Multilayer Electrode Structure for Wider High-Frequency Stopbands
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Solution Overview
Problem
Conventional functional substrates have a narrow stopband for high-speed, high-frequency signals and increasing the number of layers leads to higher costs.
Innovation Solution
A multilayer device with a dielectric structure that includes signal lines, ground electrodes, planar electrodes, and connecting electrodes, where at least one of the planar or connecting electrodes has multiple different types of electrode structures, such as varying sizes or shapes, to generate multiple resonance points and widen the stopband.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional functional substrates use mushroom structures to stop high-speed, high-frequency signals, then the stopband is formed, but the frequency bandwidth that can be stopped is narrow
Solution Approach 1:
The planar electrode is divided into multiple segments (first planar electrode and second planar electrode) with different areas, creating multiple resonance points that widen the stopband. This segmentation allows the structure to block a broader frequency range while maintaining the fundamental mushroom structure's signal blocking capability.
Solution Approach 2:
Different portions of the planar electrode structure are given different areas (first planar electrode has a first area, second planar electrode has a second area different from the first), creating local variations that generate multiple resonance frequencies. This local quality differentiation expands the effective stopband bandwidth without requiring additional layers.
2Reliability
If conventional functional substrates add mushroom structures to stop signals, then signal blocking is achieved, but the number of layers increases leading to higher cost
Solution Approach 1:
The ground electrode and planar electrodes are merged into a single functional structure where the planar electrodes extend from the ground electrode. This integration achieves signal blocking functionality without adding separate mushroom structure layers, thereby reducing overall device complexity and cost while maintaining effectiveness.
Solution Approach 2:
The ground electrode serves dual functions: as a reference potential plane and as part of the planar electrode structure for signal blocking. This multi-functionality eliminates the need for separate dedicated blocking structures, reducing layer count and cost while achieving both grounding and signal filtering objectives.
3Ease of manufacture
If conventional functional substrates use uniform electrode structures, then manufacturing is simple, but the stopband cannot be customized to required specifications
Solution Approach 1:
The electrode structure incorporates planar electrodes with different areas (first area and second area) at different locations, allowing customization of resonance frequencies to match specific stopband requirements. This local differentiation maintains manufacturability through standard PCB techniques while enabling tailored frequency response.
Solution Approach 2:
The areas of the planar electrodes are varied (first planar electrode has first area, second planar electrode has second area) to adjust resonance frequencies and customize the stopband characteristics. This parameter variation allows the structure to be adapted to different frequency requirements without changing the fundamental manufacturing process.
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 multilayer device effectively widens the stopband and prevents signal passage within specified frequency ranges while maintaining cost efficiency by avoiding excessive layering.
Implementation Method 1
at least one of the plurality of planar electrodes or the plurality of connecting electrodes includes two or more different types of electrode structures
Data Source
AI summary
A multilayer device includes: a dielectric; a signal line provided inside the dielectric and including a portion exposed on an outer surface of the dielectric; a ground electrode provided inside or on the outer surface of the dielectric and including at least a portion exposed on the outer surface of the dielectric; a plurality of planar electrodes provided inside the dielectric, arranged parallel to the ground electrode, and arranged in a first direction, and; a plurality of connecting electrodes that are provided inside the dielectric and connect the plurality of planar electrodes and the ground electrode; a plurality of signal terminals provided on the outer surface of the dielectric and connected to the signal line; and a plurality of ground terminals provided on the outer surface of the dielectric and connected to the ground electrode.