低副瓣多波束Rotman透镜天线设计

设计了一个工作于Ka频段的16波束H面波导结构低副瓣多波束Rotman透镜天线。各相邻 波束间隔小于半功率波束宽度。采用相邻波束副瓣对消的原理实现了降低副瓣目的。实测结 果表明，与未采取对消的天线相比，天线副瓣电平平均降低了10 dB。给出了H面喇叭激 励下透镜内电磁场计算公式及阵列轮廓的截获损耗。螺钉移相器的应用缩小了透镜天线尺寸 。

A Low Sidelobe Rotman Lens Antenna with Multi-beam

A low sidelobe Rotman lens antenna is developed which operates at Ka band with 1 6 beams. The angular interval between beams is smaller than half power beam width .It is structured with H-plane waveguide. The sidelobe is reduced by canceling patterns of adjacent two beam ports.Test result shows that th e sidelobe is reduced about 10dB compared with no canceling measure. The formula of radiating field in the lens cavity which is made of two metal parallel plate s by the H-plane horn is given.The intercepted loss by the contour of array ports is computed. The scale of lens is reduced obviously by application of meta l posts phase s hifter.