changes induced by the low magnetic field.
PubDate: 2017-06-20
DOI: 10.1007/s00339-017-1096-x
Issue No: Vol. 123, No. 7 (2017)

• Electronically tunable microstrip bandstop filters using a varactor-loaded
open ring resonator (VLORR)
• Authors: Juan Hinojosa; Adrián Saura-Ródenas; Alejandro Alvarez-Melcon; Félix L. Martínez-Viviente
Abstract: A compact microstrip bandstop filter (BSF) with a wide electronically tunable frequency range and a constant absolute bandwidth is presented. It consists of an open ring resonator (ORR) loaded with a varactor diode and connected to a section of a microstrip transmission line. As a reverse bias is applied to the proposed varactor-loaded ORR (VLORR), the value of the resulting capacitor is controlled and the resonant frequency can be varied to the desired position. The measured tunable BSF achieves 92.6 $$\,\%$$ tuning range with a constant 15 dB absolute bandwidth of 0.27 GHz and a minimum rejection level of 37 dB. This reconfigurable microstrip BSF can be useful in microwave communication systems.
PubDate: 2017-06-20
DOI: 10.1007/s00339-017-1094-z
Issue No: Vol. 123, No. 7 (2017)

• Crystallization kinetics and optical properties of titanium–lithium
tetraborate glass containing europium oxide
• Authors: E. A. Mohamed; A. Ratep; E. K. Abdel-Khalek; I. Kashif
Abstract: The crystallization kinetics and optical properties of [60 Li2B4O7–30 TiO2–10 Eu2O3] (mol%) glass sample have been investigated. The present glass sample exhibits three crystallization exothermic peaks (T p1, T p2, and T p3) corresponding to the formation of LiBO2, Li2B4O7, and EuTiO3 phases, respectively. The presence of phase separation in the glass sample has been confirmed by scanning electron microscopic (SEM). The mean values of Avrami exponent (n = 3.1 and 4) around T p1 and T p2, indicate that the bulk crystallization with a constant number of nuclei and with an increasing number of nuclei, respectively. The values of the local activation energy as a function of the fraction of crystallization (0.1 ≤ χ ≤ 0.9) decrease for the crystallization of LiBO2 and EuTiO3 and increase for the crystallization of Li2B4O7. The values of n(χ) for T p3 and T p2 in the range (0.1 ≤ χ ≤ 0.9) and (0.1 ≤ χ ≤ 0.4), respectively, are larger than 4 indicate that the presence of anomalous in Avrami exponent. The trend of Judd–Ofelt intensity parameters (Ω2 > Ω4 > Ω6) and the bonding parameter (δ) indicate that the lower symmetry and the highest covalent nature of the bonding around Eu3+ ions.
PubDate: 2017-06-20
DOI: 10.1007/s00339-017-1090-3
Issue No: Vol. 123, No. 7 (2017)

• Electron dynamics and optical properties modulation of monolayer MoS 2 by
femtosecond laser pulse: a simulation using time-dependent density
functional theory
• Authors: Xiaoxing Su; Lan Jiang; Feng Wang; Gaoshi Su; Liangti Qu; Yongfeng Lu
Abstract: In this study, we adopted time-dependent density functional theory to investigate the optical properties of monolayer MoS2 and the effect of intense few-cycle femtosecond laser pulses on these properties. The electron dynamics of monolayer MoS2 under few-cycle and multi-cycle laser irradiation were described. The polarization direction of the laser had a marked effect on the energy absorption and electronic excitation of monolayer MoS2 because of anisotropy. Change in the polarization direction of few-cycle pulse changed the absorbed energy by a factor over 4000. Few-cycle pulse showed a higher sensitivity to the electronic property of material than multi-cycle pulse. The modulation of the dielectric properties of the material was observed on the femtosecond time scale. The negative divergence appeared in the real part of the function at low frequencies and photoinduced blue shift occurred due to Burstein-Moss effect. The irradiation of femtosecond laser caused the dielectric response within the infrared region and introduced anisotropy to the in-plane optical properties. Laser-based engineering of optical properties through controlling transient electron dynamics expands the functionality of MoS2 and has potential applications in direction-dependent optoelectronic devices.
PubDate: 2017-06-19
DOI: 10.1007/s00339-017-1077-0
Issue No: Vol. 123, No. 7 (2017)

