Waveguide Flange Recess Structure for Radio Wave Leakage Suppression
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Solution Overview
Problem
Waveguide tubes connecting high-frequency signal transmission paths often experience radio wave leakage due to inevitable gaps caused by mechanical tolerances, despite efforts to eliminate them through flange fastening.
Innovation Solution
The waveguide tube connecting member incorporates a recessed second flange outer peripheral surface, aligned to be (2×N+1)/4 times the free space wavelength, which positions the oscillating electric field as a node, thereby suppressing radio wave leakage even when a gap forms between connected tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flanges of waveguide tubes are fastened with fasteners to eliminate gaps, then connection reliability is improved, but manufacturing precision requirements increase due to tolerance accumulation
Solution Approach 1:
The invention changes the electrical parameter (electric field distribution) to compensate for mechanical parameter variations (gaps). By positioning the electric field node at the gap location through specific flange length design, the system maintains connection reliability despite manufacturing tolerances and gap variations.
Solution Approach 2:
The flange acts as an intermediary structure that introduces a controlled electrical feature (node position) to mediate the connection between waveguide tubes. This intermediary element allows the system to tolerate mechanical imperfections while maintaining electrical performance.
2Object-affected harmful factors
If strict gap elimination is enforced between waveguide tubes, then radio wave leakage is reduced, but assembly ease deteriorates due to tight tolerance requirements
Solution Approach 1:
The invention changes the electrical field distribution parameter by introducing a node at the gap location. This parameter change allows the system to tolerate larger physical gaps while maintaining low radio wave leakage, thereby improving assembly ease without sacrificing performance.
Solution Approach 2:
The invention converts the harmful effect of gaps (which cannot be completely eliminated) into a beneficial configuration by positioning the electric field node at the gap. The gap, originally a source of leakage, becomes a controlled feature that maintains electrical isolation while allowing mechanical tolerance.
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 configuration effectively reduces radio wave leakage by ensuring the oscillating electric field is a node at the gap, maintaining signal integrity even with tolerances exceeding 1.0 mm, enhancing mechanical design flexibility and assembly ease.
Implementation Method 1
The electric length from the first opening end of the flange end surface to the second flange outer peripheral surface along the tube radial direction is (2×N+1)/4 times a free space wavelength λ0, and N is an integer of 0 or more... positions the oscillating electric field as a node
Data Source
AI summary
A waveguide tube connecting member includes a first waveguide tube having a first waveguide path and a flange. The flange has a flange end surface extending from a first opening end of the first waveguide path toward an outer side in a tube radial direction, and a second flange outer peripheral surface which is a part of a first flange outer peripheral surface. The second flange outer peripheral surface is a surface formed in a shape in which a part of the flange has a cavity. An electric length from the first opening end of the flange end surface to the second flange outer peripheral surface along the tube radial direction is (2×N+1)/4 times a wavelength.