High Frequency Filter Layered Substrate Coupling Adjustment
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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 conductor layer positional relationships, leading to fluctuations in inductive and capacitive coupling, which complicates adjustment and increases size requirements.
Innovation Solution
A high-frequency filter design featuring a layered substrate with inductively coupled resonators and capacitive coupling through strategically placed electrodes and through holes, allowing for adjustable characteristics and reduced size by minimizing capacitor area and stabilizing coupling magnitudes despite conductor layer displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the respective adjacent ones of the resonators are capacitively coupled through two capacitors connected in series (using a coupling adjusting electrode opposed to each resonator), then the filter characteristics can be adjusted, but the composite capacitance becomes smaller than individual capacitor capacitances, requiring greater capacitor area and making it difficult to reduce filter size
Solution Approach 1:
The patent merges the two separate capacitors (formed between the coupling adjusting electrode and each resonator) into a single capacitor by directly opposing the coupling adjusting electrode with a single resonator. This combining of series-connected capacitors into one capacitor increases the capacitance value, allowing for smaller capacitor area while maintaining the same coupling effect.
Solution Approach 2:
The patent transitions from a configuration where the coupling adjusting electrode is opposed to two separate resonators (requiring series connection) to a configuration where it is opposed to a single resonator (enabling direct connection). This dimensional reorganization in the electrode-resonator arrangement changes the circuit topology from series to parallel, improving capacitance efficiency.
2Adaptability or versatility
If the two coil conductors are disposed at different locations in the direction in which the layers are stacked, then capacitive coupling can be achieved, but displacement of conductor layers causes variation in relative positional relationship, leading to fluctuations in inductive and capacitive coupling magnitudes and increasing device complexity
Solution Approach 1:
The patent segments the coupling function into two independent parts: inductive coupling through adjacent resonator surfaces and capacitive coupling through the coupling adjusting electrode. This segmentation allows the capacitive coupling path to be independent of the conductor layer displacement, stabilizing the overall coupling magnitude while maintaining capacitive coupling capability.
Solution Approach 2:
The coupling adjusting electrode serves as an intermediary element that provides a stable capacitive coupling path between resonators. By introducing this intermediate component, the system achieves capacitive coupling without relying on the precise relative positioning of conductor layers, thereby stabilizing coupling magnitudes against displacement variations.
3Adaptability or versatility
If the coupling adjusting electrode is opposed to each of two adjacent resonators with a dielectric layer in between, then capacitive coupling can be achieved, but the composite capacitance of series-connected capacitors is smaller, requiring greater area for forming capacitors
Solution Approach 1:
The patent combines the capacitive coupling function into a single capacitor formed between the coupling adjusting electrode and one resonator, rather than using two series-connected capacitors. This merging increases the effective capacitance value, reducing the required area for capacitor formation while maintaining adjustability of coupling magnitude.
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 solution enables easier adjustment of filter characteristics, reduces filter size, and stabilizes performance by maintaining consistent coupling magnitudes, even with conductor layer displacement, thereby improving the filter's efficiency and reliability.
Implementation Method 1
respective adjacent ones of the resonators are inductively coupled to each other
Implementation Method 2
a capacitor is formed between one of the resonators and the coupling adjusting electrode, and another capacitor is formed between the other of the resonators and the coupling adjusting electrode
Data Source
AI summary
A high frequency filter incorporates: an unbalanced input/output terminal; two balanced input/output terminals; two resonators respectively provided between the unbalanced input/output terminal and the two balanced input/output terminals; and a layered substrate for integrating components of the high frequency filter. The two resonators are inductively coupled to each other, and are also capacitively coupled to each other through two capacitors. Each of the two capacitors is formed using a pair of first and second electrodes and a dielectric layer. The first electrode is connected to one of the resonators via a through hole. The second electrode is connected to the other of the resonators and opposed to the first electrode forming the pair with the second electrode, the dielectric layer being disposed between the second electrode and the first electrode.