Balanced Multilayer Filter Layout for Steep Attenuation Poles
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Solution Overview
Problem
Existing balanced multilayer filters struggle to form attenuation poles of desired shapes due to difficulties in adjusting the resonant circuits.
Innovation Solution
A multilayer filter design that includes a conductor unit with first, second, third, and fourth resonant circuits connected to an input/output portion, and a jump capacitor connecting the first and fourth resonant circuits, allowing for magnetic coupling between adjacent resonant circuits to form steep attenuation poles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional resonant circuits are used in balanced multilayer filters, then the filter structure is simple, but it is difficult to adjust the attenuation pole shape
Solution Approach 1:
The filter is divided into multiple resonant circuits (first, second, third, and fourth resonant circuits) with distinct functions. The second and third resonant circuits are configured for magnetic coupling to form attenuation poles, while the first and fourth resonant circuits are connected via jump capacitors for additional attenuation pole shaping. This segmentation allows independent optimization of each circuit's contribution to the overall attenuation characteristic.
Solution Approach 2:
Jump capacitors are introduced as intermediary elements connecting the first and fourth resonant circuits. These jump capacitors enable precise adjustment of the attenuation pole shape by controlling the coupling between resonant circuits without requiring fundamental changes to the filter structure. The capacitors act as可调 parameters to fine-tune the attenuation characteristics.
2Reliability
If multiple resonant circuits are added to form steep attenuation poles, then filtering reliability improves, but device complexity increases
Solution Approach 1:
The second and third resonant circuits are magnetically coupled together to form a unified attenuation pole structure. This magnetic coupling merges the functionality of two separate circuits into a single coherent filtering mechanism, achieving steep attenuation characteristics while avoiding the need for completely separate adjustment mechanisms for each circuit.
Solution Approach 2:
Each resonant circuit is designed to serve multiple purposes: the second and third circuits provide both signal transmission and attenuation pole formation through magnetic coupling, while the first and fourth circuits contribute to both signal transmission and attenuation pole shaping through the jump capacitor connection. This multi-functionality reduces the need for additional dedicated components.
3Volume of moving object
If resonant circuits are arranged to enable magnetic coupling, then compactness is achieved, but adjustment flexibility is reduced
Solution Approach 1:
The filter design incorporates adjustable parameters through the jump capacitors, which allow dynamic tuning of the attenuation pole shape after manufacturing. This dynamic adjustment capability is achieved without changing the physical arrangement of the magnetically coupled resonant circuits, maintaining compactness while providing versatility.
Solution Approach 2:
The capacitance values of the jump capacitors serve as adjustable parameters that directly influence the attenuation pole shape. By changing these electrical parameters rather than physical dimensions, the filter achieves adaptability while maintaining its compact magnetic coupling structure. The inductance values of the resonant circuits also provide additional parameter control.
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 design enables the formation of steep attenuation poles, allowing for more reliable filtering processing and adjustment of the attenuation pole shape, while maintaining compactness and balanced characteristics.
Implementation Method 1
the second resonant circuit and the third resonant circuit are magnetically coupled to each other
Implementation Method 2
The jump capacitor connects the first resonant circuit and the fourth resonant circuit to each other
Data Source
AI summary
In a multilayer filter, first to fourth resonant circuits are connected to an input/output portion. The 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. Each of the first to fourth resonant circuits includes an inductor conductor and first and second capacitor conductors. 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 and third resonant circuits are magnetically coupled to each other. The second and third resonant circuits are arranged between the first resonant circuit and the fourth resonant circuit in a first direction. Each of first and second electrodes of a jump capacitor conductor is connected to the inductor conductors of the first and fourth resonant circuits.