一种宽频高增益的Ku波段微带天线设计

Design of a Broadband and High Gain Microstrip Antenna at Ku Band

微带天线的固有窄带特性是限制其受到广泛应用的重要原因之一。运用寄生单元和引入空气间隙等技术,设计了一种适合Ku波段的宽频带高增益天线。微带天线的设计采用新颖的椭圆寄生贴片,同时引入空气层,这样不仅降低了微带天线的Q值,还达到增加微带天线带宽的目的;同时半椭圆寄生单元的引入也进一步提高了天线的增益。仿真及测试结果表明,天线回波损耗小于-10dB的相对带宽达到23.7%,同时带内增益基本大于8dB。

The narrow bandwidth property of the microstrip antenna is one of the important reason to restrict its wide application. In order to enlarge bandwidth, Elliptic parasitic element and the air gap between the patches are used, which not only reduces the value of Q to increase the bandwidth, but also can improve the gain due to the introduction of elliptic parasitic element. A prototype has been designed and tested. The measured results show that the antenna has an impedance bandwidth of 23.7% （S11 〈-10）and the gain is about greater than 8dB. Good agreement between simulation and experimental result shows the design is proper and useful.