微带天线波束宽度可调技术研究

Research on Adjustable Technology of Microstrip Antenna Beam Width

针对现有的微波探测模块工作天线在实际应用中的适应能力有限,较差的探测稳定性等缺陷,本文提出了一种波束宽度可调的微带天线。天线的尺寸为6.8 mm×6.7 mm×1.07 mm,工作频率为10.525 GHz,天线的E面和H面半功率波束宽度为83.58°和78.66°。该天线直接放置在长形介质下方,通过调整介质与辐射贴片的距离,微带天线E面和H面半功率波束宽度分别扩展为192.5°和200.5°有明显扩展效果。可调微带天线并没有加载任何的开关和二极管,所以在最大程度上减小了系统的插入损耗,同时也没有额外的外置直流偏置电路,降低了系统的功耗。

Aiming at the defects of the existing microwave detection module working antenna, such as limited adaptability and poor detection stability in practical application, a microstrip antenna with adjustable beam width is proposed in this paper. The size of the antenna is 6.8 mm × 6.7 mm × 1.07 mm, the operating frequency is 10.525 GHz, and the half power beam widths of E plane and H plane of the antenna are 83.58° and 78.66°. The antenna is directly placed under the long medium. By adjusting the distance between the medium and the radiation patch, the half power beam width of E plane and H plane of microstrip antenna is expanded to 192.5°and 200.5° respectively, which has obvious expansion effect. The adjustable microstrip antenna does not load any switches and diodes,so the insertion loss of the system is reduced to the greatest extent. At the same time, there is no additional external DC bias circuit,which reduces the power consumption of the system.