Apparatus for restraining waveguide filter parasitic passband

Abstract

The invention discloses a device for inhibiting a parasitic passband of a waveguide filter in the technical fields of radar and microwave communication. The device comprises a resonance cavity waveguide filter, a single-port apparatus, a first probe, a second probe, a first terminal reflection board, a second terminal reflection board, a first narrow-side wall and a second narrow-side wall; wherein, the middle shaft of the single-port apparatus is consistent with the middle shaft of the resonance cavity waveguide filter; a hole the size of which is the same as that of the port of the single-port apparatus is arranged on the first terminal reflection board at one end of the resonance cavity waveguide filter; one end of the single-port apparatus is communalized with the resonance cavity waveguide filter by the hole; the other end of the single-port apparatus is provided with an arc reflection board; the first probe is arranged at one end of the resonance cavity waveguide filter near a high-pass waveguide; and the second probe is arranged at one end of the resonance cavity waveguide filter near a second terminal reflection board. The device not only can be used for inhibiting the outer harmonic wave of an even band, but also can be used for inhibiting the outer harmonic wave of an odd band. Besides, the device is high in commonality and is simple in structure.

Description

technical field [0001] The invention relates to a method in the technical field of radar and microwave communication, in particular to a device for suppressing the parasitic passband of a waveguide filter. Background technique [0002] The waveguide filter is generally composed of multiple resonant cavities in the middle and coupling structures at both ends. It has the characteristics of simple structure, easy design and implementation, so it is widely used in the microwave field. However, since the resonant cavity has multiple resonance characteristics, in the frequency response of the filter, except for the center frequency ω 0 In addition to the working passband, there are also ω 0 At frequencies related to the waveguide wavelength corresponding to integral multiples of the waveguide wavelength, there is a parasitic passband, that is, a higher harmonic. In practical applications, it is often necessary to adopt some methods to suppress these harmonics in order to obtain ...

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Problems solved by technology

This method requires an external source to stimulate and maintain the plasma. Although the plasma has excellent frequency selectivity and adjustability, coupled with the development of plasma generation technology, its implementation technology is relatively complicated, and there are problems that require an external plasma excitation source. insufficient

[0006] The coupling structure of the filter in the prior art can only partially suppress the out-of-band even-order harmonics, but cannot suppress the odd-order harmonics.

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