一种宽频带圆极化微带贴片天线设计

Design of Broadband Circularly Polarized Microstrip Patch Antennas

利用双馈点法设计了一个覆盖GPS和GLONASS频段(1570MHz^1620MHz)的宽频带圆极化微带贴片天线。与传统单馈点圆极化贴片天线相比较,这类天线将辐射贴片与馈电网络集成在一起,可获得令人满意的阻抗及轴比带宽。在1.575GHz和1.610GHz时的实测天顶方向轴比均小于1.5dB,增益均大于4dB。该天线性能较好,加工调试简便,在卫星导航等领域具有广阔的应用前景。

A design of broadband circularly polarized microstrip patch antenna is proposed in this paper. This antenna is fed by two quadrature probes placed symmetrically on the two main axis to cover the band of GPS and GLONASS （1570MHz～1620MHz）. Compared with traditional circularly polarized patch fed by one probe, good impedance bandwidth and 3dB axial ratio bandwidth are achieved by integrating radiate patch with feeding network in this antenna. Through testing, the zenithal axial ratios on the frequency of 1. 575GHz and 1. 610GHz are respectively less than 1.5dB, and the gain on the two frequencies both exceed 4dB. The antenna has good performance, and adjustment is easy. Such a circularly polarized patch antenna can be used extensively in satellite navigation.