Matching Module Asymmetric Inductors for Parasitic Capacitance
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Solution Overview
Problem
Existing matching modules in duplexers face challenges in maintaining equal capacitances due to parasitic capacitance, which affects signal separation and interference minimization between transmitting and receiving signals.
Innovation Solution
The design incorporates a matching module with spiral-shaped inductor patterns and a capacitor pattern on a dielectric sheet, where the inductor patterns are symmetrical and connected through a central connection pattern, generating mutual capacitance and ensuring equal capacitances between capacitors to maintain a matched frequency band and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a matching module uses a conventional capacitor-inductor-capacitor configuration to separate transmitting and receiving signals, then signal separation is achieved, but parasitic capacitance causes unequal capacitances between the two capacitors, degrading performance
Solution Approach 1:
The patent applies asymmetry by intentionally designing the first and second inductor patterns with different geometries (different numbers of loops, different sizes, different shapes) to compensate for the asymmetric parasitic capacitances that arise in the matching module. This asymmetric design allows the capacitors to achieve equal effective capacitances despite the inherent parasitic differences, thereby resolving the contradiction between signal separation performance and capacitance equality.
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 ensures consistent capacitances and minimizes interference between transmitting and receiving signals, maintaining the electrical characteristics of filters and achieving effective signal separation.
Implementation Method 1
a capacitor pattern provided in an edge region of the dielectric sheet and configured to form mutual capacitance with the inductor pattern
Data Source
AI summary
A matching module includes an inductor pattern including a first inductor pattern and a second inductor pattern, each respectively provided in a spiral shape, and a connection pattern connecting the first inductor pattern and the second inductor pattern and provided in a central region of a dielectric sheet, and a capacitor pattern provided in an edge region of the dielectric sheet and configured to form mutual capacitance with the inductor pattern, wherein rotational directions of the first inductor pattern and the second inductor pattern that are provided in the spiral shape are the same.