一种结构紧凑的八木-宇田圆极化天线  

A Compact UHF Yagi-Uda Circular-Polarized Antenna

作　　者：华昌洲 李荣正 陆云龙[1] 

机构地区：[1]宁波大学信息科学与工程学院

出　　处：《微波学报》2018年第1期47-51,共5页Journal of Microwaves

基　　金：国家自然科学基金青年科学基金(61501274);浙江省重中之重学科开放基金(xkxl1504);宁波市自然科学基金(2016A610059,2016A610087)

摘　　要：基于八木-宇田概念提出了一种使用多节印刷方环谐振器的紧凑型圆极化天线。该天线一共有8节（节与节之间有空气隔开）：1个反射器,1个激励振子和6个引向器。局部接地的开槽贴片耦合器集成在激励振子的方环谐振器内部,以激励环形谐振器的2个正交线极化基模,从而实现圆极化辐射。为了获得高定向性圆极化辐射方向图,采用印刷在底部介质板上的折叠方环作为反射器,并将6个方环作为引向器放置在激励振子的顶部。设计、加工并测试了一个工作在440 MHz的原型天线,测试结果与仿真结果表现出良好的一致性。由于开槽贴片耦合器和折叠方环反射器的小型化,使该天线的横向尺寸仅为约λ0/4×λ0/4。A compact circular-polarized （CP） antenna using multi-seeliun printed square-ring resonators is proposed based on the Yagi-Uda concept. The antenna consists of eight sections separated by air gaps： a reflector, a driven element, and six direetors. A local-grounded slotted-patch coupler is integrated inside the square-ring resonator of the driven element to excite two orthogonally linearly polarized fundamental modes of the ring resonator, leading to a CP radiation. To obtain a high directional CP radiation pattern, a meandered square ring printed on the bottom substrate is used as a reflector, and six square rings are placed on the top of the driven element as directors. A prototype antenna operating at 440 MHz is designed, fabricated, and measured, and the measured results show a good agreement with the simulated ones. Owing to the miniaturized slotted-patch coupler and the meandered square-ring reflector, the transverse size of the antenna is only about λ0/4 × λ0/4.

关 键 词：圆极化 贴片耦合器 环形振子 八木-宇田天线 

分 类 号：TN821.1[电子电信—信息与通信工程]