High Frequency Filter Parallel Capacitor Design
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Solution Overview
Problem
Existing high-frequency layered band-pass filters face challenges in reducing size and maintaining consistent characteristics due to variations in positional relationships between conductor layers, leading to fluctuations in inductive and capacitive coupling, which complicates adjustment and increases loss.
Innovation Solution
A high-frequency filter design featuring a layered substrate with inductively coupled resonators and capacitors formed by electrodes and dielectric layers, allowing for parallel capacitive coupling that reduces the required area for capacitor formation and stabilizes coupling magnitudes despite conductor layer displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two capacitors are connected in series to capacitively couple adjacent resonators, then the coupling capacitance can be adjusted, but the required area for forming each capacitor becomes large
Solution Approach 1:
The patent merges two capacitors from series connection to parallel connection. The first capacitor is formed between the first resonator and the first electrode, and the second capacitor is formed between the second resonator and the second electrode. These capacitors are connected in parallel to provide the desired coupling effect, which reduces the required area compared to series connection while maintaining adjustability of the coupling capacitance.
Solution Approach 2:
The patent utilizes the layered substrate structure to arrange capacitors in parallel by distributing them across different layers and positions. The first electrode and second electrode are positioned on opposite sides of the substrate, creating a three-dimensional arrangement that achieves parallel connection without increasing the planar area significantly.
2Adaptability or versatility
If conductor layers are disposed at different locations in the stacked direction, then capacitive coupling can be achieved, but displacement during fabrication causes variations in inductive and capacitive coupling magnitudes
Solution Approach 1:
The patent introduces a reference electrode that serves as an intermediary reference point. The first electrode is positioned opposite the reference electrode, and the second electrode is positioned opposite the first electrode. This reference electrode acts as a stable reference that compensates for displacement effects, allowing the coupling capacitance to remain consistent even when conductor layers experience fabrication displacement.
Solution Approach 2:
The patent positions electrodes on opposite sides of the substrate to create a configuration where the coupling path passes through the substrate thickness. This parameter change from lateral positioning to vertical/opposite positioning makes the coupling less sensitive to lateral displacement during fabrication, as the opposite-side positioning maintains the coupling geometry even when layers shift.
3Area of stationary object
If the area for forming capacitors is reduced, then the filter size can be reduced, but the coupling capacitance becomes difficult to adjust to desired values
Solution Approach 1:
By connecting two capacitors in parallel instead of series, the patent achieves the desired coupling capacitance with smaller individual capacitor areas. The parallel connection provides additive capacitance effect, allowing smaller capacitors to achieve the same total capacitance as larger series-connected capacitors, thus reducing the overall filter size while maintaining adjustability.
Solution Approach 2:
The patent designs the electrode structures with adjustable dimensions and positions, allowing dynamic optimization of the capacitor area and coupling capacitance. The first and second electrodes can be positioned and sized to achieve the desired coupling capacitance value while minimizing the required area, providing flexibility in design optimization.
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 design enables easier adjustment of filter characteristics, reduces size, and minimizes variations in filter performance due to positional changes, thereby enhancing reliability and efficiency.
Implementation Method 1
respective adjacent ones of the resonators are inductively coupled to each other
Implementation Method 2
respective adjacent ones of the resonators are also capacitively coupled to each other
Implementation Method 3
with a dielectric layer disposed in between
Data Source
AI summary
A high frequency filter comprises a first resonator and a second resonator provided inside a layered substrate. The first and second resonators are inductively coupled and capacitively coupled to each other through a first capacitor and a second capacitor connected to each other in parallel. The first capacitor is formed using first and third electrodes and a dielectric layer. The first electrode is connected to the first resonator via a through hole. The third electrode is connected to the second resonator and opposed to the first electrode. The second capacitor is formed using second and fourth electrodes and the dielectric layer. The second electrode is connected to the second resonator via a through hole. The fourth electrode is connected to the first resonator and opposed to the second electrode.