Circulator Conductor and Housing Layout for RF Isolation
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Solution Overview
Problem
Existing circulators face challenges in maintaining effective isolation between RF signals and reducing manufacturing costs, particularly when miniaturized for use in radio-frequency applications, where magnetic attraction issues and reduced bandwidth are prevalent.
Innovation Solution
A circulator design featuring a conductor configuration with an elongate portion projecting inwardly adjacent to a magnet, combined with a housing structure having specific gap dimensions and a unique side portion configuration, which reduces magnetic field exposure and allows for improved electrical performance and manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the circulator is miniaturized for RF applications, then the device size is reduced, but magnetic attraction issues and reduced bandwidth occur
Solution Approach 1:
The patent introduces a non-magnetic spacer as an intermediary element positioned between the magnet and the conductive housing. This spacer mediates the magnetic interaction by providing physical separation that prevents direct magnetic attraction between the magnet and housing, thereby resolving the magnetic attraction stability issue while maintaining the miniaturized form factor
2Volume of moving object
If the circulator is miniaturized, then the device size is reduced, but bandwidth is reduced
Solution Approach 1:
The patent modifies the geometric parameters of the circulator structure, specifically optimizing the dimensions and positioning of the magnet, ferrite elements, and non-magnetic spacer. By carefully adjusting these parameters, the design achieves improved bandwidth performance within a miniaturized form factor, overcoming the typical bandwidth limitation of small circulators
3Ease of operation
If a magnet is used in the circulator, then RF signal routing is enabled, but magnetic attraction to the housing occurs
Solution Approach 1:
The non-magnetic spacer serves as a mediator that physically separates the magnet from the conductive housing, preventing harmful magnetic attraction while allowing the magnet to maintain its essential function of enabling RF signal routing through the ferrite elements
4Object-affected harmful factors
If the housing is made conductive, then RF shielding is improved, but magnetic attraction to the magnet increases
Solution Approach 1:
The non-magnetic spacer acts as an intermediary barrier between the conductive housing and the magnet, allowing the housing to maintain its conductive RF shielding properties while preventing the magnet from experiencing harmful magnetic attraction to the housing
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 enhances electrical performance by maintaining isolation between RF signals while reducing manufacturing costs through a smaller footprint and improved magnetic isolation, allowing for efficient operation across various frequency ranges.
Implementation Method 1
a magnet disposed on the first side of the grounding plane
Implementation Method 2
a ferrite-based disk disposed on the second side of the grounding plane
Data Source
AI summary
A circulator comprising a grounding plane including a first side and a second side, a magnet disposed on the first side of the grounding plane, a ferrite-based disk disposed on the second side of the grounding plane, and a conductor disposed on a side of the ferrite-based disk opposing the grounding plane. The conductor includes an elongate portion and the elongate portion has a distal end section projecting inwardly adjacent to a side of the magnet opposing the grounding plane. The circulator comprises a circulator housing including a plurality of side portions. The side portions have a first section and a second section, the second section extending further around a periphery of the housing than the first section such that a gap between neighboring first sections is wider than a gap between neighboring second sections.