Stacked Composite Filter Shielding for Signal Leakage Isolation
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Solution Overview
Problem
Stacked composite filter devices face signal leakage issues between filters due to electromagnetic field coupling, which affects the miniaturization and performance of small mobile communication devices.
Innovation Solution
The implementation of a stacked composite filter device with a conductive structure that extends in the stacking direction and is grounded, electrically connecting the inductor patterns to the grounding conductor, thereby reducing signal leakage between the first and second filters by providing a shielding effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If filters are stacked closely to reduce device size, then miniaturization is achieved, but signal leakage between filters increases due to electromagnetic field coupling
Solution Approach 1:
A conductive structure is introduced as an intermediary element between the first and second filters. This conductive structure extends in the stacking direction and has one end grounded, acting as a shield to block electromagnetic field coupling between the filters while maintaining compact device dimensions
Solution Approach 2:
The conductive structure is segmented into multiple via conductors that penetrate different dielectric layers. These via conductors are distributed across multiple locations to provide comprehensive shielding coverage between the stacked filters, effectively blocking signal leakage paths
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
Significantly reduces or prevents signal leakage between the filters, enhancing filter characteristics such as attenuation and isolation, and allowing for the miniaturization of mobile communication devices.
Implementation Method 1
a conductive structure that extends in the stacking direction and is grounded, electrically connecting the inductor patterns to the grounding conductor, thereby reducing signal leakage between the first and second filters by providing a shielding effect
Data Source
AI summary
A stacked composite filter device includes a stacked body having a first region and a second region that are different from each other. A first filter includes a first inductor and has a first pass band is arranged in the first region. A second filter includes a second inductor and has a second pass band on a lower frequency side than the first pass band is arranged in the second region. A first conductive structure extends in a stacking direction of the stacked body and includes one end grounded that is arranged in an area that is in the first region and adjacent to the second region. The other end of the first conductive structure is connected to the first inductor.