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Journal of Antennas 2025
一种紧凑型双频段横电磁波线性源馈电网络设计方法
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Abstract:
针对卫星通信天线小型化、高增益、口径复用的需求，设计一种工作在Ku (12.25~12.75 GHz)、Ka (19.6~21.2 GHz)的新型双频段横电磁波线性源馈电网络。网络包含：采用级联E-T结构的波导功分器，对比H-T结构缩短了横向尺寸；含有直角结构扭波导的模式转换器，扭波导长度仅为四分之一波长，且对比现有锐、钝角结构更易加工；将两频段生成的线性源组合的双工器，实现天线辐射体的单端口双频激励。仿真结果显示，Ku/Ka频段反射系数均优于？22 dB，传输系数分别优于？0.18 dB、？0.1 dB，隔离度分别优于？36 dB、？40 dB，合成波电场幅度波动范围分别为±1.5 dB、±0.8 dB，相位波动范围分别为±10 ？、±8？。新型双频馈电网络幅度波动为双平行板馈电系统的15%，避免了能量的锥削分布；横向尺寸约为H-T馈电网络的50%，实现了结构的紧凑设计。
In response to the requirements of miniaturization, high gain, and aperture reuse of satellite communication antennas, a novel dual-band transverse electromagnetic wave linear source feeding network working in Ku (12.25~12.75 GHz) and Ka (19.6~21.2 GHz) bands is designed. The feeding network consists: a waveguide power divider that adopts a cascaded E-T structure that is shorter in the H-T lateral dimension; a mode converter containing a right twist waveguide that is easier to manufacture than acute or obtuse angle structures and is only one quarter of a wavelength in length; a duplexer that combines two sources generated in two frequency bands to achieve single-port dual-frequency excitation of an antenna radiator. The simulation results show that the reflection coefficients in the Ku/Ka frequency bands are better than ？22 dB, the transmission coefficients are better than ？0.18 dB and ？0.1 dB respectively, the isolation levels are better than ？36 dB and ？40 dB respectively, the amplitude fluctuation range of the synthesized wave electric field is ±1.5 dB and ±0.8 dB respectively, and the phase fluctuation range is ±10？ and ±8？ respectively. The amplitude fluctuation of the novel dual-frequency feed network without tapering is 15% of that of the dual parallel-plate feed system; its compact lateral size is approximately 50% of that of the H-T feed network.
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