文中设计了一种低副瓣馈电网络。该馈电网络采用带状线多层板层压结构,在馈电网络上增加了百叶窗式缺陷地设计,通过改变缺陷地的数量改变相应端口的输出幅度和相位,使其与理论值的偏差变小,从而使得包含该馈电网络的天线阵列更容易实现低副瓣的性能。文中就百叶窗式缺陷地对馈电网络中功分器各端口幅度和相位的影响进行了分析并设计了16通道的馈电网络。通过对网络上百叶窗式缺陷地的调节,馈电网络的幅度偏差从原始的±0.45dB 降低到±0.2dB,相位偏差由±8°降低到±2.5°,天线副瓣由-24.2 dB降低到-28.1dB,满足了天线的使用要求。

A low sidelobe feed network is proposed in this paper. This network uses multilayer board laminated structure and louver defected ground structure (DGS) on the surface. The output amplitude and phase can be decided by the dimension of the DGS. It makes the measurement approach the designed parameter. Thus it is easy to realize the capability of low sidelobe. The effect of DGS on the amplitude and phase of each port of the power divider in the feed network is analyzed and a 16-channel feed network is designed. The result shows that the amplitude deviation is improved form ±0.45 dB to ±0.2 dB by changing the quantity of the louver DGS. The phase deviation is improved form ±8°to ±2.5°. The sidelobe result is improved form -24.2 dB to -28.1 dB. Thus this 16-channel feed network meets the requirements of the antenna.

TN819. 1