LC Band-Pass Filter Layout for Low Insertion Loss
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Solution Overview
Problem
Existing band pass filters face challenges in efficiently determining pass bands and reducing insertion loss of radio frequency signals due to limitations in resonant frequency design and circuit configurations.
Innovation Solution
A band pass filter design incorporating multiple series and shunt circuit units with LC resonant circuits, where the resonant frequencies of these circuits are strategically positioned to form attenuation regions, thereby determining the pass band and reducing insertion loss by optimizing signal transfer and blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional LC resonant filter configurations are used, then the filter structure is simple, but the insertion loss of radio frequency signals is high and pass band determination is inefficient
Solution Approach 1:
The filter is divided into multiple circuit units, each containing series and parallel LC resonant circuits with specific resonant frequencies. This segmentation allows each unit to contribute to forming attenuation regions at different frequency points, collectively determining the pass band more efficiently while managing complexity through modular design
Solution Approach 2:
Different circuit units are assigned different resonant frequencies (first resonant frequency, second resonant frequency, third resonant frequency) to create localized attenuation regions at specific frequency points. This local quality approach enables precise control over which frequencies are attenuated and which pass through, reducing insertion loss in the desired pass band
2Manufacturing precision
If multiple resonant circuits are added to improve pass band determination, then pass band precision improves, but device complexity increases
Solution Approach 1:
The precision is achieved by segmenting the frequency spectrum into distinct attenuation regions, each created by a specific circuit unit with a designated resonant frequency. This allows precise pass band determination through the coordinated action of multiple specialized units rather than one complex unit
Solution Approach 2:
The filter uses a composite circuit structure combining series LC resonant circuits and parallel LC resonant circuits in specific configurations. This composite approach leverages the different characteristics of series and parallel resonance to create effective attenuation regions while maintaining a manageable number of circuit units
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 proposed design effectively reduces insertion loss and improves the determination of pass bands by utilizing a combination of series and parallel LC resonant circuits, enhancing the filter's performance in wireless communication systems.
Implementation Method 1
An LC resonant filter includes a series LC resonant circuit or a parallel LC resonant circuit, and filters wireless radio frequency signals by series LC resonance or parallel LC resonance
Implementation Method 2
An LC resonant filter includes a series LC resonant circuit or a parallel LC resonant circuit, and filters wireless radio frequency signals by series LC resonance or parallel LC resonance
Data Source
AI summary
A band pass filter includes: a first circuit unit including a first series LC resonant circuit disposed between a first terminal and a second terminal; a second circuit unit disposed between the first circuit unit and the second terminal, and including a first parallel LC resonant circuit; and a third circuit unit disposed between the first terminal and a ground, and including a second series LC resonant circuit, wherein a resonant frequency of the first circuit unit is in a pass band.