Multilayer Filter Layout for Balanced-Signal Spurious Reduction
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Solution Overview
Problem
Existing multilayer filters struggle to effectively reduce spurious in a desired frequency range, which affects their performance in processing balanced signals.
Innovation Solution
A multilayer filter design featuring a multilayer body with stacked dielectric layers and a conductor unit including input/output portions and resonant circuits. The resonant circuits are arranged perpendicular to the dielectric layers, with capacitor conductors in a dielectric layer with a higher dielectric constant and inductor conductors in a layer with a lower dielectric constant, allowing for adjustment of the frequency range and reduction of spurious.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all capacitor conductors are provided in the second dielectric layer (lower dielectric constant), then the frequency range can be adjusted, but the size of the capacitor increases
Solution Approach 1:
The capacitor conductors are segmented and distributed across two different dielectric layers (first and second dielectric layers) rather than being concentrated in a single layer. This segmentation allows the capacitor to achieve the desired frequency characteristics while maintaining a compact size by utilizing the different dielectric properties of multiple layers.
Solution Approach 2:
The capacitor structure employs composite dielectric materials with different dielectric constants (first dielectric layer and second dielectric layer). By combining materials with different electrical properties, the capacitor achieves optimized frequency characteristics without requiring increased size, as each material contributes different electrical characteristics to the overall capacitance.
2Device complexity
If the multilayer filter uses conventional dielectric layer configuration, then the structure is simple, but spurious cannot be effectively reduced in the desired frequency range
Solution Approach 1:
Different dielectric layers are assigned different dielectric constants tailored to specific functional requirements. The first dielectric layer with one dielectric constant is used in specific regions for frequency control, while the second dielectric layer with a different dielectric constant is used in other regions for spurious reduction. This local optimization of dielectric properties allows simultaneous achievement of frequency adjustment and spurious suppression.
Solution Approach 2:
The dielectric constant parameter is varied across different layers to achieve different electrical characteristics. By changing the dielectric constant from one layer to another, the filter can control resonant frequencies and suppress spurious signals without requiring complex structural modifications. The parameter change approach allows independent optimization of different filter 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 the adjustment of the frequency range where spurious occur, effectively reducing spurious in the desired frequency range while maintaining a compact filter size.
Implementation Method 1
The conductor unit includes input/output portions and first and second resonant circuits
Implementation Method 2
The plurality of dielectric layers include a first dielectric layer and a second dielectric layer. The second dielectric layer has a dielectric constant lower than that of the first dielectric layer
Data Source
AI summary
In a multilayer filter, first and second resonant circuits are arranged in a direction crossing a stacking direction of a plurality of dielectric layers. An input/output portion includes an input/output port group including an unbalanced port and a pair of balanced ports or an input/output port group including two pairs of balanced ports. The second resonant circuit includes an inductor conductor, a first capacitor conductor, and a second capacitor conductor. The inductor conductor includes first and second ends. The first capacitor conductor is connected to the first end. The second capacitor conductor is connected to the second end. The second dielectric layer has a dielectric constant lower than that of the first dielectric layer. The first and second capacitor conductors are provided in the first dielectric layer. At least a part of the inductor conductor is provided in the second dielectric layer.