Adjustable High Frequency Window for Resonance Correction
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Solution Overview
Problem
Pillbox type high frequency windows experience discrepancies in resonance frequency due to variations in component dimensional accuracy, assembly accuracy, or permittivity, leading to deviations from the designed band width, especially at higher frequencies where small dimensional changes result in significant deviations.
Innovation Solution
Incorporating plastically deformable diaphragms in the circular waveguides, which allow adjustment of the waveguide lengths to correct for discrepancies, maintaining airtightness and optimizing the resonance frequency without the need for re-manufacturing the window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pillbox type high frequency window with fixed dimensions is used, then the structure is simple and manufacturing is easy, but the resonance frequency deviates from design values due to variations in component dimensional accuracy, assembly accuracy, or permittivity
Solution Approach 1:
The patent applies the dynamics principle by making the circular waveguide length adjustable through a bellows structure. The bellows allows the waveguide length to be dynamically changed after assembly to correct resonance frequency deviations, transforming a static structure into a dynamically adjustable one. This resolves the contradiction by enabling precision adjustment without complicating the basic manufacturing process.
Solution Approach 2:
The patent applies parameter changes by modifying the length parameter of the circular waveguide through the bellows structure. By changing the waveguide length, the resonance frequency can be adjusted to match design values despite variations in other components. This allows the system to adapt to manufacturing tolerances while maintaining simple manufacturing processes.
2Productivity
If the component dimension is reduced to achieve high frequency operation, then the band width becomes wider, but small discrepancies in component dimension result in large deviations from design values
Solution Approach 1:
The patent applies parameter changes by using the bellows structure to adjust the waveguide length, compensating for frequency deviations that occur when small dimensions are used for high-frequency operation. This allows maintaining both high frequency performance with wide bandwidth and accurate resonance frequency control.
3Manufacturing precision
If a flexible waveguide with bellows structure is used to enable adjustment, then correction of resonance frequency is possible, but the structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the circular waveguide into multiple expandable sections using bellows structures. This segmentation allows independent adjustment of each section to achieve the desired total length while maintaining a relatively simple overall structure that integrates with the existing pillbox window design.
4Manufacturing precision
If the circular waveguide length is adjusted to correct resonance frequency, then the band width changes, but the resonance frequency can be corrected
Solution Approach 1:
The patent applies feedback by measuring the actual resonance frequency and using this information to adjust the waveguide length through the bellows structure. This feedback mechanism allows correction of frequency deviations while monitoring and maintaining the desired bandwidth characteristics.
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 correction of resonance frequency deviations post-assembly, maintaining optimal characteristics and reducing costs by allowing adjustments to be made within the existing structure, thus ensuring desired band width and minimizing structural negative effects from pressure differences.
Implementation Method 1
plastically deformable sections (75a and 75b) that allow plastic deformation such that at least the length in an axial direction of the circular waveguide can be changed
Implementation Method 2
a dielectric plate (30) which is disposed inside the circular pipe conduits (72a and 72b) and is formed of a dielectric airtightly held to the cylindrical section (71)
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3B
AI summary
The invention corrects a discrepancy from a design value due to variations or the like in component dimensional accuracy, assembly accuracy or permittivity, to maintain the design value. The invention comprises: a circular waveguide that has a cylindrical section having a circular pipe conduit with a circular shaped cross section, and side wall sections joined to the both sides in an axial direction of the cylindrical section; a first rectangular waveguide that has a first rectangular pipe conduit with a rectangular shaped cross section and that is joined to one of the side wall sections so that the first rectangular pipe conduit communicates with the circular pipe conduit; a second rectangular waveguide that has a second rectangular pipe conduit with a rectangular shaped cross section and that is joined to the other of the side wall sections so that the second rectangular pipe conduit communicates with the circular pipe conduit; and a dielectric plate that is configured as a plate shape, is disposed in the circular pipe conduit, and is airtightly held to the cylindrical section, wherein the circular waveguide has a plastically deformable section that is plastically deformable so that at least the length in an axial direction of the circular waveguide can be changed.