• Microstructure and wear resistance of Ti–Cu–N composite coating
prepared via laser cladding/laser nitriding technology on Ti–6Al–4V
alloy
• Authors: Yuling Yang; Shiyin Cao; Shuai Zhang; Chuan Xu; Gaowu Qin
Abstract: Ti–Cu–N coatings with three different Cu contents on Ti–6Al–4V alloy (TC4) were obtained via laser cladding together with laser nitriding (LC/LN) technology. Phase constituents, microstructure, microhardness, and wear resistance of the coatings were investigated. The evolution of the coefficients of friction for the three coatings was measured under dry sliding conditions as a function of the revolutions until the coating failure. The results show that the coatings are mainly composed of TiN, CuTi3 and some TiO6 phases dispersed in the matrix. A good metallurgical bonding between the coating and substrate has been successfully obtained. The prepared Ti–Cu–N composite coatings almost doubly enhance the microhardness of the TC4 alloy and reduce the friction down to 1/4–1/2 of the TC4 alloy, and thus significantly improve the wear resistance. The coefficient of friction depends on the Cu content in the coating.
PubDate: 2017-06-19
DOI: 10.1007/s00339-017-1078-z
Issue No: Vol. 123, No. 7 (2017)

• Correlation between composition, morphology and optical properties of PVK:
n -ZnO:CTAB thin films
• Authors: Samir Azizi; Marwa Belhaj; Sarra Zargouni; Cherif Dridi
Abstract: In this study, we report on the effect of zinc oxide nanoparticles (n-ZnO) content and surfactant addition on the performance of poly (N-vinylcarbazole) (PVK):n-ZnO nanocomposite thin films. Morphological and optical properties of ZnO, PVK and PVK:n-ZnO:cetyltrimethyl ammonium bromide (CTAB) hybrid films were investigated by atomic force microscopy (AFM), UV–Visible spectrophotometry and photoluminescence (PL) spectroscopy. We noticed that surface morphology was very dependent on surfactant addition into inorganic and organic components and on the ZnO content in the mixture. The optical absorption spectra of PVK:n-ZnO thin films showed a red shift of the optical band gap energy. Besides, PL measurements demonstrated an interfacial charge transfer between PVK matrix and ZnO nanoparticles through the reduced PL intensity of nanocomposites compared to PVK thin films.
PubDate: 2017-06-19
DOI: 10.1007/s00339-017-1095-y
Issue No: Vol. 123, No. 7 (2017)

• Four-flux model of the light scattering in porous varnish and paint
layers: towards understanding the visual appearance of altered blanched
easel oil paintings
• Authors: Anaïs Genty-Vincent; Théo Phan Van Song; Christine Andraud; Michel Menu
Abstract: Blanching of easel oil paintings is a recurring alteration that can affect the varnish layer and also the paint layer itself, and strongly alter the visual appearance. Our examinations by field emission gun scanning electron microscopy (FEG-SEM) of altered and unaltered samples revealed the presence of spherical pores in the altered layers, with a pore size ranging from few nanometers to few micrometers. The aim of the present study is to corroborate that the visual appearance modification can be explained by light scattering theories (Mie or Rayleigh depending on the pore size of the considered layer). The four-flux model was used to resolve the radiative transfer equation (RTE) and model the light scattering in porous varnish layers as well as in porous green earth and raw umber oil paint layers. It enables to highlight that the pore size has an important impact on the visual appearance of the altered layer (color and opacity modification). The pore concentration and the thickness of the altered part affect, however, only the opacity. This work points out that the blanching of easel oil paintings is due to light scattering by the pores, which is an important result toward the proposal of adapted and durable future conservation treatments.
PubDate: 2017-06-17
DOI: 10.1007/s00339-017-1092-1
Issue No: Vol. 123, No. 7 (2017)

