Multilayer Filter With Floating Electrodes for Stable Balance
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Solution Overview
Problem
Existing multilayer balance filters experience unstable balance characteristics due to phase deviations caused by ground wiring patterns and mounting state variations on motherboards, making it difficult to maintain stable balance between balanced terminals.
Innovation Solution
A multilayer filter design featuring a serial circuit of capacitors connected between balanced terminals, with floating electrodes not connected to ground, minimizing the influence of external ground wiring patterns and ensuring a stable balance characteristic. The capacitors are arranged in a series configuration, with one common floating electrode, and the electrode groups are partially overlapped to reduce size and optimize capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If balanced output terminals are connected to ground through capacitors in related-art multilayer balance filters, then the filter can provide unbalanced-balanced transforming function, but the balance characteristic becomes unstable due to phase deviations caused by ground wiring patterns and mounting state variations
Solution Approach 1:
The invention extracts and removes the ground connection from the capacitor circuit. Instead of connecting capacitors from each balanced terminal to ground (related art), the capacitors are connected only between the two balanced terminals, eliminating the ground connection that causes phase deviations due to ground wiring patterns and mounting variations.
Solution Approach 2:
The invention segments the capacitor connection into two separate capacitors connected in series between the balanced terminals, rather than using a single ground-referenced capacitor configuration. This segmentation allows the circuit to maintain the unbalanced-balanced transforming function while avoiding ground-related phase deviations.
2Reliability
If floating electrodes are used in the capacitor configuration, then phase deviations are reduced and balance characteristic stability is improved, but the device structure becomes more complex
Solution Approach 1:
The invention merges the two capacitor structures by sharing a common floating electrode. The first capacitor includes a first plate electrode and a floating electrode, while the second capacitor includes a second plate electrode and the same floating electrode. This merging reduces the number of separate components and simplifies the overall structure while maintaining the floating electrode configuration that provides stable balance characteristics.
3Volume of moving object
If electrode groups are arranged to be overlapped, then the filter size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The invention utilizes the stacking direction (vertical dimension) to arrange electrode groups. The first and second plate electrodes are positioned on different dielectric layers in the stacking direction, creating overlapping electrode groups that form capacitors. This three-dimensional arrangement reduces the planar footprint of the filter while the precise positioning in the stacking direction manages the manufacturing precision requirements.
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 stabilizes the balance characteristic between balanced terminals, reducing phase deviations and allowing for impedance adjustment with minimal insertion loss, while maintaining a compact size.
Implementation Method 1
a capacitor is connected between the first balanced terminal and the second balanced terminal. The capacitor includes a first capacitor and a second capacitor, which are connected in series. The first capacitor includes, as one of opposed electrodes thereof, a first inner-layer plate electrode electrically connected to a terminal electrode defining the first balanced terminal and, as the other of the opposed electrodes, a first floating electrode not connected to a ground.
Data Source
AI summary
A multilayer filter includes a laminate including a plurality of dielectric layers stacked on each other. Inner layer electrodes and outer terminals are provided in the laminate. First and second balanced-side capacitors connected in series between first and second balanced terminals are defined by the inner layer electrodes. An inner-layer plate electrode not connected to any outer terminals is provided on the first dielectric layer. A first plate electrode connected to the first balanced terminal and a second plate electrode connected to the second balanced terminal are provided on the second dielectric layer in opposing relation to the inner-layer plate electrode. The inner-layer plate electrode and the first plate electrode and the first dielectric layer constitute the first balanced-side capacitor, and the inner-layer plate electrode and the second plate electrode and the first dielectric layer constitute the second balanced-side capacitor.