一种可任意幅相调制的波导缝隙波束赋形天线

A Waveguide Slot Beamforming Antenna Able to be Modulated by Any Amplitude and Phase

为实现搜索雷达余割平方的波束赋形性能,设计了一款“几”字形波导缝隙阵列波束赋形天线。该天线采用“几”字形折叠结构和缝隙偏移以实现相位与幅度调制,实现了阵列的余割平方波束赋形。通过电磁仿真计算,最终确定了天线的最优结构参数,进行了实物加工和测试。实测结果表明,在16.4~16.6 GHz的频率范围内,该阵列天线的电压驻波比小于1.25,增益高于15.4 dBi,实测结果与仿真结果具有较好的一致性。该天线具有大功率、高增益、剖面低等特点,可作为波束赋形相控阵天线的组阵单元。提出的波导缝隙阵列赋形天线实现方式可有效减小赋形波束范围内理论值和设计值之间的差异,使波导缝隙天线波束赋形的设计不再受限于缝隙的幅度和相位控制,可适用于多种波束赋形场合的应用。

In order to realize the beamforming performance of the search radar cosecant squared,aΩ-shaped waveguide slot array beamforming antenna is designed.The antenna adopts aΩ-shaped folding structure and gap offset to achieve phase and amplitude modulation,and realizes the cosecant square beamforming of the array.Through electromagnetic simulation calculation,the optimal structural parameters of the antenna are finally determined,and the physical processing and measurement are carried out.Measured results show that in the frequency range of 16.4~16.6 GHz,the voltage standing wave ratio of the array antenna is less than 1.25,and the Gain of the array antenna is higher than 15.4 dBi,these measured results have good consistency with the simulation results.The antenna provides the characteristics of high power,high gain and low profile,can be used as a unit for beamforming array antennas.The proposed beamforming method of the waveguide slot array beamforming antenna designed in this paper reduces the difference between the theoretical value and the design value in the beamforming range,so that the design of the waveguide slot antenna beamforming is no longer limited by the amplitude and phase control of the slot.So it can be applied to a variety of beamforming occasions.