• Perforated ZnFe 2 O 4 /ZnO hybrid nanosheets: enhanced charge-carrier
lifetime, photocatalysis, and bacteria inactivation
• Authors: C. Karunakaran; P. Vinayagamoorthy
Abstract: Perforated ZnFe2O4/ZnO hybrid nanosheets have been synthesized by hydrothermal technique and characterized using X-ray diffractometry, Raman spectroscopy, selected area electron diffractogram, and high-resolution scanning and transmission electron microscopic techniques. Energy dispersive X-ray spectrum shows the mole percentage of ZnFe2O4 in the synthesized nanohybrid as 2.3. The magnetization curve indicates the superparamagnetic character of the synthesized hybrid nanosheets. Electron-transfer resistance of ZnFe2O4/ZnO is larger than that of ZnO nanosheets. The absorption edge of the hybrid nanosheets overlaps with that of ZnO nanosheets and the direct and also indirect bandgaps of the hybrid do not differ significantly from those of ZnO. The emission spectrum of the hybrid overlaps with that of ZnO nanosheets. The charge-carrier lifetime in the hybrid is longer than that in ZnO nanosheets. The hybrid nanosheets show larger photocatalytic activity compared to ZnO nanosheets. The bactericidal activity of the hybrid is also larger than that of ZnO.
PubDate: 2017-06-17
DOI: 10.1007/s00339-017-1086-z
Issue No: Vol. 123, No. 7 (2017)

• Simulation of Zr content in TiZrCuNi brazing filler metal for Ti6Al4V
alloy
• Authors: Xishan Yue; Zonghong Xie; Yongjuan Jing
Abstract: To optimize the Zr content in Ti-based filler metal, the covalent electron on the nearest atoms bond in unit cell (n A u–v ) with Ti-based BCC structure was calculated, in which the brazing temperature was considered due to its influence on the lattice parameter. Based on EET theory (The Empirical Electron Theory for solid and molecules), $$n_{\text{A}}^{\text{u - v}}$$ represents the strength of the unit cell with defined element composition and structure, which reflects the effect from solid solution strengthening on the strength of the unit cell. For Ti–Zr–15Cu–10Ni wt% filler metal, it kept constant as 0.3476 with Zr as 37.5∼45 wt% and decreased to 0.333 with Zr decreasing from 37.5 to 25 wt%. Finally, it increased up to 0.3406 with Zr as 2∼10 wt%. Thus, Ti-based filler metal with Zr content being 2∼10 wt% is suggested based on the simulation results. Moreover, the calculated covalent electron of n A u–v showed good agreement with the hardness of the joint by filler 37.5Zr and 10Zr. The composition of Ti–10Zr–15Cu–10Ni wt% was verified in this study with higher tensile strength of the brazing joint and uniform microstructure of the interface.
PubDate: 2017-06-17
DOI: 10.1007/s00339-017-1072-5
Issue No: Vol. 123, No. 7 (2017)

• Tuning silver ion release properties in reactively sputtered Ag/TiO x
nanocomposites
• Authors: J. Xiong; M. Z. Ghori; B. Henkel; T. Strunskus; U. Schürmann; M. Deng; L. Kienle; F. Faupel
Abstract: Silver/titania nanocomposites with strong bactericidal effects and good biocompatibility/environmental safety show a high potential for antibacterial applications. Tailoring the silver ion release is thus highly promising to optimize the antibacterial properties of such coatings and to preserve biocompatibility. Reactive sputtering is a fast and versatile method for the preparation of such Ag/TiOx nanocomposites coatings. The present work is concerned with the influence of sputter parameters on the surface morphology and silver ion release properties of reactively sputtered Ag/TiOx nanocomposites coatings showing a silver nanoparticle size distribution in the range from 1 to 20 nm. It is shown that the silver ion release rate strongly depends on the total pressure: the coatings prepared at lower pressure present a lower but long-lasting release behavior. The much denser structure produced under these conditions reduces the transport of water molecules into the coating. In addition, the influence of microstructure and thickness of titanium oxide barriers on the silver ion release were investigated intensively. Moreover, for the coatings prepared at high total pressure, it was demonstrated that stable and long-lasting silver release can be achieved by depositing a barrier with a high rate. Nanocomposites produced under these conditions show well controllable silver ion release properties for applications as antibacterial coatings.
PubDate: 2017-06-17
DOI: 10.1007/s00339-017-1088-x
Issue No: Vol. 123, No. 7 (2017)

