Sheet Resonator Filter Structure for Compact Frequency Tuning
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Solution Overview
Problem
Cavity filters face challenges in miniaturization, high production costs, and complex assembly, making them difficult to produce and automate due to the limitations of cylindrical resonator rods and intricate assembly relationships.
Innovation Solution
A resonant filter design featuring a housing with input and output resonators as metal sheets, allowing for capacitive coupling without a physical capacitive structure, and a simplified structure that includes an isolation plate and adjustable tabs for frequency tuning, facilitating miniaturization and automated production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a cavity filter with cylindrical resonator rod is used, then the resonant frequency can be controlled, but the device size cannot be reduced and manufacturing cost increases
Solution Approach 1:
The patent changes the fundamental parameter of the resonator from a three-dimensional cylindrical rod to a two-dimensional sheet structure. This parameter change in geometry allows the resonator to achieve the same resonant frequency control while occupying significantly less volume, directly resolving the contradiction between frequency control precision and device size.
Solution Approach 2:
The patent uses metal sheets with patterned conductive structures that replicate the resonant functionality of traditional cylindrical rods. The sheet-based resonators copy the essential electromagnetic resonant properties while adopting a planar form factor that enables miniaturization and reduces manufacturing complexity.
2Measurement precision
If a cavity filter with cylindrical resonator rod is used, then the resonant frequency can be controlled, but the manufacturing cost increases
Solution Approach 1:
The patent transforms the resonator from a complex three-dimensional cylindrical rod requiring precision machining to a two-dimensional sheet structure that can be manufactured using cost-effective processes such as metal stamping, etching, or lamination. This parameter change in geometric dimensionality directly reduces manufacturing cost while preserving frequency control capability.
Solution Approach 2:
The sheet-based resonators copy the functional essence of cylindrical rods using simpler, more manufacturable structures. The patterned conductive traces on metal sheets replicate the resonant behavior of traditional rods but can be produced at lower cost through standard PCB or metal sheet fabrication processes.
3Measurement precision
If a cavity filter with cylindrical resonator rod is used, then the resonant frequency can be controlled, but the assembly relationship becomes complicated
Solution Approach 1:
The patent changes the resonator from a three-dimensional cylindrical rod to a two-dimensional sheet, which fundamentally simplifies the assembly relationship. Sheet resonators can be directly mounted onto the cavity底板 or integrated into the cavity walls, eliminating the need for complex three-dimensional positioning and fixation mechanisms required for cylindrical rods.
Solution Approach 2:
The sheet-based resonators copy the resonant function of cylindrical rods but with a form factor that naturally simplifies assembly. The planar structure allows for direct mounting, adhesive bonding, or integration into the cavity structure, reducing assembly complexity compared to the intricate positioning required for traditional cylindrical resonators.
4Volume of stationary object
If the cavity filter is miniaturized, then the device size is reduced, but the process realization becomes difficult
Solution Approach 1:
The patent changes the resonator from a three-dimensional cylindrical rod to a two-dimensional sheet, which enables miniaturization while simplifying manufacturing processes. The sheet structure can be produced using standard fabrication processes even at small scales, avoiding the difficulty of machining and assembling miniaturized cylindrical components.
Solution Approach 2:
The sheet-based resonators copy the essential resonant functionality while adopting a form factor that is inherently more suitable for miniaturization. The two-dimensional structure can be fabricated using planar manufacturing processes that scale down more easily than three-dimensional machining, making miniaturized devices easier to produce.
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
The design results in a compact, easy-to-produce resonant filter with simplified structure, enabling efficient miniaturization and automated production while achieving capacitive coupling and adjustable resonant frequencies.
Implementation Method 1
The input resonator and the output resonator are sheets with a metal surface or metal sheets. The input resonator body and the output resonator body respectively include a resonant rod
Implementation Method 2
allowing for capacitive coupling without a physical capacitive structure
Data Source
AI summary
Disclosed is a resonant filter, which includes a housing including an input hole and an output hole, an input resonator including an input resonant body and an input port extending from the input resonant body and out of the housing through the input hole, and an output resonator including an output resonant body and an output port extending from the output resonant body and out of the housing through the output hole. The input resonator and the output resonator are fixed in the housing. The input resonator body and the output resonator body, which are sheets with a metal surface or metal sheets, respectively include a resonant rod with an upright segment, an extension segment extending from the upright segment and one end of which away from the extension segment is connected to the housing, and a first branch extending from the extension segment away from the upright segment.