中文摘要：

文章设计了一款易调谐的小型圆极化微带天线，采用在方形贴片表面对角开槽的方式减小天线尺寸，利用在地板上加载2对非对称的窄槽来激发圆极化辐射波，并在地板中心处加载1个方形槽以实现易调谐特性。对制作的天线进行测试，结果表明，在全球定位系统（Global Positioning Systems, GPS）1．575GHz频点上轴比为0．55dB，圆极化带宽为17MHz，有效地克服了表面开槽对圆极化性能的影响，与传统天线相比具有易调谐、结构紧凑等特点，具有良好的工程实用性。

英文摘要：

An easy tuning compact circular polarization microstrip antenna is designed. The size of the antenna is reduced by cutting the diagonal slots on the square patch. Two pairs of asymmetric narrow slots are loaded into the ground plane for circular polarization. To achieve the performance of easy tuning, an additional square slot is loaded into the center of the ground plane. A prototype of antenna is fabricated and tested. The measured results show that the value of axial ratio is around 0.55 dB and the axial ratio bandwidth is 17 MHz at 1. 575 GHz in Global Positioning Systems（GPS）, which effectively overcomes the influence of surface slots on the performance of circular polarization. Compared with the traditional antenna, the proposed antenna has the advantages of compact structure, easy tuning and good prospects for the applications.