Segmented RF Filter Circuit Reduces Insertion Loss
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Solution Overview
Problem
Radio-frequency (RF) devices face challenges in reducing filter insertion loss while maintaining out-of-band attenuation, as existing designs often compromise on either insertion loss or attenuation due to constraints in passband bandwidth and duplexer gap, leading to suboptimal performance.
Innovation Solution
The implementation of segmented filter circuits that cover multiple frequency bands, allowing for a desired level of out-of-band attenuation and insertion loss, with a receive-only duplexer configuration and diversity receive circuit to manage Tx and Rx signals effectively, and a bypass circuit to optimize signal paths for reduced insertion loss and improved isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single filter circuit covers the entire passband, then out-of-band attenuation is maintained, but insertion loss increases
Solution Approach 1:
The filter circuit is divided into multiple segments, each covering a specific frequency portion of the passband. This segmentation allows each filter segment to be optimized for lower insertion loss while collectively providing the required out-of-band attenuation when combined with the duplexer configuration.
2Adaptability or versatility
If passband bandwidth is increased, then frequency coverage is improved, but insertion loss increases
Solution Approach 1:
The wide passband is divided into multiple narrower frequency segments, each handled by a separate filter circuit. This allows the system to cover a wide frequency range while maintaining low insertion loss in each segment, as narrower filters inherently have lower insertion loss.
3Device complexity
If duplexer gap is reduced, then device complexity is reduced, but out-of-band attenuation deteriorates
Solution Approach 1:
The duplexer operates with reduced gap between transmit and receive bands, but the filter circuits are segmented to provide targeted attenuation at specific out-of-band frequencies. This segmentation compensates for the reduced duplexer gap, maintaining out-of-band attenuation performance while reducing overall device complexity.
Solution Approach 2:
Instead of providing uniform attenuation across all out-of-band frequencies through a large duplexer gap, the segmented filter circuits provide localized attenuation at specific critical frequencies. This local quality approach maintains necessary attenuation performance while allowing smaller duplexer gap.
Data Source
AI summary
Disclosed are systems and methods for reducing filter insertion loss while maintaining out-of-band attenuation. In some embodiments, a system can be configured for processing of radio-frequency (RF) signals. The system can include a plurality of signal paths configured to accommodate multiple frequency bands, with each of the multiple bands having a passband. The system can further include a filter circuit disposed along each of the signal paths. At least one of the filter circuits can be segmented into two or more segments that substantially cover the passband corresponding to the filter circuit. The segmented filter circuit can be configured to provide a desired attenuation of out-of-band interferers and a desired insertion loss level. In some embodiments, the signal paths can include receive (Rx) paths.