https://iopscience.iop.org/article/10.1088/1757-899X/557/1/012018/pdf

High Gain of Directional Ultra-Wideband Array Antenna Using Flat Reflector Structure for Microwave Imaging

A W-band compact Dual Reflector Cassegrain antenna with high gain, pencil beam and good sidelobe level has been designed using High Frequency Structure Simulator (HFSS) IE software. The proposed antenna consist of a Main reflector, Sub reflector and a Feed all together joined with a support structure made of Aluminum. Simulated and Experimental measured results for various antenna parameters show a very good agreement. Effect of support structure has also been studied and optimized to minimize the effect on electrical properties of the antenna.

A W-band Compact Dual Reflector Cassegrain antenna for Monopulse Tracking Radar

UWB array antenna with the high enhancement of gain is proposed. New additional flat reflector with a distance of 20 mm enhances the proposed antenna gain. UWB antenna performance with reflector is better than UWB antenna without reflector structure. Antenna with reflector recorded wider operating bandwidth; 1.9GHz-10.6GHz with higher gain ranged from 3.5dB until 14.2dB compared with without reflector antenna operated from 2.2GHz to 10.6GHz with lower gain ranges of 1.9dB to 9.8dB. The reflector structure enhanced the antenna gain by 50% where the average gain throughout operating frequency for an antenna with reflector and antenna without a reflector is 10.2dB and 6.8dB respectively.

High Enhancement of Unidirectional UWB Array Antenna’s Gain Using Flat Reflector Structure for Microwave Applications

A dual-reflector antenna in millimeter wave frequency band is designed at center frequency of 35 GHz. The designed antenna has small size, low weight, fast beam scanning, high efficiency and high gain. Beam rotation of the proposed structure makes it useful for wide angle scanning in modern airborne radar systems. In the literature, beam rotation of similar structures used to be evaluated by two times of the twist-reflector rotation. For the first time, a nonlinear relationship is found between beam rotation and twist-reflector rotation. This nonlinear relation is theoretically extracted in this work. Furthermore, the designed antenna is simulated with a commercial full wave package. The results confirm that the designed goals are addressed. Moreover, the simulation results validate the extracted analytic relationship between beam rotation and twistreflector rotation. In addition, low VSWR, low crosspolarization and good radiation pattern are observed.

Analysis of Dual-Reflector Antenna for Radar Applications

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Analysis of Dual-Reflector Antenna for Radar Applications