• Transparent, flexible, and high-performance supercapacitor based on
ultrafine nickel cobaltite nanospheres
• Authors: Xinyue Liu; Jianxing Wang; Guowei Yang
Abstract: There has been growing interest in transparent and flexible electronic devices such as wrist watch, cell phone, and so on. These devices need the power sources which also have transparent and flexible features. Here, we demonstrate a transparent and flexible energy storage device with outstanding electrochemical performance, high energy density, and super-long life based on ultrafine NiCo2O4 nanospheres which are synthesized by an innovative method concerning laser ablation in liquid and hydrothermal process. The ultrafine NiCo2O4 nanospheres provide high electrochemical activity and the synthesized colloidal solution is suitable for transparent devices. The transparent and flexible device shows a high specific capacitance of 299.7 F/g at the scan rate of 1 mV/s and a long cycling life of 90.4% retention rate after 10,000 cycles at a scan rate of 10 mV/s, which is superior to that of previously reported transparent and flexible energy storage device. In addition, an optical transmittance up to 55% at the wavelength of 550 nm is obtained, and the bending test shows that the bending angle makes no difference to the specific capacitance of the device. In addition, it shows an outstanding energy density of 10.41 Wh/kg. The integrated electrochemical performances of the device are good based on NiCo2O4 nanospheres. These findings make the ultrafine NiCo2O4 nanospheres being promising electrode materials for transparent and flexible energy storage devices.
PubDate: 2017-06-15
DOI: 10.1007/s00339-017-1085-0
Issue No: Vol. 123, No. 7 (2017)

• Enhancement in visible light photocatalytic activity by embedding Cu
nanoparticles over CuS/MCM-41 nanocomposite
Abstract: This article indicate the biogenic synthesis of copper nanoparticles (Cu NPs) using the borage flowers extract of Borago officinalis over CuS/MCM-41 nanocomposite (NC). No external reducing was utilized in the developed method. The CuS-MCM-41 NC was used as stabilizing agent. The synthesis of CuS nanostructure in MCM-41 material has been realized by hydrothermal method. Their physiochemical properties have been characterized by X-ray diffraction, transmission electron microscopy (TEM), UV–Visible diffuse reflectance spectroscopy, and Fourier transform infrared spectroscopy. On the basis of TEM images, a layer of Cu NPs has been located over CuS/MCM-41 NC with average diameter of 60–80 nm. The results revealed the spherical nature of the prepared Cu NPs with diameter less than 10 nm. The DR spectra of Cu NPs in MCM-41 and CuS-MCM-41 NCs showed surface plasmon resonance bands at 570 and 500–600 nm, respectively. The photocatalytic activity was evaluated under visible light irradiation using the photocatalytic degradation of methylene blue (MB) as a model reaction. The prepared Cu/CuS/MCM-41 nanocomposite microspheres showed higher photodegradation ability for MB than CuS/MCM-41. The degradation of MB achieved up to 80% after 60 min and the nanocomposite could be recycled and reused.
PubDate: 2017-06-10
DOI: 10.1007/s00339-017-1080-5
Issue No: Vol. 123, No. 7 (2017)

• Active carbon electrode fabricated via large-scale coating-transfer
process for high-performance supercapacitor
• Authors: Hui Guo; Zheng Liu; Hengyue Li; Han Wu; Chujun Zhang; Junliang Yang; Xiaohua Chen
Abstract: Electrodes play important roles on the performance of supercapacitors, and low-cost, large-scale fabrication of high-performance electrodes is closely related to the actual application of supercapacitors. Herein, a low-cost, large-scale coating-transfer method was developed to fabricate high-performance carbon electrodes with excellent homogeneity, high conductivity, and large surface area. Symmetric button supercapacitors using active carbon as the electrode material fabricated via coating-transfer process exhibit good specific capacitance up to 211 F g−1 at 0.1 A g−1 in 1 M neutral aqueous electrolyte, which shows 40% improvement as compared with convention rolling process. Furthermore, these supercapacitors present high repeatability and excellent performance stability. The research demonstrates that the low-cost, large-scale coating-transfer process shows great potentials in practical application for fabricating high-performance supercapacitors.
PubDate: 2017-06-08
DOI: 10.1007/s00339-017-1069-0
Issue No: Vol. 123, No. 7 (2017)

• Erratum to: Non-uniform shrinkage of multiple-walled carbon nanotubes
under in situ electron beam irradiation
• Authors: Lunxiong Li; Jiangbin Su; Xianfang Zhu
PubDate: 2017-06-07
DOI: 10.1007/s00339-017-1076-1
Issue No: Vol. 123, No. 7 (2017)

