X-frequency-band super-high-power absorption type harmonic filter

The present invention discloses an X-frequency-band super-high-power absorption type harmonic filter which comprises an upper wave guide cavity and a lower wave guide cavity. The upper wave guide cavity and a lower wave guide cavity are buckled to form a main wave guide cavity with a rectangular section; wave guide flanges are respectively mounted on two lateral surfaces of the main wave guide cavity; and middle cavities with the completely same shape and size and cover boards with the completely same shape and size are respectively, sequentially and fixedly arranged outside the upper wave guide cavity and a lower wave guide cavity from inside to outside. According to the X-frequency-band super-high-power absorption type harmonic filter, by forming twelve auxiliary wave guide cavities with gradually varied sizes, simultaneous inhibition on first, second, third and fourth harmonic waves is implemented, the second harmonic wave inhibition degree is greater than 70dB, the third harmonic wave inhibition degree is greater than 60dB, and the fourth harmonic wave inhibition degree is greater than 40dB, so that interference to a receiving channel is greatly reduced; a structure of loading the auxiliary wave guide cavities by coupling holes is adopted, insertion loss of the filter is smaller than 0.2dB, and a band-pass standing wave ratio is smaller than 1.1, power capacity of the filter is greatly improved, and the X-frequency-band super-high-power absorption type harmonic filter can be widely applied to various fields of high-power filtering.