厚介质罩深腔内双天线共口径设计

Design of dual antennas with a shared aperture in a deep cavity covered by a thick radome

对在载体平台上带介质罩的深腔内实现双天线共口径的可行性进行了研究。四绕螺旋天线(QHA)被采用以实现载体定位;环状地板上的竖直单极振子或二元阵则用于遥测。实验研究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很好地工作,QHA天线窗口法向右旋圆极化(RHCP)辐射,遥测天线口径面掠射,同时相互的耦合还展宽了遥测天线的工作带宽。

The feasibility of making two antennas work within a shared aperture on a platform was investigated. The aperture was formed by a deep cavity with a dielectric radome. A quadrifilar helix antenna（QHA） was adopted for platform positioning and a vertical monopole or an array of two vertical monopoles on a ring shaped ground was utilized for telemetring. The effects of the cavity on the two antennas and the interaction of the two antennas were studied through experiments. The results show that the two antennas of the overall arrangement perform simultaneously well in the cavity. The QHA has a right hand circular porlarized （RHCP） pattern normal to the upside of the radome and the main lobe of the array is in the grazing direction of the aperture. Moreover, the mutual coupling effects expand the bandwidth of the array.