RF Filter Module Ground-Line Tuning for Attenuation Control
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Solution Overview
Problem
Existing RF filters face challenges in finely adjusting attenuation characteristics outside the pass band, which increases development and production costs due to the need to change the shape or size of conductor patterns.
Innovation Solution
A filter module with a module substrate and filter element, featuring a ground terminal, signal terminals, and an inductance adjusting line that connects the ground land to the ground plane, allowing for adjustment of attenuation characteristics without altering the filter element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the shape or size of the conductor pattern is changed to adjust attenuation characteristics, then the attenuation characteristics can be finely adjusted, but the development and production costs increase
Solution Approach 1:
The invention separates the attenuation adjustment function from the filter element itself by introducing a distinct attenuation adjustment circuit on the substrate. This circuit includes adjustable components (such as variable capacitors or inductors) that can be independently tuned without affecting the filter element's conductor pattern, thereby enabling fine attenuation control while maintaining standardized production processes
Solution Approach 2:
The invention introduces an intermediary attenuation adjustment circuit between the signal source and the filter element. This intermediary circuit acts as a mediator that provides the necessary attenuation adjustment functionality without requiring modifications to the filter element's internal conductor patterns, thus avoiding increased development and production costs
2Manufacturing precision
If the conductor pattern shape or size is modified to achieve desired attenuation, then the attenuation characteristics improve, but the device complexity increases
Solution Approach 1:
The invention divides the system into distinct functional modules: the filter element with fixed conductor patterns and a separate attenuation adjustment circuit. This segmentation allows the conductor patterns to remain simple and standardized while the attenuation characteristics are controlled by the adjustable components in the separate circuit, reducing overall device complexity
Solution Approach 2:
The invention replaces static conductor pattern designs with dynamic attenuation adjustment capabilities. By using adjustable components (such as variable capacitors or inductors) in the attenuation adjustment circuit, the system can dynamically change attenuation characteristics without physically modifying the conductor patterns, thereby simplifying the overall device design
Data Source
AI summary
A filter element is mounted on a module substrate. The filter element includes a ground terminal and a pair of signal terminals. The module substrate includes a ground plane, a ground land, and an inductance adjusting line that connects the ground land to the ground plane. The ground terminal of the filter element is connected to the ground land of the module substrate. The inductance adjusting line includes an in-plane extending portion that extends in an in-plane direction of the module substrate.