Design of a Low Profile Omnidirectional Circular Polarized Reconfigurable Antenna for Beidou Application

2018 IEEE International Conference on Computational Electromagnetics (ICCEM) Pub Date : 2018-03-26 DOI:10.1109/COMPEM.2018.8496559

Dan Tang, X. Kong, Shaobin Liu

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引用次数: 2

Abstract

A low profile omnidirectional circular polarized reconfigurable antenna for Beidou application is proposed in this paper. This antenna is based on the first-order resonance mode of epsilon negative transmission line. To form a circularly polarized wave in the far field, the vertical and horizontal polarization is generated by a parallel circular cavity and three dual arc arms, respectively. Only 6 PIN diodes are needed to alter the left-handed circularly polarized (LHCP) or righthanded circularly polarized (RHCP) omnidirectional radiation state. Three-dimensional electromagnetic simulation software Ansoft HFSS and RF circuit simulation software Agilent ADS are used for co-simulation and optimization. It is shown that the proposed antenna can meet the Beidou navigation BDS-l S band requirement well whether at the left or right circularly polarized state. The omnidirectional average axial ratio at two states are 1.24 dB and 1.25 dB with 16.7 % and 19.8 % 3 dB axial ratio bandwidth, respectively. The thickness of antenna is only 2 mm (0.016 λ0) and simply processed without a dual feeding structure and 90 phase shifter.

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北斗低轮廓全向圆极化可重构天线设计

提出了一种适用于北斗系统的低姿态全向圆极化可重构天线。该天线基于负传输线的一阶谐振模式。为了在远场形成圆极化波，垂直和水平极化分别由一个平行的圆腔和三个双弧臂产生。改变左圆极化(LHCP)或右圆极化(RHCP)全向辐射状态只需要6个PIN二极管。采用三维电磁仿真软件Ansoft HFSS和射频电路仿真软件Agilent ADS进行联合仿真和优化。实验结果表明，无论在左圆极化状态还是右圆极化状态下，所设计的天线都能很好地满足北斗导航北斗系统的波段要求。两种状态下的全向平均轴比分别为1.24 dB和1.25 dB，轴比带宽分别为16.7%和19.8%。天线厚度仅为2mm (0.016 λ0)，加工简单，没有双馈结构和90移相器。

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2018 IEEE International Conference on Computational Electromagnetics (ICCEM)

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