Multiplexer Filter Layout for Independent Attenuation Pole Tuning
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Solution Overview
Problem
Designing filters with multiple parallel resonance circuits to achieve desired frequency characteristics is complicated due to interdependent attenuation pole frequencies, making it difficult to independently adjust and optimize the frequency response.
Innovation Solution
A filter design featuring multiple sets of capacitors and inductors with specific connections and magnetic couplings allows for independent adjustment of attenuation pole frequencies, using a laminated structure with dielectric layers and conductor patterns to form parallel resonance circuits that can be tuned for desired frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple parallel resonance circuits are used to form multiple attenuation poles, then the filter can achieve desired frequency characteristics, but the design becomes complicated because changing the frequency of some attenuation poles also changes the frequencies of other attenuation poles
Solution Approach 1:
The filter is divided into multiple independent parallel resonance circuits, each responsible for forming a specific attenuation pole. By segmenting the filter into separate functional units (first parallel resonance circuit for first attenuation pole, second parallel resonance circuit for second attenuation pole), each circuit can be designed and adjusted independently without affecting the others, thus resolving the interdependence problem while maintaining precise frequency characteristics
Solution Approach 2:
Each parallel resonance circuit is designed with specific local characteristics (different inductance and capacitance values) to achieve different attenuation pole frequencies. The first parallel resonance circuit has different component values than the second parallel resonance circuit, allowing each to perform its specific function of creating a distinct attenuation pole at the desired frequency without interfering with other circuits
2Manufacturing precision
If the frequencies of attenuation poles are adjusted independently, then the filter can achieve desired frequency characteristics, but the filter size increases
Solution Approach 1:
Multiple parallel resonance circuits are merged into a single filter structure sharing common terminals (input terminal, output terminal, and ground terminal). The first and second parallel resonance circuits are combined in parallel between the input and output terminals, allowing independent frequency adjustment while maintaining a compact overall filter size rather than requiring separate filters for each attenuation pole
Solution Approach 2:
Each parallel resonance circuit serves multiple functions: it forms a specific attenuation pole, provides frequency selectivity, and contributes to the overall filtering characteristic. The shared terminals allow all circuits to work together universally toward achieving the desired frequency response while maintaining a compact design
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 design enables precise control over the frequency characteristics of the filter, allowing for independent setting of attenuation pole frequencies without compromising the overall frequency response or increasing filter size.
Implementation Method 1
a filter having a plurality of parallel resonance circuits between a path for transmitting a high frequency signal and a ground terminal
Implementation Method 2
a plurality sets of first capacitors that include first ends connected to a plurality sets of first nodes
Implementation Method 3
a plurality sets of first inductors that include third ends connected to the first nodes
Data Source
AI summary
A filter includes an input terminal, an output terminal, a plurality sets of first capacitors that include first ends connected to a plurality sets of first nodes, respectively, at different locations in a path capable of transmitting a high frequency signal from the input terminal to the output terminal, and second ends commonly connected to a second node, a plurality sets of first inductors that include third ends connected to the first nodes, respectively, and the fourth ends commonly connected to a third node, a second inductor that includes a fifth end connected to the second node, and a sixth end grounded, and a third inductor that includes a seventh end connected to the third node, and an eighth end grounded.