A simple planar circularly polarized antenna for GPS system

2014 International Workshop on Antenna Technology: Small Antennas, Novel EM Structures and Materials, and Applications (iWAT) Pub Date : 2014-03-04 DOI:10.1109/IWAT.2014.6958685

Y. Cao, S. Cheung, Li Liu, T. Yuk

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引用次数: 3

Abstract

The design of a planar right-handed circularly polarized (RHCP) antenna used for the Global Positioning System (GPS) is presented in this paper. The antenna consists of two meandered monopoles, a feeding network designed using the Wilkinson power divider and a defected ground structure (DGS). These two meandered monopoles resonate at about 1.575 GHz and are placed perpendicular to each other. The Wilkinson power divider divides the input signal into two signals with equal amplitude and phase. A phase difference of 90° between the signals to the monopoles is simply achieved by using a difference in length of λg/4 (λg is the guide wavelength) in the two feed lines. The DGS is used to increase isolation between the two monopoles. Measured results show that the antenna has an impedance bandwidth (for reflection coefficient S11<;-10 dB) from 1.12 to 1.85 GHz and an axial-ratio bandwidth (for axial ratio AR <; 3 dB) from 1.53 to 1.66 GHz in the GPS band. The simulated and measured S11, AR, radiation pattern, efficiency and gain are presented.

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一种用于GPS系统的简易平面圆极化天线

介绍了一种用于全球定位系统(GPS)的平面右旋圆极化天线的设计。该天线由两个弯曲单极子、一个采用威尔金森功率分压器设计的馈电网络和一个缺陷地结构(DGS)组成。这两个弯曲的单极子共振频率约为1.575 GHz，彼此垂直放置。威尔金森功率分配器将输入信号分成两个振幅和相位相等的信号。通过在两条馈线中使用λg/4的长度差(λg是波导波长)，可以简单地实现到单极子的信号之间的相位差为90°。DGS用于增加两个单极子之间的隔离。测量结果表明，该天线的阻抗带宽(反射系数S11< -10 dB)为1.12 ~ 1.85 GHz，轴比带宽(轴比AR <;3db)，从1.53 GHz到1.66 GHz。给出了模拟和测量的S11、AR、辐射方向图、效率和增益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2014 International Workshop on Antenna Technology: Small Antennas, Novel EM Structures and Materials, and Applications (iWAT)

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