Cavity filter is a kind of filter based on the principle of resonant cavity, which utilizes the intrinsic frequency of the resonant cavity at different frequencies for signal filtering. The resonant cavity consists of a capacitor and an inductor. When the frequency of the input signal is the same as the intrinsic frequency of the resonant cavity, the resonant cavity will show a resonance state, at which time the capacitor and the inductor will show peaks and pass the signal out, constituting the band-pass filter part of the filter. When the frequency of the signal is not equal to the intrinsic frequency of the cavity, the inverse resonance of the capacitance and inductance produces a high impedance state, and the signal is not easy to pass through, constituting the attenuation filter part of the filter.

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