Non-Reciprocal Circuit Layout for High-Frequency Isolation
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Solution Overview
Problem
Isolation characteristics of isolators deteriorate as the frequency of the input signal increases.
Innovation Solution
A non-reciprocal circuit element comprising a metal layer, loss layer, and magnet, where the metal layer has specific terminal configurations and is sandwiched by magnetic materials and absorbers, with a minimum width between certain sides of the metal layer and absorbers optimized to maintain isolation characteristics at high frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frequency of the input signal is increased, then the transmission speed and performance of the isolator is improved, but the isolation characteristics deteriorate
Solution Approach 1:
The patent changes the geometric parameters of the metal layer, specifically making the minimum width between the first side and second side smaller than the width between parallel straight lines. This parameter modification adjusts the cutoff frequency to higher values, enabling the isolator to maintain good isolation characteristics even at high input signal frequencies up to 1.5 times the center frequency
Solution Approach 2:
The patent applies curvature to the metal layer boundaries by making the first side and/or second side bent or curved toward specific straight lines. This curved geometry modifies the electromagnetic field distribution and raises the cutoff frequency, preventing isolation deterioration at high frequencies while maintaining transmission performance
2Reliability
If the minimum width between the first side and second side is reduced, then the cutoff frequency is raised and isolation characteristics are maintained at high frequencies, but the manufacturing precision requirements increase
Solution Approach 1:
The patent transitions from a straight-line geometry to a curved geometry in the metal layer boundaries. By curving the first side and/or second side toward specific straight lines, the patent achieves the required minimum width reduction without creating sharp corners or complex features, thereby maintaining manufacturability while still raising the cutoff frequency to preserve isolation characteristics at high frequencies
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 circuit element maintains isolation characteristics even when high-frequency signals are input, suppressing deterioration by adjusting the cutoff frequency to higher values.
Implementation Method 1
The magnet and the metal layer sandwich at least the magnetic material in the thickness direction
Implementation Method 2
The loss layer includes a magnetic material and an absorber
Data Source
AI summary
A non-reciprocal circuit element includes a metal layer, a loss layer, and magnet. The metal layer includes a first terminal, a second terminal, and a third terminal. The loss layer includes a magnetic material and an absorber. The magnetic material overlaps a first region of the metal layer in a thickness direction. The absorber overlaps a second region of the metal layer in the thickness direction. The magnet and the metal layer sandwich at least the magnetic material in the thickness direction. When viewed from the thickness direction, a minimum width between a first side of the metal layer connecting the first and second terminals and a second side of the absorber on a side of the first and second terminals is smaller than a width between a first straight line connecting both ends of the first side and a second straight line connecting both ends of the second side.