Dielectric Cavity Filter Cross-Coupling Structure With External Tuning
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Solution Overview
Problem
Conventional dielectric cavity filters with cross-coupling functions require extensive disassembly and the use of multiple materials to adjust coupling coefficients, making them time-consuming, costly, and difficult to adapt to varying resonant frequency requirements.
Innovation Solution
A cross-coupling structure for dielectric cavity filters featuring a base with side through holes and blind holes, allowing a tuner to be adjusted externally to control the cross-coupling amount, simplifying the process and reducing material complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conventional flight rod assembly structure is used to realize cross-coupling, then the coupling coefficient can be adjusted, but the entire filter must be disassembled to replace the internal flight rod assembly, consuming much time and effort
Solution Approach 1:
The patent divides the cross-coupling adjustment mechanism into a separate, accessible segment. The tuning rod is made as an independent component that can be adjusted through openings on the filter housing, allowing modification of the cross-coupling structure without disassembling the entire filter assembly.
Solution Approach 2:
The patent enables the operator to perform cross-coupling adjustments directly on the assembled filter through externally accessible openings. The tuning rod can be manually extended or retracted through the housing openings, allowing the system to serve itself without requiring external disassembly or specialized service intervention.
2Adaptability or versatility
If the flight rod assembly with composite materials is used, then the cross-coupling function can be achieved, but it is necessary to prepare a variety of different materials, having a negative impact on the overall process and cost control
Solution Approach 1:
The patent makes the tuning rod serve multiple functions: it provides the necessary cross-coupling adjustment capability while being accessible for operation, and it can be made from a single material type that satisfies both mechanical and electrical requirements, eliminating the need for separate composite material preparation.
Solution Approach 2:
The patent simplifies material requirements by using a homogeneous material for the tuning rod rather than composite materials. This single material approach reduces manufacturing complexity while maintaining the necessary electrical and mechanical properties for cross-coupling adjustment.
3Adaptability or versatility
If the conventional flight rod assembly is used, then the cross-coupling effect can be realized, but the structure is complex and requires too many different types of materials
Solution Approach 1:
The patent extracts the essential cross-coupling adjustment function from the complex flight rod assembly structure. By using a simple tuning rod that can be extended or retracted through openings in the housing, the invention removes unnecessary structural complexity while retaining the core cross-coupling effect.
Solution Approach 2:
Instead of having the tuning mechanism inside the filter requiring disassembly for access, the patent inverts the access approach by providing openings in the housing that allow direct external access to the tuning rod, simplifying the overall structure and operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy and efficient adjustment of cross-coupling amounts without disassembly, reducing material needs and manufacturing costs while maintaining high reliability and signal quality.
Implementation Method 1
a plurality of resonant cavities and a plurality of dielectric resonators corresponding to plurality of resonant cavities respectively to produce multi-level coupling when electromagnetic waves pass through the resonant cavities
Data Source
AI summary
A cross-coupling structure for dielectric cavity filters includes a base and a tuner. The base is communicated with plural resonant cavities, a side through hole and a blind hole, and has a first channel formed between two adjacent resonant cavities which are not used for producing cross-coupling, and a second channel the resonant cavities formed between two adjacent resonant cavities which are used for producing cross-coupling. The side through hole is penetrated through the base and communicated with the second channel. The blind hole is formed on a wall of the second channel and has an opening facing the side through hole. The tuner is entered into the second channel from the side through hole and extended into the blind hole and can be adjustably moved between the opening of the blind hole and the bottom of the blind hole to set a cross-coupling amount target value.