Housing-Free Ferrite Circulator Assembly for Low-Profile RF Design
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Solution Overview
Problem
Conventional circulators are large in size and costly due to the need for a housing to provide compression force for ferrites and magnets, which can lead to cracking and performance issues, affecting the size of 5G antenna arrays and increasing production costs.
Innovation Solution
A circulator design featuring a ferrite stripline assembly with junction circuits formed directly on ferrite layers, eliminating the need for a compression housing and incorporating a magnetic return path, resulting in a self-contained, lower profile circulator with improved alignment and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a housing is used to provide compression force for ferrites and magnets, then the structural stability is improved, but the circulator size increases and production cost increases
Solution Approach 1:
The patent removes the housing structure from the circulator design. Instead of using a housing to provide compression force, the invention uses direct mechanical contact and magnetic attraction between the ferrite layers and magnet to maintain structural stability, thereby eliminating the space-consuming housing while preserving functional integrity
Solution Approach 2:
The patent combines multiple functions into the ferrite layers themselves. The ferrite layers serve both as magnetic bias components and as structural elements that directly contact and compress the magnet, eliminating the need for separate housing structures. This merging reduces overall circulator size while maintaining compression force
2Stability of the object's composition
If a housing is used to provide compression force for ferrites and magnets, then the structural stability is improved, but the production cost increases
Solution Approach 1:
By removing the housing component entirely, the patent reduces the number of parts that need to be manufactured, assembled, and quality-checked. This extraction of the housing simplifies the manufacturing process and reduces production costs while the direct contact design maintains structural stability
Solution Approach 2:
The ferrite layers and magnet are designed to self-compress through their own magnetic attraction and mechanical contact, eliminating the need for external housing structures to provide compression force. This self-service mechanism reduces manufacturing complexity and cost
3Force
If conventional circulator design is used, then the compression force is provided for assembling ferrites, circuits, and magnets, but the profile height increases
Solution Approach 1:
The patent transitions from a vertical stacking arrangement (conventional design with housing) to a more compact dimensional arrangement where ferrite layers are positioned adjacent to each other with circuits formed on their surfaces. This dimensional reorganization maintains compression force through direct contact while significantly reducing profile height
Solution Approach 2:
The patent uses thin ferrite layers and circuit traces that can be directly bonded together, replacing the need for thick housing structures. The thin-film approach allows compression force to be applied more efficiently in a compact vertical space, reducing overall profile height
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 design achieves a smaller size, reduced production costs, and more consistent performance by eliminating housing, reducing cracking risks, and enhancing electrical and mechanical stability.
Implementation Method 1
a magnet over the second ferrite layer for providing magnetic bias
Implementation Method 2
The ferrites are ceramic materials including iron oxide (Fe2O3) and are soft magnetic. The magnet(s) can be a ceramic or rare-earth magnet and are hard magnetic.
Implementation Method 3
an intermetallic bond formed between the first circuit and the second circuit
Implementation Method 4
depositing a seed layer over all surfaces of a first ferrite layer and a second ferrite layer by sputtering
Data Source
AI summary
A circulator for radio frequency is provided. The circulator may include a ferrite stripline assembly, which includes a first ferrite layer, a second ferrite layer over the first ferrite layer, and a junction circuit between the first ferrite layer and the second ferrite layer. The circulator may also include a magnet over the second ferrite layer for providing magnetic bias.