Suppression Ring Filter Circuit for Out-of-Band Rejection
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Solution Overview
Problem
Existing filters in radio frequency systems struggle to effectively improve out-of-band rejection performance, which is crucial for the overall communication system performance.
Innovation Solution
A filter circuit comprising a filter and a suppression ring, where the suppression ring is arranged around the periphery of the filter, and each grounded port of the filter is electrically connected to the suppression ring before grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional filter structures are used, then the device complexity is low, but the out-of-band rejection performance is insufficient
Solution Approach 1:
The suppression ring acts as an intermediary component between the filter and ground, providing an additional path for out-of-band signal suppression. The ring is electrically connected to the filter's grounded ports and to ground through inductors, creating a mediator structure that enhances rejection performance without directly modifying the filter's core functionality
Solution Approach 2:
The grounding path is segmented into two parts: the direct ground connection at the filter's grounded ports, and the suppressed grounding path through the suppression ring and inductors. This segmentation allows different frequencies to be handled differently, with out-of-band signals being suppressed by the inductive path while in-band signals maintain their normal grounding
2Reliability
If the suppression ring is added around the filter periphery, then the out-of-band rejection capability is greatly improved, but the device complexity increases
Solution Approach 1:
The suppression ring serves multiple functions: it provides electromagnetic shielding around the filter periphery, creates an additional suppression path for out-of-band signals, and works cooperatively with the inductors to enhance rejection performance. This multi-functionality justifies the added complexity by delivering multiple benefits from a single structural addition
Data Source
AI summary
The present disclosure provides a filter circuit and an electronic device, and relates to the field of filters. The filter circuit can include a filter and a suppression ring, the suppression ring can be arranged around a periphery of the filter, the filter can include several grounded ports, each of grounded ports can be electrically connected to the suppression ring, and each of grounded ports can be grounded. The out-of-band rejection capability of the filter can be greatly improved by providing the suppression ring on the periphery of the filter and connecting each of grounded ports to the suppression ring before grounding.