RF Resonant Filter Circuit With Phase Shifted Impedance Paths
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Solution Overview
Problem
Existing radio communication technologies face challenges in effectively filtering signals to improve signal-to-noise ratio, particularly in managing frequency bands to achieve desired impedance characteristics for band-stop and band-pass filters.
Innovation Solution
The implementation of circuitry comprising resonant radio frequency conductive paths, a shunt resonant element, and a phase shift element to create frequency selective impedance, allowing for the creation of band-stop and band-pass filters with controlled phase shifts and impedance paths, enabling precise filtering of signals within specific frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional filtering methods are used to improve signal-to-noise ratio, then filtering performance is limited, but device complexity increases when adding multiple filters
Solution Approach 1:
The patent combines multiple filter functions (band-stop and band-pass filtering) into a single integrated circuit structure. The first and second resonant radio frequency conductive paths share common nodes and the shunt resonant element, creating a unified filter that performs multiple filtering operations simultaneously, eliminating the need for separate filter components
Solution Approach 2:
The filter circuit is designed to provide multiple filtering capabilities through a single structure. By configuring the resonant paths and phase shift elements appropriately, the same circuit can function as both a band-stop filter and a band-pass filter, making the device multi-functional and reducing overall system complexity
2Manufacturing precision
If frequency selective impedance is used to achieve precise filtering, then filtering precision improves, but circuit complexity increases
Solution Approach 1:
The filter circuit is segmented into distinct functional components: resonant radio frequency conductive paths for frequency selection, a shunt resonant element for impedance control, and phase shift elements for phase manipulation. This segmentation allows each component to be optimized independently while maintaining overall filtering precision
Solution Approach 2:
The circuit incorporates controllable phase shift elements that can dynamically adjust the phase relationship between different resonant paths. This dynamic control enables precise tuning of the filter characteristics and impedance matching without requiring complex static circuit designs
3Manufacturing precision
If multiple resonant paths are used to achieve controlled impedance characteristics, then impedance control improves, but device complexity increases
Solution Approach 1:
Multiple resonant paths are merged into a single integrated circuit structure that shares common nodes and components. The first and second resonant paths both connect to the same shunt resonant element and intermediate nodes, allowing coordinated impedance control through unified circuit design rather than separate independent circuits
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 solution effectively enhances the signal-to-noise ratio by providing filters with adjustable bandwidth and impedance characteristics, achieving improved filtering performance across various frequency bands, as demonstrated by the operational bandwidth between 4.95 GHz and 5.2 GHz with -20 dB to -40 dB response.
Implementation Method 1
a shunt resonant element coupled to the third node and shared by the first resonant radio frequency conductive path and the second resonant radio frequency conductive path
Implementation Method 2
a phase shift element for introducing a relative phase shift to the first resonant radio frequency conductive path relative to the second resonant radio frequency conductive path
Data Source
AI summary
Circuitry comprising: a first resonant radio frequency conductive path between a first node and a third node; a second resonant radio frequency conductive path between a second node and the third node; an internode radio frequency conductive path between the first node and the second node; a shunt resonant element coupled to the third node and shared by the first resonant radio frequency conductive path and the second resonant radio frequency conductive path; and a phase shift element for introducing a relative phase shift to the first resonant radio frequency conductive path relative to the second resonant radio frequency conductive path.