Abstract
ABSTRACT In this paper, an efficient feed network for small secondary surveillance radar (SSR) antennas is introduced. It integrates all three required beams (SUM, DIFF, and CTRL) into a single-sheet design. The architecture employs a side element to generate the control (CTRL) beam for a 7-element 1.5-meter SSR antenna array. The target performance includes keeping the gain above 15 dBi and a side lobe level exceeding 20 dB at 1030 MHz and 1090 MHz for the SUM port while reducing the loss of the CTRL beam. In this work, a modified Gyzel unequal power combiner replaced the conventional Wilkinson power combiner to adjust the feed network’s power-sharing. Also, a practical method for implementing a high coupling value of 7 dB in a directional coupler is presented as one of the key steps to achieve a very low loss of 2.9 dB in the CTRL path (2.4 dB improvement). Simulation and measurement results validate the proposed feed network’s performance.
Published Version
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