A microwave resonator

Abstract

A microwave resonator comprising a hollow tube comprising a plurality of electrically conductive wall faces which together define a tube wall defining a tube bore, the tube extending along a length axis from a first end to a second end; the tube wall having an N fold rotational symmetry about the length axis wherein 2<N<10; a first electrically conductive covering plate covering the first end of the tube; a second electrically conductive covering plate covering the second end of the tube; a dielectric puck comprising first and second end faces and a side wall extending therebetween, the puck being dimensioned such that when in the tube bore its dominant resonant mode is a doubly degenerate mode; the puck being arranged in the tube bore spaced apart from the covering plates with its end faces normal to the length axis and centered on the length axis; the puck being spaced apart from the tube wall by a plurality N of electrically conductive spacer blocks, the spacer blocks being spaced equally around the length axis and spaced apart from the covering plates; and, a symmetry breaking structure adapted to modify the coupling between the two degenerate modes and also their relative frequencies.

Description

technical field [0001] The present invention relates to microwave resonators. More particularly, but not exclusively, the present invention relates to a microwave resonator comprising a hollow tube having a bore defined by conductive tube walls, the tube having caps covering both ends plate and has N-fold rotational symmetry about a length axis extending along the length of the tube; a dielectric disc, which is arranged in the tube bore, the disc is dimensioned such that when the disc is in the tube bore , whose dominant resonant mode is a doubly degenerate dominant mode, the disk is spaced from the tube wall by a plurality of N spacer blocks; and a symmetry-breaking structure adapted to modify the two degenerate modes The coupling between and their relative frequencies. In another aspect of the present invention, there is provided a microwave resonator comprising: a hollow tube having a tube hole defined by conductive tube walls, the tube having a cover plate covering both ...

AI Technical Summary

Problems solved by technology

A problem with known dielectric dual-mode microwave resonators is that the frequency of the first spurious mode may be close to the dominant (lowest frequency) mode

This can negatively impact the performance of filters and multiplexers employing such resonators

It can also make the fabrication of filters and multiplexers using such microwave resonators more complex and expensive since spurious modes must be filtered out

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