基于左手传输线的波束扫描微带漏波天线

Microstrip Leakey-wave Antenna for Beam Scanning Based on Left-handed Transmission Line

为了进一步提高天线波束扫描技术,该文基于复合左右手传输线理论设计了波束可扫描的微带漏波天线。探讨了漏波天线的辐射特性,实现了随频率变化时天线波束在半空间内从后向到前向连续扫描的功能;运用Ansoft Designer软件进行仿真,在频扫天线单元的基础上加载不同电容实现了固定频率下天线波束的扫描。测试结果显示,漏波天线工作于3.60 GHz,加载1.0 pF电容的微带天线后向辐射,波束指向-50°;加载1.4 pF电容的微带天线前向辐射,波束指向32°。仿真结果与测试结果吻合,实现了一种低成本的波束扫描天线。

To further increase the antenna beam scanning technology, a microstrip leakey-wave antenna for beam scanning is designed using the complex right/left hand transmission （CRLH） line theory. The radiation characteristics are studied. The antenna beam continuously scans from backward to forward within half space with varying frequencies. The software Ansoft Designer is used to simulate and the antenna beam scanning is achieved in a fixed frequency by loading different capacitors on the basis of frequency-scanning antenna units. The test results show：when the leakey- wave antenna works at 3.60 GHz, the microstrip antenna beam of the afterward radiation leads to -50 by loading 1.0 pF capacitor;the mierostrip antenna beam of the forward radiation leads to 32 by loading 1.4 pF capacitor. The simulation results are consistent with the test results, realizing a beam-scanning antenna with low cost.