LC Composite Resonant Circuit With Open-Stub Frequency Tuning
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Solution Overview
Problem
Existing LC composite components with notch circuits connected to LC resonant circuits in laminated dielectric layers increase circuit area and number of layers, making it difficult to set frequency characteristics effectively.
Innovation Solution
Incorporating dual-purpose capacitors with elongated and flat electrode portions, where the elongated electrode portions can be open stubs or meandering shapes, facing dielectric layers to adjust frequency characteristics while maintaining a large capacitance, thereby reducing circuit area and number of layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If notch circuits are connected to LC resonant circuits to steepen the attenuation pole, then frequency characteristics are improved, but circuit area and number of layers increase
Solution Approach 1:
The patent combines the capacitor and inductor electrodes into a shared electrode structure. The first and second electrodes serve dual purposes: forming the capacitor when connected to each other, and forming the inductor when connected to the ground electrode. This merging eliminates the need for separate notch circuit electrodes, thereby improving frequency characteristics while reducing circuit area and layer count
Solution Approach 2:
The first and second electrodes are designed to perform multiple functions: they form the capacitor in the LC resonant circuit, and simultaneously form the inductor when connected to the ground electrode to create the notch circuit. This multi-functionality allows a single electrode structure to achieve both frequency selection and attenuation pole steepening without increasing circuit area
2Manufacturing precision
If notch circuits are connected to LC resonant circuits to steepen the attenuation pole, then frequency characteristics are improved, but the number of layers increases
Solution Approach 1:
The patent merges the capacitor and inductor electrode structures into a unified design. The first electrode on one dielectric layer and the second electrode on another dielectric layer work together to form both the capacitor and the inductor, eliminating the need for additional separate electrode layers for notch circuits. This reduces the overall number of layers while achieving improved frequency characteristics
Solution Approach 2:
The electrode structure is designed with multi-functionality, where the same first and second electrodes that form the capacitor can also form the inductor when connected to the ground electrode. This universal design allows the notch circuit functionality to be achieved without adding extra layers, thereby reducing device complexity while improving frequency characteristics
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 allows for easy adjustment of frequency characteristics by varying the length of elongated electrode portions, providing attenuation at specific frequencies without increasing the circuit area or number of layers, thus enhancing frequency control and reducing complexity.
Implementation Method 1
at least one capacitor connected between input and output electrodes includes at least two electrode portions isolated from each other. The electrode portions include at least a flat electrode portion and an elongated electrode portion having an elongated shape
Implementation Method 2
The elongated electrode portion is preferably an open stub that is open at a tip end. In this case, attenuation occurs at a frequency having a quarter wavelength equal to the stub length
Data Source
AI summary
An LC composite component has a unique structure that makes it easy to set frequency characteristics while reducing a circuit area and the number of layers. The LC composite component includes a laminated body including a plurality of dielectric layers. The laminated body is produced by forming input and output electrodes and an LC resonant circuit therein. The LC composite component includes a capacitor, which includes an elongated electrode portion having an elongated shape. The elongated electrode portion faces a flat electrode portion having a flat shape, with one of the dielectric layers interposed therebetween. At the same time, the elongated electrode portion constitutes an open stub that is open at a tip end.