为了能对射频信号进行连续相位调制, 设计了Ka波段新型小型化的模拟电调移相器, 该电路基于90°分支线电桥与并联结构变容二极管实现电路大范围移相, 利用四分之一波长微带线实现电路匹配及阻抗变换, 通过并联补偿电阻平衡其插入损耗波动, 并对其进行了详细分析与探讨。仿真及实测结果表明: 该移相器在29~31 GHz频段范围内, 可获得180°左右的相移量, 插入损耗优于6.5 dB, 插入损耗波动在1 dB内, 相移误差小于10°。

In order to modulate the phase of RF signal continuously, a new miniaturized Ka-band analog electrically controlled phase shifter is presented. The phase shifter based on 90° directional coupler and parallel variable capacitance diodes(VCD) achieves matching circuits and shift phase, and the circuit can gain wide range of phase shift by changing the bias voltage of variable capacitance diodes(VCD). At the same time, insertion loss fluctuations have a significant improvement by parallel compensation resistance. Simulation and experimental results show that the phase shifter obtains 180° phase shift, the insertion loss is less than 6.5 dB, the insertion loss fluctuations are within 1 dB, and the phase shift errors are less than 10° in 29-31 GHz range.