| CPC H01P 1/202 (2013.01) [H01Q 5/47 (2015.01)] | 17 Claims |

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1. A coaxial filter, comprising a housing, a cover plate, and a resonator, wherein the housing has a resonant cavity, the cover plate corresponds to the resonant cavity and covers the housing, the resonator comprises a plurality of elastic pieces, a body portion and a connection portion which are sequentially connected from one end to another end of the resonator, the connection portion is connected to a bottom of the resonant cavity, the plurality of elastic pieces are evenly spaced apart along a circumferential direction of the body portion, and a respective operation hole corresponding to each of the plurality of elastic pieces is disposed on the cover plate.
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