Capacitively Loaded Spurline Filter for Compact Band Rejection
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Solution Overview
Problem
Spurline filters require large sizes to achieve effective band rejection, necessitating a reduction in filter size while maintaining performance.
Innovation Solution
Incorporation of capacitive elements in spurline filters to reduce the layout area by approximately 50% by enhancing coupling effects and adjusting resonant frequencies, allowing for a more compact design without compromising filtering performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spurline filter is configured to be an effective band rejection filter, then the filtering performance is improved, but the filter size becomes large
Solution Approach 1:
The patent changes the electrical parameters of the filter by introducing capacitive elements that modify the resonant frequency and coupling characteristics. This allows the filter to achieve the same band rejection performance with reduced physical dimensions, directly resolving the contradiction between filtering performance and filter size
Solution Approach 2:
The patent transitions from a purely dimensional approach to size reduction by adding electrical dimension through capacitive elements. Instead of simply shrinking the physical structure, the invention uses electrical parameter modification to achieve compactness while maintaining performance
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 capacitive elements enable a significant reduction in filter size while maintaining the same band rejection frequency response as larger spurline filters without capacitive elements, making the design more compact and efficient.
Implementation Method 1
a spurline filter comprises a capacitive element connected to a spur and either a through-line of the spurline filter or ground
Implementation Method 2
The single-resonator spurline filter 100 provides a band rejection notch at a resonant frequency of an incident signal
Data Source
AI summary
In an exemplary embodiment, a spurline filter comprises a capacitive element connected to a spur and either a through-line of the spurline filter or ground. In another embodiment, multiple capacitive elements are connected to the spur. In an exemplary embodiment, the capacitively loaded spurline filter provides a band rejection frequency response similar to the band rejection frequency response of a similar spurline filter that does not comprise at least one capacitive element but the capacitively loaded spurline filter has half the layout area or less. In an exemplary embodiment, the spurline filter comprises capacitive elements, where the capacitive elements are configured to reduce the resonant frequency of the filter.