Nonreciprocal Circuit Device with Vertical Insulating Member
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Solution Overview
Problem
Nonreciprocal circuit devices, such as isolators, face challenges in reducing size and height while maintaining low insertion loss, especially at high frequencies, due to the need for small intersection angles between central electrodes, which can lead to short-circuiting and increased ferrite size.
Innovation Solution
A nonreciprocal circuit device design featuring permanent magnets, a ferrite with conductive films arranged on diagonal lines, and insulating films to prevent short-circuiting, allowing for smaller intersection angles without increasing device height, incorporating matching capacitors and resistors for impedance matching and low insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the intersection angles between central electrodes are reduced to minimize insertion loss, then the insertion loss decreases, but the gaps between conductive films become small causing short-circuiting defects
Solution Approach 1:
The patent applies dimensionality change by winding the insulating member around the ferrite in the short-side direction (vertical dimension) rather than only in the planar direction. This three-dimensional arrangement allows the insulating member to effectively separate conductive films at small intersection angles without requiring large gaps, thus preventing short-circuiting while maintaining low insertion loss.
Solution Approach 2:
The insulating member acts as an intermediary between the first and second central electrodes. By positioning this insulating member between the conductive films at their intersection points, it prevents direct contact and short-circuiting, allowing the electrodes to maintain small intersection angles for low insertion loss while ensuring reliable electrical isolation.
2Reliability
If sufficient gaps are provided between conductive films to prevent short-circuiting, then reliability improves, but the size and height of the ferrite must be increased
Solution Approach 1:
The patent utilizes the vertical dimension by winding the insulating member around the ferrite in the short-side direction. This approach provides effective electrical isolation without requiring increased gaps in the planar direction, thereby preventing short-circuiting while maintaining compact ferrite dimensions and avoiding height increase.
3Adaptability or versatility
If the intersection angles are reduced for high-frequency operation, then the device becomes suitable for high frequencies, but the gaps between conductive films become insufficient leading to short-circuiting
Solution Approach 1:
The patent enables high-frequency operation by applying dimensionality change through winding the insulating member vertically around the ferrite. This provides robust electrical isolation that allows the use of small intersection angles required for high-frequency performance without suffering from short-circuiting defects that would otherwise occur due to insufficient gaps.
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 reduced insertion loss and smaller device size by allowing for smaller intersection angles between central electrodes, making it suitable for high-frequency applications without increasing the ferrite's height or size.
Implementation Method 1
insulating films to prevent short-circuiting
Implementation Method 2
a ferrite having a rectangular or substantially rectangular shape to which a direct magnetic field is applied using the permanent magnets
Implementation Method 3
permanent magnets, a ferrite
Data Source
AI summary
A nonreciprocal circuit device includes a ferrite to which a direct magnetic field is applied using permanent magnets, central electrodes arranged on the ferrite, and a circuit substrate. The first central electrode is made of conductive films, and the second central electrode is made of conductive films. Some of the conductive films of the second central electrode are arranged on the first main surface of the ferrite, and a conductive film of the first central electrode is arranged on the conductive films through an insulating film. Furthermore, another one of the conductive films of the first central electrode is arranged on the second main surface, and the remainder of the conductive films of the second central electrode are arranged through an insulating film on the conductive film.