Issa Mohamed

Antipodal Fermi Tapered Slot Antenna for 60-GHz Band Applications

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 antennas 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 dielectric. The diamond-shaped slot modified antenna maintains a measured gain of 20 dB with return loss better than 22 dB over the entire band. The overall efficiency is 93%. Good agreement between simulated and measured results is obtained.

Dielectric loaded antipodal linearly tapered slot antenna for 60 GHz applications

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 is 94%. Rectangular corrugation is employed to improve the radiation pattern. The ALTSA and the feed system all have been designed on a single layer substrate, resulting in a low-cost compact antenna which is suitable for 60 GHz wireless applications.

High-gain SIW-based antipodal linearly tapered slot antenna for 60-GHz applications

A substrate integrated waveguide (SIW)-fed antipodal linear tapered slot antenna (ALTSA) with tapered microstrip-to-SIW transition for millimeter-wave (MMW) applications are presented. The antenna gain is 14.7 ± 0.5 dBi over the band of interest (50-70 GHz), while a radiation efficiency of 95% is achieved. Rectangular corrugation is added to the antenna, resulting in very low cross-polarization levels and relatively low sidelobe levels. The SIW, ALTSA and transition all designed in a single layer substrate. The given design parameters are obtained using both CST and HFSS simulators.

Aperture-coupled 2×2 microstrip antenna array for 60 GHz applications

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 gain of 12.4 dB at 60 GHz, and 3 GHz 2:1 VSWR impedance bandwidth with about 90 % total efficiency. These characteristics make this antenna suitable for short-range high-speed wireless communications.

A 50-70 GHz SIW-Based Linearly Tapered Slot Antenna with Low Cross Polarization

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 exhibits symmetric radiation pattern with cross-polarization and side lobe level (SLL) of -22 and -21 dB, respectively. The overall antenna efficiency is 94%. The design approach is validated by comparing CST MWS and Ansys HFSS simulation results which clearly exhibits good agreement.

A 60 GHz SIW-based Vivaldi antenna with improved radiation patterns

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 radiation pattern is observed over the band of interest. A good agreement between Ansys HFSS and measured results is obtained. The proposed antenna is suitable for high data rate wireless applications.

Linearly tapered slot antenna array with SIW feed network for 60 GHz applications

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 87 %. The antenna array has a cross polarization level of -22 dB. The proposed array is suitable for 60 GHz short range wireless communications.

High-gain dielectric-loaded antipodal Fermi tapered slot antenna for MM-wave applications

A high gain antipodal Fermi tapered slot antenna with sine corrugation is loaded with a dielectric for potential use in high data-rate wireless applications. The proposed antenna achieved a gain of 20 dB over the unlicensed millimeter-wave ISM-band, from 57 to 64 GHz. For the frequency range of 50-70 GHz, the total efficiency is around 93% and the simulated |S11| is less than -18 dB. To reduce costs and to simplify fabrication, the elliptical-shaped loaded dielectric and the proposed antenna are integrated in a single layer substrate.