Wide-stopband waveguide band-pass filter with loading inductance diaphragms and capacitance diaphragms loaded in staggered mode

Abstract

The invention discloses a wide-stopband waveguide band-pass filter with loading inductance diaphragms and capacitance diaphragms loaded in a staggered mode, and belongs to the technical field of microwaves. The waveguide band-pass filter comprises a rectangular waveguide, wherein N pairs of inductive diaphragms are arranged in the rectangular waveguide in the axial direction, and a pair of capacitive diaphragms is arranged between every two adjacent pairs of inductive diaphragms. Based on the design theory of the Chebyshev filter and the capacitance loading shortening theory of the resonant cavity of the transmission line, the wide-stopband waveguide band-pass filter adopts the out-of-band transmission pole control technology of the staggering resonator to finally achieve the miniaturization and wide-stopband suppression waveguide band-pass filter.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to a waveguide band-pass filter loaded with miniaturized inductance diaphragms and capacitive diaphragms interleavedly with a wide stop band. Background technique [0002] The waveguide bandpass filter has the advantages of large power capacity and low insertion loss, and is widely used in microwave relay communication, radar, communication and other systems. However, the volume of the bandpass filter cavity formed by the waveguide transmission line is relatively large, and the conventional bandpass structure design does not have wide stopband suppression characteristics, which is limited in wide stopband applications. In addition, spaceborne space microwave systems require waveguide filters while maintaining high power capacity. [0003] The traditional wide stopband technology approaches include: adding a suitable transmission zero point to the filter; adopting an evanescent mod...

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Problems solved by technology

The above schemes have improved the wide stopband characteristics of the filter, but they cannot meet the requirements of miniaturization of the filter

[0004] On the other hand, traditional methods such as high-dielectric constant dielectric filling and capacitor columns are used to effectively reduce the length of the resonator in the filter through capacitive structural loading, so as to achieve the purpose of reducing the filter volume, but this uneven loading technology cannot Realize the wide stopband characteristic of the filter, and the stopband suppression can only reach 2 times the frequency at most

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