Bent Central Conductor Assembly for Impedance Matching
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Solution Overview
Problem
Miniaturization of non-reciprocal circuit devices, such as isolators in cell phones, leads to impedance deviation and mismatching due to reduced central conductor size, making it difficult to achieve desired resonance and insertion loss without increasing the number of parts.
Innovation Solution
The central conductor assembly is designed with a second central conductor that is bent or formed in a coil configuration, allowing high-frequency current to flow in the same or opposite direction to the first central conductor, thereby adjusting impedance without additional matching circuits, and providing larger inductance for improved resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the central conductor size is reduced for miniaturization, then the device size is reduced, but impedance deviation and mismatching occur
Solution Approach 1:
The second central conductor is bent into a curved configuration instead of being straight. This curvature increases the inductance of the second central conductor, allowing it to provide sufficient impedance transformation and matching performance even when the overall conductor size is reduced for miniaturization.
Solution Approach 2:
The second central conductor is configured to extend in multiple directions and dimensions relative to the first central conductor, including bending back towards it. This multi-dimensional arrangement increases the effective inductance and provides better impedance matching without requiring a larger overall device footprint.
2Manufacturing precision
If additional matching circuits are added to correct impedance deviation, then impedance matching is improved, but device complexity increases
Solution Approach 1:
The impedance matching function is merged into the second central conductor itself by configuring it with a bent shape. This eliminates the need for separate matching circuits or additional components, as the conductor's own geometry provides the necessary impedance transformation and matching performance.
Solution Approach 2:
The second central conductor serves multiple functions: it provides the primary inductance for the resonant circuit, performs impedance transformation, and provides impedance matching to the load. This multi-functionality reduces the overall device complexity by eliminating dedicated matching circuits.
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
This configuration achieves impedance matching and excellent electric characteristics like reduced insertion loss without adding extra components, enabling the miniaturization of non-reciprocal circuit devices while maintaining performance.
Implementation Method 1
a permanent magnet applying a DC magnetic field to the magnetic body to generate a rotating resonance magnetic field therein
Implementation Method 2
generate a rotating resonance magnetic field therein
Implementation Method 3
at least one end portion of the second central conductor being bent, such that high-frequency current flows therethrough in the same direction as or in an opposite direction to that of high-frequency current flowing through the first central conductor
Data Source
AI summary
A central conductor assembly for use in a non-reciprocal circuit comprising a first inductance element between a first input/output port and a second input/output port, and a second inductance element between the second input/output port and a ground port, a magnetic substrate being integrally provided with a first central conductor constituting the first inductance element and a second central conductor constituting the second inductance element; and the second central conductor being crossing the first central conductor on a main surface side of the substrate via a magnetic layer or a dielectric layer, with at least one end portion thereof bent such that high-frequency current flows therethrough in the same direction as or in an opposite direction to that of high-frequency current flowing through the first central conductor.