Waveguide Connection Structure With Quarter-Wavelength Stub
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Solution Overview
Problem
Existing waveguide connection methods using solder for resin substrates face issues with incomplete connections leading to increased insertion loss and higher material and assembly costs, as well as shape deviations from design specifications.
Innovation Solution
A waveguide connection structure that employs a tubular waveguide path with a stub of a quarter wavelength depth, where the stub's open end internally contacts a contour line spaced radially outward by a quarter wavelength, and an electrically conductive frame part makes external contact with the stub's outer side, forming a choke trench to ensure reliable connection without solder, thereby maintaining low insertion loss even with incomplete connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solder is used to ensure reliable connection to the waveguide part, then connection reliability is improved, but material costs and assembly costs are increased
Solution Approach 1:
The invention extracts and eliminates the solder material from the connection process. By designing a mechanical pressing structure where the waveguide case directly contacts the connection substrate through pressing portions, the patent removes the need for solder entirely, thereby reducing material costs and assembly complexity while maintaining connection reliability
Solution Approach 2:
The waveguide case structure itself provides the connection function through its pressing portions that directly contact the connection substrate. The waveguide case serves dual purposes: guiding electromagnetic waves and providing mechanical connection, eliminating the need for separate soldering processes
2Ease of manufacture
If solder amount is less than required, then material costs are reduced, but electrical connection becomes incomplete leading to increased insertion loss
Solution Approach 1:
The pressing portions of the waveguide case automatically establish electrical contact with the connection substrate through direct mechanical pressure. This self-contacting mechanism ensures complete electrical connection without requiring external solder material, thereby eliminating insertion loss while reducing material costs
3Reliability
If solder amount is more than required, then connection reliability is improved, but solder leaks to undesired parts causing shape deviation from design
Solution Approach 1:
The invention removes solder entirely from the connection process, replacing it with a mechanical pressing structure. This eliminates the risk of solder leakage to undesired parts and the resulting shape deviations, while maintaining connection reliability through direct contact between pressing portions and the connection substrate
Solution Approach 2:
The pressing portions are designed with specific geometric shapes that conform to the connection substrate surface. This shape-based contact ensures precise alignment and connection without material overflow, maintaining manufacturing precision
4Ease of manufacture
If conventional waveguide connection method is used, then connection is achieved, but insertion loss increases due to incomplete connection at the connection part
Solution Approach 1:
The pressing portions of the waveguide case automatically establish and maintain electrical contact with the connection substrate through direct mechanical pressure. This self-contacting mechanism ensures complete electrical connection throughout the connection part, preventing signal leakage and reducing insertion loss while achieving reliable connection
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 solution allows for reliable waveguide connections on resin substrates without solder, reducing insertion loss and material costs, while maintaining the waveguide's intended shape and functionality.
Implementation Method 1
a stub 3 which makes internal contact with a contour line L, and the contour line L being spaced apart from an inner wall part of one end of a first waveguide path 2 by only a quarter of a wavelength λ
Implementation Method 2
a first waveguide path 2 which transmits electromagnetic waves R having a predetermined wavelength λ
Data Source
AI summary
A waveguide includes: a first tubular waveguide path that transmits electromagnetic waves having a predetermined wavelength; and a stub that is formed such that a depth thereof becomes a quarter of the predetermined wavelength, an open end of the stub making internal contact with a contour line, and the contour line being spaced apart from an inner wall part of one end of the first tubular waveguide path in a radially outward direction by only a quarter of the predetermined wavelength.