Inductively Coupled Filter Layout for Impedance Mismatch Control
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Solution Overview
Problem
Existing filter devices face challenges in efficiently managing signal transmission and reception across different frequency bands, leading to unintended signal superposition and impedance mismatch issues.
Innovation Solution
A filter device configuration that includes a port, a reference potential part, at least one filter, a signal line with a first inductor, and a second inductor, where the first and second inductors are inductively coupled to each other, allowing for adjustable impedance and reduced signal interaction across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional filter devices are used for signal transmission and reception across different frequency bands, then signal filtering is achieved, but unintended signal superposition and impedance mismatch occur
Solution Approach 1:
The filter device is divided into multiple independent filter units, each handling specific frequency bands. The first and second filters are configured with different characteristic impedances and are spatially separated, allowing independent optimization of each filter's impedance characteristics to prevent signal superposition and mismatch.
Solution Approach 2:
A third filter is introduced as an intermediary element between the first and second filters. This third filter acts as a buffer that isolates the impedance interactions between the first and second filters, preventing harmful impedance mismatch while maintaining signal filtering functionality across different frequency bands.
2Volume of moving object
If filters are placed close to the port for compact design, then device size is reduced, but signal interference and impedance control become difficult
Solution Approach 1:
The filter units are arranged in a three-dimensional configuration rather than a linear layout. The first and second filters are positioned at different spatial locations and orientations, allowing compact packaging while maintaining sufficient electrical distance for independent impedance control. The third filter is strategically positioned to mediate between the other two filters.
Solution Approach 2:
Each filter unit is designed with locally optimized impedance characteristics tailored to its specific function and position in the device. The first filter has impedance optimized for transmission band signals, the second filter for reception band signals, and the third filter for isolating impedance interactions, allowing each component to operate optimally despite compact arrangement.
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 configuration effectively reduces signal superposition and impedance mismatch, enhancing signal transmission and reception characteristics by allowing for precise impedance adjustment and improved frequency band management.
Implementation Method 1
The first inductor and the at least one second inductor are inductively coupled to each other
Data Source
AI summary
A filter device includes a port, a reference potential part, at least one filter, a signal line, a first inductor, and at least one second inductor. A signal is input through the port, and/or a signal is output through the port. The reference potential part is placed at a reference potential. The at least one filter filters a signal. The signal line connects the port to the at least one filter. The first inductor is at least part of the signal line. The second inductor forms a connection between the signal line and the reference potential part. The first inductor and the at least one second inductor are inductively coupled to each other.