Embedded Ferrite Disc Microstrip Circulator for Uniform Magnetization
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Solution Overview
Problem
Current microstrip circulators and isolators face issues with magnetization uniformity, leading to poor performance, especially at higher frequencies, due to the use of ferrite tiles that are difficult to magnetize uniformly, resulting in increased insertion loss and intermodulation distortion.
Innovation Solution
An integrated microstrip circulator is formed by embedding a ferrite disc, such as a yttrium iron garnet disc, into a dielectric substrate with an inorganic adhesive, allowing for improved magnetization and metallization without degrading the adhesive, and incorporating conductive vias for electrical connection, enabling efficient radiofrequency applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ferrite tiles are used in microstrip circulators, then the device structure is simple, but magnetization uniformity is poor leading to increased insertion loss and intermodulation distortion
Solution Approach 1:
The patent changes the shape parameter of the ferrite component from a tile (flat rectangular) to a cylindrical form factor. This geometric parameter change enables uniform magnetization throughout the ferrite material, resolving the magnetization uniformity issue while maintaining structural simplicity. The cylindrical geometry allows for consistent magnetic field distribution during the magnetization process.
2Ease of manufacture
If ferrite tiles are used, then manufacturing is easier, but performance at higher frequencies deteriorates due to poor magnetization
Solution Approach 1:
The invention changes the geometric parameters of the ferrite component from a flat tile to a cylinder with specific height and diameter ratios. This parameter change improves high-frequency performance by enabling uniform magnetization, while the manufacturing process remains relatively simple through standard ceramic fabrication techniques and adhesive bonding.
3Area of stationary object
If conventional ferrite assemblies are used, then device size is larger, but integration with surface mount technology is limited
Solution Approach 1:
The patent transitions from a two-dimensional flat ferrite tile to a three-dimensional cylindrical ferrite component. This dimensional change enables the circulator to be mounted vertically on surface mount substrates, improving adaptability to surface mount technology while reducing the horizontal footprint area occupied by the device.
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 magnetization and reduces performance issues, providing lower insertion loss and intermodulation distortion, while allowing for miniaturization and integration of components, particularly beneficial for 5G systems operating at frequencies above 1.8 GHz.
Implementation Method 1
a ferrite disc secured within the aperture in the dielectric substrate
Implementation Method 2
allowing for improved magnetization and metallization without degrading the adhesive
Implementation Method 3
conductive vias for electrical connection, enabling efficient radiofrequency applications
Implementation Method 4
permit a signal to pass in one direction while providing high isolation to reflected energy in the reverse direction
Data Source
AI summary
A method of forming an integrated microstrip circulator includes translating a ferrite disc into an aperture in a dielectric substrate, securing the ferrite disc in the dielectric substrate with an adhesive to form a composite structure, and forming circuitry on an upper surface of the composite structure and forming surface mount contacts on a lower surface of the composite structure by metallizing the upper and lower surfaces of the composite structure.