E-surface superconducting diaphragm millimeter wave waveguide filter

Abstract

The invention provides an E-surface superconducting diaphragm millimeter wave waveguide filter which aims to overcome the defects that in an existing E-surface diaphragm millimeter wave filter structure, when E-surfaces are inserted among resonant cavities, the machining difficulty is large, it is difficult to fix the specific position, superconducting substrates are prone to breaking and the difficulty in filter assembling is large. Two or more superconducting diaphragms are fixed to rectangular waveguide central E-surfaces, and the superconducting diaphragms are coupled to rectangular waveguides to form resonant cavities; adjacent superconducting diaphragms are distributed at unequal intervals, and the adjacent superconducting diaphragms are coplanar in the length direction of the rectangular waveguides; the rectangular waveguides are formed by relatively fixing two waveguides with the sections being in a right-angled U shape, and the connection faces of the right-angled-U-shaped waveguides are the central E-surfaces of the formed rectangular waveguides for fixing the superconducting diaphragms; the coupling coefficients of the resonant cavities can be adjusted by adjusting the width of the superconducting diaphragms; the central frequency of the filter can be changed by changing the size of the rectangular waveguides. The E-surface superconducting diaphragm millimeter wave waveguide filter has the advantages that the insertion loss is small, the out-band suppression degree is high, and the rectangular waveguide structure is easy to assemble.

Description

technical field [0001] The invention belongs to the technical field of millimeter-wave waveguide filtering, relates to a millimeter-wave waveguide filter, in particular to a millimeter-wave waveguide filter whose E surface is a superconducting diaphragm. Background technique [0002] Millimeter waves are more and more widely used in the fields of radar communication, satellite communication and navigation, and filters, as an important part of millimeter wave receivers, also play a pivotal role, and their filtering performance is an important factor affecting receiver performance. one of the factors. Existing millimeter-wave filters mainly include waveguide filters and planar circuit filters. However, since the millimeter wave has the characteristics of high frequency band (short wavelength) and other characteristics, the loss caused by its propagation on the common substrate is relatively large, so the planar circuit filter is almost not used. [0003] At present, waveguid...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the insertion of the E plane between the resonant cavities of the existing E-film sheet millimeter-wave filter structure is difficult to process, the specific position is difficult to fix, and superconducting substrates (such as magnesium oxide substrates and lanthanum aluminate substrates) chip) is easy to break and the assembly of the filter is difficult, etc., a millimeter-wave waveguide filter with an E-plane superconducting diaphragm is proposed

Images