定位／通信双天线深腔共口径实验研究

Design of Positioning/Communication Dual Antennas with a Shared Aperture in a Deep Cavity

该文对载体平台上双天线共口径的可行性进行了研究,口径为带介质罩的深腔。定位天线采用四绕螺旋天线(QHA);通信天线采用以腔壁为地的水平单极振子。对QHA天线在腔内的应用提出了利用腔底与末端水平支节进行调谐的改进。通过理论分析和实验考察了腔体对天线及两副天线之间的影响。结果表明这种方案中的两副天线能够同时在腔内很好地工作,相互的耦合还展宽了水平振子的工作带宽。

The feasibility of making two antennas work with a shared aperture on a platform is investigated. The aperture is formed by a deep cavity with a dielectric radome. A Quadrifilar Helix Antenna （QHA） is adopted for the platform positioning and a horizontal monopole using the cylindrical wall of the cavity as its ground is adopted for communication. In order to tune the QHA in the cavity, an improvement is proposed by utilizing the bottom of the cavity and the horizontal branches of the four helices. The effect of the cavity on the antennas and the interaction of the two antennas are studied through experiments. The results show that the two antennas of the overall arrangement perform simultaneously well in the cavity and the mutual coupling effect expands the bandwidth of the horizontal monopole.