| 摘要: |
| 提出了一种磁耦合激励的圆极化滤波天线。该天线采用磁耦合技术，实现了TEM模到TE10模的小型化转换，再经过矩形到圆波导的过渡，结合圆极化片的调节，获得向自由空间高效率转换的圆极化电磁波。在介质矩形波导中，引入了4个尺寸不同的耦合探针，通过对这些探针尺寸的调节，可以产生谐振和非谐振模式，获得期望的谐振频率、传输零点、滤波极点和谐振器间的耦合系数等，最终实现良好带外抑制的低频滤波天线性能。实测结果充分验证了设计的合理性。该设计思路对其他多级滤波天线也同样具有借鉴意义。 |
| 关键词: 圆极化天线 滤波天线 磁耦合 介质波导 带外抑制 |
| DOI：10.20079/j.issn.1001-893x.220406002 |
|
| 基金项目: |
|
| A circularly polarized filter antenna excited by magnetic coupling |
| TANG Xiaoyun,WANG Zhen,DING Zhuofu,XIAO Li |
| (1.The First Military Representative Office of Air Force Station in Luoyang,Luoyang 471009,China;2.Chengdu Aviation Military Representative Office of Army Air Force，Chengdu 610036,China;3.Chengdu RML Technology Co.,Ltd.,Chengdu 610213,China) |
| Abstract: |
| A compact dielectric waveguide circularly polarized filter antenna is proposed.The antenna adopts magnetic coupling technology to realize the miniaturized conversion from TEM mode to TE10 mode,and then through transition from rectangular to circular waveguide and adjustment of the circular polarization sheet,circularly polarized electromagnetic waves converted to free space with high efficiency is obtained.In the dielectric rectangular waveguide,four coupling probes with different sizes are introduced.By adjusting the size of these probes,resonant and non-resonant modes can be generated,and the desired resonant frequency,transmission zero,filter pole and inter-resonator coupling coefficient can be obtained,thus achieving low-frequency filter antenna performance with good out-of-band rejection.The measured results fully verify the rationality of the design,and the design idea also has reference significance for other multi-stage filter antennas. |
| Key words: circular polarization antenna filter antenna magnetic coupling dielectric waveguide out-of-band rejection |
