RF Filter Module Ground Strip Line for Wider Passband
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing RF filter modules in mobile devices face challenges in achieving a wider passband without increasing the size of the filter or changing the substrate material, which limits their bandwidth and efficiency.
Innovation Solution
The implementation of a filter module with a strip line configuration, either on a single layer or multiple layers, which generates inductance between the filter and the ground, increasing the difference between resonance and anti-resonance frequencies and thus enhancing the passband width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of the filter is increased to achieve a wider passband, then the bandwidth is improved, but the device occupies more space
Solution Approach 1:
The patent changes the electrical parameters of the filter by introducing strip lines that generate inductance between the filter and ground. This modifies the resonance and anti-resonance frequencies, effectively widening the passband without changing the physical dimensions of the filter structure.
Solution Approach 2:
The strip lines act as an intermediary element between the filter and ground, generating inductance that modifies the filter's frequency characteristics. This intermediary structure enables bandwidth expansion without requiring larger filter dimensions.
2Quantity of substance
If the substrate material is changed to achieve a wider passband, then the bandwidth is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
Instead of changing substrate materials, the patent changes the electrical parameters by adding strip lines that generate inductance. This approach achieves the desired bandwidth expansion while maintaining the same substrate material, thereby simplifying manufacturing and reducing costs.
3Quantity of substance
If additional components are added to widen the passband, then the bandwidth is improved, but the device complexity increases
Solution Approach 1:
The strip lines are integrated with the existing filter structure and ground plane, merging the inductance-generating function with the existing layout. This combination approach widens the passband without significantly increasing structural complexity or requiring separate additional components.
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 effectively increases the bandwidth of the passband by 1-10% for single-layer implementations and up to 3% without changing the chip size, providing a more efficient and wider passband without occupying additional space.
Implementation Method 1
The strip line is configured to generate an inductance between the filter and the ground. The inductance generated by the strip line is configured to increase the difference between a resonance frequency and an anti-resonance frequency of the filter.
Implementation Method 2
An acoustic wave filter, which is used widely in the wireless communication field, can include a plurality of resonators arranged to filter a radio frequency signal.
Data Source
AI summary
Filter modules having a wider passband are provided herein. In certain embodiments, the filter module comprises an input node; an output node; a filter disposed along a signal path extending from the input node to the output node; a strip line configured to generate an inductance between the filter and a ground such to increase a bandwidth of a passband of the filter module, the single strip line disposed on multiple layers, each of the multiple layers defined by a plurality of pulse-shaped) portions of the strip line disposed on a plane.