Dielectric Filter Support Structure for Low-Stress Resonator Mounting
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Solution Overview
Problem
Existing dielectric filters face issues with support structures that lead to stress concentration and deformation, affecting normal operation due to screw fixation, which compromises the stability and performance of the dielectric resonator.
Innovation Solution
A dielectric filter design featuring a resonant slot with a support portion forming an intermodulation groove, where the dielectric resonator is mounted on the support portion with adjustment holes communicating with the groove, and a tuning structure connected to a cover plate, enhancing support and reducing contact area, while using silver plating for secure welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If screw fixation is used to support the dielectric resonator, then the support structure is simple and easy to manufacture, but stress concentration occurs causing deformation and damage to the support member
Solution Approach 1:
The patent removes the screw fixation method from the support structure and replaces it with an integrated support member that is directly formed on the housing. This extraction of the problematic screw connection eliminates stress concentration while maintaining manufacturing simplicity through the integrated design.
Solution Approach 2:
The support member is merged with the housing to form an integrated structure. The support member is directly formed on the housing without separate fastening components, combining what were previously separate elements (housing and support) into a unified structure that eliminates stress concentration points.
2Device complexity
If the dielectric resonator is placed in the central position of the inner cavity, then the structure is simple, but the support member deforms and damages due to stress concentration
Solution Approach 1:
The support member is merged with the housing to form an integrated structure that maintains the central positioning simplicity while eliminating the strength issues through the unified design that distributes stress more effectively.
3Device complexity
If traditional support structures are used, then the structure is simple, but the Q value is lower and insertion loss is higher
Solution Approach 1:
The patent extracts the dielectric resonator from traditional support structures and positions it within an intermodulation groove formed by support portions on the housing. This removal from conventional supports eliminates the energy losses associated with traditional mounting methods while maintaining structural simplicity.
Data Source
AI summary
A dielectric filter includes a housing, a dielectric resonator, a cover plate, and a tuning structure. A resonant slot is disposed on the housing, a support portion is disposed in the resonant slot, and the support portion encloses to form an intermodulation groove at a slot bottom of the resonant slot. The dielectric resonator is mounted on the support portion and covers a groove opening of the intermodulation groove, multiple adjustment holes are disposed on the dielectric resonator, and the multiple adjustment holes communicate with the intermodulation groove. The cover plate is connected to the housing, covers an opening of the resonant slot, and is spaced apart from the dielectric resonator. The tuning structure is connected to the cover plate, where each of the multiple adjustment holes is configured with one tuning structure.