Ultra wide band filter based on short circuit branches

Abstract

The invention discloses an ultra wide band filter based on short circuit branches. The ultra wide band filter comprises a transmission line inner conductor, a transmission line outer conductor, at least two short circuit branches which consist of metal columns and resonant cavities, and at least four tuning screws. The ultra wide band filter has the advantages that staggered screw are adopted to vary broadband high pass as band pass, so that the parasitic passband is farther, the out-of-band rejection is steep, and the filter is simple to process.

Description

technical field [0001] The invention relates to an ultra-wideband filter based on short-circuit stubs, in particular to an ultra-wide-band filter composed of strip lines and short-circuit stubs. The filter becomes a wideband bandpass filter. Background technique [0002] A strip line short-circuit stub filter can form a wide-band high-pass filter when the length center frequency of the short-circuit stub is 1 / 4 waveguide wavelength, and the distance between adjacent short-circuit stubs is 1 / 2 waveguide wavelength. The high-end return loss of the traditional stripline short-circuit stub high-pass filter is relatively poor. This stripline short-circuit stub type cannot make a broadband bandpass filter, making its suppression very steep. In the present invention, a broadband band-pass filter is made by using interleaving screws, so that the parasitic pass-band is relatively far away, and the out-of-band suppression is very steep. Contents of the invention [0003] The objec...

AI Technical Summary

Problems solved by technology

The high-end return loss of the traditional short-circuit stub high-pass filter is relatively poor. This type of short-circuit stub cannot make a wide-band band-pass filter, making its suppression very steep

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