• A study on low sintering-temperature (1 −  x )(0.98(Bi 0.5 (Na 0.78 K
0.22 ) 0.5 TiO 3 ) − 0.02CuO) −  x CoFe 2 O 4 particulate
composites
• Authors: Le Thi Mai Oanh; Nguyen Van Minh; Chang Won Ahn; Aman Ullah; Ill Won Kim
Abstract: Low sintering-temperature lead-free particulate composites of (1 − x)(0.98(Bi0.5(Na0.78 K0.22)0.5TiO3 − 0.02CuO) − (x)CoFe2O4(x = 0–0.15) were synthesized by a combination of sol–gel and solid-state sintering methods. Structural, morphological, ferroelectric, and ferromagnetic properties of the composites were systematically investigated using different techniques. XRD results and FE-SEM images indicated the formation of single phase for parent matrix and the development of two component phases in all composites without any impurities. With increasing CoFe2O4 (CFO) content, P–E loops displayed a gradual increase in the coercive field (E c). The ferroelectric properties of BNKTC were significantly reduced with increasing CFO content, evidenced by a slight decrease in saturated polarization (P s), and a sharp reduction in normalized strain (S max/E max) and piezoelectric constant (d 33). Conversely, M-H loops showed a remarkable improvement in ferromagnetism with increasing CFO content, which is a good sign for searching multiferroic composites.
PubDate: 2017-06-06
DOI: 10.1007/s00339-017-1071-6
Issue No: Vol. 123, No. 7 (2017)

• Growth of γ-alumina thin films by pulsed laser deposition and plasma
diagnostic
• Authors: K. Yahiaoui; S. Abdelli-Messaci; S. Messaoud Aberkane; M. Siad; A. Kellou
Abstract: The present work discusses about the synthesis of alumina thin films, which have applications in current and next-generation solid-state electronic devices due to their attractive properties. Alumina thin films were synthesized by pulsed laser deposition at different oxygen pressures and substrate temperatures. The dependence of substrate temperature, oxygen pressure, and the deposition time on the properties of the films has been observed by growing three series of alumina thin films on Si (100). The first films are synthesized using substrate temperatures ranging from room temperature to 780 °C at 0.01 mbar of O2. The second series was realized at a fixed substrate temperature of 760 °C and varied oxygen pressure (from 0.005 to 0.05 mbar). The third set of series was elaborated at different deposition times (from 15 to 60 min) while the oxygen pressure and the substrate temperature were fixed at 0.01 mbar and 760 °C, respectively. The films were characterized using X-ray diffractometer (XRD) for structural analysis, a scanning electron microscope for morphological analysis, a nano-indenter for mechanical analysis (hardness and Young’s modulus), and Rutherford backscattering spectroscopy for thickness and stoichiometry measurements. Using optical emission spectroscopy, plasma diagnostic was carried out both in the vacuum and in the presence of oxygen with a pressure ranging from 0.01 to 0.05 mbar. Several neutral, ionic, and molecular species were identified such as Al, Al+, and Al++ in vacuum and in oxygen ambiance, O and AlO molecular bands in oxygen-ambient atmosphere. The spatiotemporal evolution of the most relevant species was achieved and their velocities were estimated. The highest amount of crystallized alumina in γ-phase was found in the films elaborated under 0.01 mbar of O2, at a substrate temperature of 780 °C, and a deposition time of 60 min.
PubDate: 2017-06-05
DOI: 10.1007/s00339-017-1074-3
Issue No: Vol. 123, No. 7 (2017)

• Novel fabry-pérot cavity antenna with enhanced beam steering property
using reconfigurable meta-surface
• Authors: Peng Xie; Guangming Wang; Tong Cai; Haipeng Li; Jiangang Liang
Abstract: Fabry-Pérot cavity (FPC) antenna is essential and widely used in communication system. However, conventional Fabry-Pérot cavity antennas suffer from limited working modes, small beam steering range, and also complex configurations. Here, we propose a novel reconfigurable meta-surface to extend the working modes of the FPC antenna, and thus enhanced beam steering angles (−54° to 54°). The reconfigurable meta-surface consists of 6 × 6 unit cells, occupying an area of 90 mm × 90 mm. The well-designed bias circuits can control the reflection phase of the meta-surface by tuning the states of the inserted PIN diodes, which results in 11 radiation directions of our FPC antenna. For experimental demonstration, we fabricate and assemble an antenna sample working at 5 GHz. Numerical and experimental results coincide well with each other, indicating enhanced radiation properties and wide applications of our FPC antenna.
PubDate: 2017-06-05
DOI: 10.1007/s00339-017-1060-9
Issue No: Vol. 123, No. 7 (2017)

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