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介绍了延时线在雷达中的工作原理,分析了延迟时间误差与延迟幅度误差对信号合成的影响。针对驱动延时组件小型化、高精度设计的难点进行了评估,并提出采用微波多层印制电路实现小型化、采用新型调相电路与衰减电路解决延时高精度的设计方案。在此基础上,设计并实现了一种集成延时、放大与功率分配/合成功能的驱动延时组件。根据驱动延时组件各态收发指标测试结果,幅度带内平坦度优于±0.4 d B,延时相位精度≤±5°,延时幅度精度≤±0.5 d B。
The working principle of delay line in radar is introduced, and the influence of delay time error and delay error on signal synthesis is analyzed. Aiming at the difficulties of miniaturization and high precision design of driving delay components, the design of using microwave multi-layer printed circuit to achieve miniaturization and adopting new phase modulation circuit and attenuation circuit to solve the delay high precision is proposed. On this basis, a kind of driving delay component which integrates the functions of delay, amplification and power distribution / synthesis is designed and implemented. According to the test result of sending and receiving indicator of each state of delay component, the in-band flatness is better than ± 0.4 d B, the delay phase accuracy is less than or equal to ± 5 ° and the delay amplitude accuracy is less than or equal to ± 0.5 d B.