介绍了基于光实时延迟线、基于外差混频技术和基于矢量和技术的光子射频移相器，对其工作原理和技术特点作了分析。
Photonic RF phase shifters based on OTTD (optical true time delay), heterodyne mixing technique and vector sum technique were introduced. The principles and features were proposed and analyzed.
从 PSK调制器20输出的连续波在延迟电路26I和延迟电路26Q中被延迟， 然后作为参考信号提供给接收混频器30的每个混频器。
The continuous wave output from the PSK modulator 20 is delayed in delay circuits 26I and 26Q and is then supplied, as a reference signal, to each of mixers of a receiving mixer 30.
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