Waveguide Choke Flange Virtual Continuity
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Solution Overview
Problem
Conventional waveguide joints require precise alignment and high precision parts to minimize energy reflections and power leakage, making them unsuitable for applications with mechanical vibrations or surface degradation, and are not frequency insensitive.
Innovation Solution
The design of waveguide interfaces that incorporate a choke flange with a step configuration and a shield flange, creating a virtual continuity through an air gap, allowing for imperfect face-to-face abutment and reduced precision in parts, while maintaining matched impedance and frequency insensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If flat contact-type flanges are used with precise alignment and tight face-to-face surface abutment, then energy reflections and power leakage are minimized, but manufacturing precision and assembly complexity increase significantly
Solution Approach 1:
A choke flange is introduced as an intermediary component between two waveguide sections. The choke flange includes a circular groove forming a half-wave low-impedance line that acts as a mediator to prevent energy leakage and reflections without requiring tight mechanical contact between flanges. The groove depth and radius are each quarter wavelength at the design frequency, creating current nodes at contact points that eliminate the need for precise ohmic contact.
Solution Approach 2:
The invention changes the electrical parameters of the joint by introducing a resonant structure (choke groove) with specific dimensional parameters (quarter wavelength depth and radius). This transforms the joint from requiring mechanical precision to relying on electromagnetic parameter matching, making the system frequency-sensitive at the design frequency but tolerant of mechanical imperfections.
2Reliability
If flat contact-type flanges are used with tight face-to-face surface abutment, then electrical continuity is maintained, but mechanical vibration tolerance and durability decrease
Solution Approach 1:
The choke flange groove structure serves as a mediator that maintains electrical continuity through electromagnetic field coupling rather than direct mechanical contact. The half-wave low-impedance line in the groove creates current nodes at the contact points, allowing the system to tolerate mechanical vibrations and surface degradation while maintaining reliable electrical performance.
3Loss of energy
If conventional choke flanges are used with precise alignment requirements, then return loss and SWR are minimized, but device complexity and number of components increase
Solution Approach 1:
The invention merges the choke function with the flange structure itself. The choke flange integrates the circular groove directly into the flange body, combining the mechanical joining function with the electromagnetic choking function in a single component. This eliminates the need for separate spring contacts or additional alignment mechanisms, reducing overall device complexity while maintaining 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
These interfaces achieve low insertion loss and high return loss across the frequency band, tolerating gaps up to 0.06″ between flanges, reducing the need for spring contacts and ensuring robust mechanical and electrical performance.
Implementation Method 1
waveguide interface having a choke flange associated with a waveguide and a shield flange associated with another waveguide
Implementation Method 2
the body and the neck conceptually have half-wavelength and quarter wavelength dimensions, respectively, that correspond to the design frequency
Implementation Method 3
The shield flange and step formed by the neck and body of the received choke flange define an air gap that has the effect of creating a virtual continuity through the joint
Data Source
AI summary
Waveguide flanges for joining waveguide sections or components are designed to achieve mechanical strength and exhibit desired electrical properties such as relatively low insertion loss and high return loss. The present invention contemplates waveguide interfaces with a new choke flange designed to engage with a shield flange and provide a joint with improved electrical properties. The new choke designs produce a virtual continuity through the waveguide joints and minimize electrical energy leakage. The electrical and mechanical properties of the joint in the waveguide interfaces are robust and able to tolerate lower levels of parts precision, imperfect mating of the flanges without metal-to-metal contact and gaps up to 0.06″ or more between the mating flange surfaces.