Waveguide Filter Tuning Sheet for Millimeter Wave Tolerance Compensation
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Solution Overview
Problem
The challenge lies in creating a cavity-type waveguide filter for millimeter waves that can facilitate a tuning process to compensate for machining tolerances, while maintaining high performance and reducing the need for precise machining, which is costly and time-consuming, especially in miniaturized structures.
Innovation Solution
The proposed solution involves a waveguide filter design that includes a casing, partitions, a plug structure or cap, and tuning sheets, where the tuning sheets are interposed between the cap and the casing to adjust the coupling between resonance sections, allowing for compensation of machining tolerances and reducing the need for precise machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-precision machining is used to achieve accurate filter performance, then filtering performance is improved, but manufacturing cost and processing time increase significantly
Solution Approach 1:
The filter structure is divided into modular components (casing, cap, resonance sections, partitions) that can be manufactured separately with relaxed tolerances and then assembled. This segmentation allows each component to be produced more easily while the overall assembly achieves the required precision through adjustable elements like tuning sheets and positioning structures.
Solution Approach 2:
Tuning sheets and positioning structures serve as intermediary elements between the cap and casing that compensate for machining tolerances. These intermediaries allow adjustment of the coupling between resonance sections, enabling fine-tuning of filter characteristics without requiring high-precision machining of all components.
2Manufacturing precision
If high-precision machining is used to achieve accurate filter performance, then filtering performance is improved, but processing time increases significantly
Solution Approach 1:
By dividing the filter into pre-manufactured modules that can be produced in parallel with standard machining processes, the overall processing time is reduced. The modular design allows simultaneous manufacturing of multiple components rather than sequential precision machining of the entire structure.
Solution Approach 2:
Standardized components and tuning elements are prepared in advance with conventional tolerances. The assembly process incorporates built-in adjustment mechanisms that allow for tolerance compensation during assembly rather than requiring precision machining of all features, significantly reducing total manufacturing time.
3Reliability
If miniaturized filter structure is used to meet millimeter wave requirements, then frequency performance is improved, but tolerance compensation becomes more difficult
Solution Approach 1:
The filter design incorporates adjustable and removable components (tuning sheets, caps with positioning structures) that enable dynamic adjustment of coupling gaps and resonance characteristics. This dynamic adjustability allows compensation for machining tolerances even in miniaturized structures where absolute dimensions are small, by providing post-manufacturing tuning capability.
Solution Approach 2:
The design allows for parameter adjustment through tuning sheets of varying thicknesses and positioning structures that modify coupling gaps. By changing these parameters after manufacturing, the filter can be tuned to achieve precise frequency performance despite the miniaturized scale and associated tolerance challenges.
4Manufacturing precision
If complex tuning process is used to compensate for machining tolerances, then filter performance is improved, but device complexity increases
Solution Approach 1:
Tuning sheets serve as simple intermediary elements that compensate for machining tolerances without requiring complex tuning mechanisms. The positioning structures on the cap provide straightforward alignment features, making the tuning process simple and intuitive rather than complex, while still achieving the required filter performance.
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
This design enables efficient tuning and maintains high performance, reducing processing costs and improving production yield by simplifying the machining process and allowing for more flexible manufacturing, thus making mass production more feasible.
Implementation Method 1
A waveguide filter utilizes a resonance phenomenon caused by its physical structure, in which a tubular waveguide is designed to have a length corresponding to the frequency filtering characteristics thereof
Data Source
AI summary
The present disclosure provides a waveguide filter including a casing configured to form a waveguide having a side wall, a part of which is formed with a through hole, a plurality of partitions configured to form resonance sections by partitioning an interior of the waveguide within the casing, a cap configured to have a body that is fitted within the through hole of the casing so as to define at least a part of an inner region of the waveguide, and to have a head formed to correspond to at least a part of a peripheral region around the through hole of the casing so that the head is coupled with the casing, and at least one tuning sheet configured to be held interposed between the head of the cap and the casing when coupled.