反射面天线体制星载SAR波导和电缆混合电路一体化设计

Hybrid Circuit Design for Waveguide and Cable of the Passive Reflector Antenna's Spaceborne SAR System

为保证电缆和波导多通道混合电路系统的相位一致性,研究了相位配平方法和波导及电缆长度的计算方法。首先,根据矩形波导的相速度、相波长、群速度等基本特性,分析了波导电路的相位和时延特性,并提出了宽带信号在波导电路中平均时延的理论计算方法,以及根据平均时延精确计算波导电长度的理论基础。然后,给出了反射面天线体制星载SAR的发射链路构架,并根据系统链路构架,提出了一种基于平均时延的波导和电缆混合电路设计方法。最后,进行了计算机仿真设计,仿真设计结果证明了该方法的有效性。

To ensure the phase congruency of the cable and waveguide nmltichannel hybrid circuit, the phase balancing method and the length calculation method of waveguide and cable are studied. Firstly, the phase and delay characteristics of the waveguide circuit are analyzed based on the fundamental characteristics of the rectangular waveguide such as phase velocity, phase wavelength and group velocity. The theoretical calculation method of the average delay of the broadband signal in the waveguide is proposed, as well the theoretical basis of exactly calculating the electric length of the waveguide according to the average delay-. Then the transmitting link structure is presented of the passive reflector antenna＇s spaeebome SAR system, and a design method of the hybrid circuit including waveguide and cable based on average delay- is proposed. Finally, the computer simulation design is conducted, and the simulation results confirm the validity- of the proposed method.