The prominent feature of the circulator is unidirectional transmission of high-frequency signal energy, which controls the electromagnetic wave transmission in a certain direction, and is mostly used between the output end of the high-frequency power amplifier and the load, which is independent and “isolated” from each other. The load impedance does not affect the working state of the power amplifier even in the case of open or short circuit, thus protecting the power amplifier. The annular device has the characteristics of small volume, wide frequency band and small insertion loss
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