基于新型宽带同轴的超短波双极化TCDA设计

周承冕; 岳家璇; 肖科; 丁亮; 柴舜连

doi:10.12265/j.cjors.2022177

基于新型宽带同轴的超短波双极化TCDA设计

Design of ultrashort wave dual polarization TCDA based on new broadband coaxial

摘要

摘要: 为解决在VHF和UHF频段内的紧耦合偶极子阵列（tightly coupled dipole array, TCDA）天线馈电网络设计困难，不利于工程化的问题，提出一款采用新型宽带同轴馈电的具有低剖面、双极化特点的TCDA天线设计方案. 该天线采用双偶极子单元结构，由二阶Wilkinson功分器和新型同轴宽带巴伦共同组成馈电网络，接地短路枝节抑制E面共模谐振，频率选择表面(frequency selective surface, FSS)层抑制H面扫描失配. 通过ADS-HFSS联合进行高效的电磁仿真，仿真结果表明，该TCDA在110~500 MHz内电压驻波比(voltage standing waveratio, VSWR)典型值<2，±45° VSWR典型值<2.5，剖面高度小于1/10 \lambda _\mathrml\mathrmo\mathrmw . 该天线具有剖面低、易于全金属化的特点，为超短波频段TCDA的工程实际化提供了一种可靠的方法.

Abstract: In order to solve the difficulty in designing the feed network of tightly coupled dipole array antenna (TCDA) in VHF and UHF bands, which is not conducive to engineering, we propose a design scheme of TCDA antenna with low profile and dual polar characteristics fed by a new broadband coaxial Balun. The antenna adopts a double dipole element structure. The feed network is composed of a second-order Wilkinson power divider and a new coaxial broadband Balun. The grounding short-circuit branch suppresses the common mode resonance on the E-plane, and the FSS layer suppresses the scanning mismatch on the H-plane. Through ADS-HFSS joint electromagnetic simulation, the simulation results show that the TCDA has a typical value of VSWR<2, ±45° VSWR<2.5 within 110-500 MHz, and the profile height is 265 mm, which is less than 1/10 \lambda _low . The antenna has the characteristics of low profile and easy metallization, which provides a reliable method for the engineering practice of ultrashort wave band TCDA.

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