Search results for: Abdelrazik Sebak
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A low-cost, high gain and broadband 30 GHz quasi_Yagi antenna with a corrugated substrate is presented. The corrugation design parameters provide a high flexibility to enhance antenna characteristics. The proposed antenna provides a gain of 17.7 dB at 30 GHz, a high total radiation efficiency of ∼94.4%, an impedance bandwidth covers the 24–31.6 GHz band and in-band crosspolarization of less than 37...
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IEEE Antennas and Wireless Propagation Letters > 2017 > 16 > 752 - 755
A high-gain low-profile circularly polarized substrate integrated waveguide cavity antenna is proposed using TE 440 high-order mode. This antenna is simply excited by a coaxial probe. A linear-to-circular convertor is used in order to achieve circular polarization (CP). The low-profile, lightweight antenna offers both left- and right-hand CP. The implemented antenna exhibits a measured gain of almost...
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IEEE Antennas and Wireless Propagation Letters > 2017 > 16 > 1808 - 1811
Gain enhancement and bandwidth improvement of a 2 × 2 square dense dielectric patch antenna using a holey superstrate are proposed. This aperture-coupled antenna is fed by a conventional power divider. A dielectric superstrate layer is utilized to enhance the antenna gain. Moreover, by drilling a set of identical circular holes in the superstrate layer, the antenna bandwidth is improved, and the sidelobe...
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In this paper, a linearly tapered slot antenna (LTSA) array fed with a substrate integrated waveguide (SIW) is proposed. An SIW-based 4-way power divider with broadband and low loss properties is designed to implement a compact planar feed network. The array shows a gain of 21 dB with a return loss better than 15 dB over the band of interest (54–66 GHz). The total efficiency of the antenna array is...
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A 32.5 GHz antipodal fermi-linear tapered slot antenna (AFLTSA) 1×8 array for millimeter wave applications is presented in this paper. The substrate integrated waveguide (SIW) feeding structure is used to excite this proposed antenna. The proposed antenna has a sine corrugation to improve the radiation characteristics of the antenna. The simulated results of the single element yields a wide bandwidth...
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High gain circularly polarized substrate integrated waveguide (SIW) slotted cavity antenna is proposed using TE440 high order modes. A linear to circular polarization convertor is used in order to achieve a circular polarization (CP). The antenna has many attractive advantages such as low profile, light weight, and compact in size. Moreover, it offers both left and right hand circular polarization...
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A 60 GHz substrate integrated waveguide (SIW)-based Vivaldi antenna with low cross-polarization and side lobe levels is presented. The feed system is implemented using microstrip-to-SIW transition, SIW, and SIW-to-slot-line transition. The simulated and measured results show a nearly flat gain of 15 ±0.4 dB over the frequency range of 55–65 GHz. In addition, a good impedance matching and symmetric...
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In this paper, a beamforming technique using multimode section based on s-parameters has been analyzed for antipodal fermi-linear tapered slot antenna (AFLTSA). The analysis is proposed for 2 × 2 and 4 × 4 sub arrays on Rogers 5880 substrate with a relative dielectric permittivity εr=2.2 in order to achieve an objective of high gain and narrow beamwidth, which can be used for target tracking and precise...
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High gain low profile slotted cavity with substrate integrated waveguide (SIW) is presented using TE440 high order mode. The proposed antenna is implemented to achieve 16.4 dBi high gain at 28 GHz with high radiation efficiency of 98%. Furthermore, the proposed antenna has a good radiation pattern. Simulated results using CST and HFSS software are presented and discussed. Several advantages such as...
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A new broadside high gain H-plane SIW horn antenna is designed for future fifth generation (5G) applications. The proposed antenna is fed by substrate integrated rectangular coaxial cable. Moreover, the antenna has many advantages such as compact size, light weight, low cost, and low profile for no need to vertical plate. This antenna has a good impedance matching and achieved a high gain of 13.3...
