| Citation: | XU Tongmin, YAO Minli, ZHANG Fenggan, et al. Design of low sidelobe broadband microstrip array antenna with non-uniform spacing[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(9): 1884-1891. doi: 10.13700/j.bh.1001-5965.2020.0299(in Chinese)
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To reduce the Sidelobe Level (SLL) of the antenna and widen the bandwidth, a 16-element coupled-feed microstrip array antenna with non-uniform spacing at 14.25 GHz frequency was designed. The antenna adopts a multi-layer design, and a rectangular groove is formed in the ground layer to perform coupling feeding. And the air layer is introduced to reduce the antenna Q value and increase the bandwidth. Different from the excitation amplitude weighting of uniformly spaced antennas, this paper starts from the perspective of array element spacing, differential evolution algorithm is used to reduce the SLL, and a non-uniform spacing parallel linear array antenna is constructed. The energy received by the array element is approximately replaced with the energy passing through the rectangular slot, and the power distribution of the array element is observed. And the mathematical relationship of all feeder sections of the feed network is established to ensure that all array elements are excited with equal amplitude and in phase under the condition of unequal spacing. The measurement results show that the antenna has a voltage standing wave ratio of less than 2 in the range of 14 GHz to 15.2 GHz, which satisfies the bandwidth requirements of satcom on the move. The gain is more than 16 dB and the SLL is less than -17 dB within the operating bandwidth, which shows that the performance is better than that of the array antenna with uniform spacing.
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