Microwave Circulator Expandable Centring Rings
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Solution Overview
Problem
Conventional microwave circulators experience discontinuities and distortions in their transfer function due to minute changes in the internal electromechanical grounding structure, caused by differential thermal expansion, manufacturing tolerances, and mechanical contact inconsistencies, leading to 'glitches' that affect signal routing.
Innovation Solution
A microwave circulator design featuring an outer metal housing with a cavity containing magnets and an annular centring arrangement of expandable austenitic stainless steel rings with inclined faces, ensuring intimate contact with the housing and reducing mechanical stress, along with integrally formed ports and a magnetic material housing to maintain a stable magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional circulators use separate components with mechanical connections for grounding, then assembly is easier, but the grounding structure becomes unstable and prone to glitches due to thermal expansion and manufacturing tolerances
Solution Approach 1:
The patent merges the grounding ring and centring arrangement into a single integrated component. The grounding ring is formed as one piece with the centring features, eliminating separate mechanical connections and ensuring stable electrical contact with the housing while maintaining ease of assembly as a single component.
Solution Approach 2:
The grounding ring serves multiple functions simultaneously: it provides electrical grounding, centring of the cavity contents, and mechanical support. This multi-functional design eliminates the need for separate components while improving reliability through a unified structure.
2Manufacturing precision
If rigid centring structures are used, then manufacturing precision is easier to achieve, but thermal expansion differences cause grounding instability and glitches
Solution Approach 1:
The grounding ring is designed with elastic properties that allow it to deform slightly under thermal stress. This parameter change enables the structure to accommodate differential thermal expansion between different materials while maintaining continuous electrical contact and stable centring.
Solution Approach 2:
The grounding ring incorporates flexible elastic elements that can deform to accommodate thermal expansion differences. This flexibility maintains reliable electrical grounding and centring precision across temperature variations without causing glitches.
3Device complexity
If non-expandable rings are used for centring, then the structure is simpler, but intimate contact with housing walls cannot be ensured, leading to grounding interruptions
Solution Approach 1:
The grounding ring is designed to be expandable rather than rigid. It can dynamically adjust its dimensions to achieve intimate contact with the housing walls, ensuring continuous electrical grounding without requiring complex adjustment mechanisms.
Solution Approach 2:
The expandable grounding ring utilizes thermal expansion principles to maintain contact with the housing walls. As temperature changes, the ring expands or contracts to ensure continuous electrical contact, preventing grounding interruptions while maintaining structural simplicity.
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
The solution provides a high-integrity continuous electrical earth path, effective EMI performance, and minimizes signal leakage, significantly reducing glitches by stabilizing the electromechanical grounding structure and maintaining a consistent magnetic field.
Implementation Method 1
the second ring is expandable and is arranged to form intimate contact with the internal walls of the metal housing, when a force is applied to urge the centring arrangement along the cavity
Implementation Method 2
an annular centring arrangement of expandable austenitic stainless steel rings with inclined faces, ensuring intimate contact with the housing and reducing mechanical stress, along with integrally formed ports and a magnetic material housing to maintain a stable magnetic field
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A microwave circulator having an outer metal housing with a cavity containing at least one magnet and an annular centring arrangement interposed between the outside of the magnet and the cavity. The centring arrangement includes first and second solid metal rings, the two rings having cooperating inclined faces arranged such that when a force is applied to urge the centring arrangement along the cavity, one ring is displaced outwardly into intimate contact with the inside of the cavity.