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IET Micro & Nano Letters > 2016 > 11 > 4 > 224 - 229
A novel process has been developed for fabricating ceramic dielectric structures with dimensions applicable to W-band millimetre wave dielectric resonator antennas. The ceramic dielectric structures are based on composites of SU-8 2150 photoresist and alumina (Al2O3)-alpha nanopowder. The effects of increasing the weight percentage of Al2O3 nanopowder on the photo-polymerisation of the SU-8–Al2O3...
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Summary form only given, as follows. The complete presentation was not made available for publication as part of the conference proceedings. Recently, there has been increasing interest and rapid growth in millimeter (mm)-wave antennas and devices for use in diverse applications, services and technologies such as short-range communication, future mm-wave mobile communication for the fifth generation...
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A low cost 3-element sectorial fermi taper slot antenna configuration with sin-corrugation is designed at 28GHz. The elements can be illuminated individually based on the direction of the transmitter. In the proposed antenna structure each element produces a high gain of 15dB, a wide impedance bandwidth, a side-lobe levels less than -12.5dB, and an overall line of sight beam-width of +45 degrees....
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In this paper, a 50-70 GHz substrate integrated waveguide (SIW)-based linearly tapered slot antenna (LTSA) is proposed. An SIW-to-tapered-slot transition consists of a metallic plate of a rectangular trapezoid shape and two plated vias is used to reduce the cross-polarization level. The antenna shows a gain of 15.8±0.5 dB with return loss better than 18 dB. Over the entire band of interest, the antenna...
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We propose a hybrid antenna composed of spherical lens fed by an Antipodal Fermi tapered slot antenna (AFTSA). The AFTSA has customized multi-sin-shape corrugated patterns. The corrugation steps are used to enhance E and H- plane characteristics and reduce the return loss. The loaded methodology of the conventional semispherical is compared with new slotted full spherical lens. The model design achieved...
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A 60 GHz 2×2 planar microstrip antenna array is proposed. An aperture-coupled feeding technique with inclined rectangular slots has been used to ensure equal coupling to each radiating patch. After optimization by a CST MWS simulation tool, a prototype antenna is fabricated and measured. The results show good agreement between simulations and measurements. The proposed antenna exhibits a maximum realized...
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A novel 60 GHz circularly polarized antipodal Fermi tapered slot antenna with sin-corrugation (AFTSA-SC) is presented in this work. The tapered slot antenna is a class of endfire antennas, with radiation patterns capable of high directivity while maintaining a wide bandwidth. The circularly-polarized antenna element consists of a pair of AFTSA-SC antennas. These two AFTSA-SC antennas are aligned orthogonally...
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A loaded antipodal linear tapered slot antenna (ALTSA) with a diamond-shaped slot is presented. The feed system is implemented using a substrate integrated waveguide (SIW), tapered microstrip-to-SIW transition and a horn-shaped via. The proposed antenna exhibits a return loss better than 18 dB over the band of interest (50–70 GHz) with a gain of 16.2 dB at the center frequency. The overall efficiency...
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IET Microwaves, Antennas & Propagation > 2015 > 9 > 4 > 336 - 342
This study presents a new design of a triple band-notched ultra-wideband antenna. The designed structure of the antenna is based on two radiating strips, and a microstrip feed-line on the front, an inverted T-shaped element and a partial ground on the back. By etching a slot off the ground plane, another resonance is excited resulting in the extended bandwidth. The antenna with new structure occupies...
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IEEE Antennas and Wireless Propagation Letters > 2015 > 14 > 96 - 99
A 60-GHz antipodal Fermi tapered slot antenna (AFTSA) with sine corrugation is presented. It exhibits a flat measured gain of 18.8 dB with return loss better than 18 dB over a frequency range of 55–65 GHz. To further improve the antenna’s performance, two other shape-modified AFTSAs are presented: one with a delta-shaped slot and the other with a diamond-shaped slot and loaded with an elliptical-shaped...
