Bridge Combiner Multiplexer Layout for RF Band Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In radio-frequency (RF) applications, existing technologies face challenges in efficiently routing signals between different frequency bands, leading to impedance mismatch issues that affect signal exclusion and isolation between paths, particularly in carrier aggregation operations.
Innovation Solution
The implementation of a radio-frequency architecture that includes two groups of filters, each configured to provide impedance at or near short circuit conditions for signals in the other group's frequency range, using multiplexers and a coupling circuit with a common node to ensure signal exclusion between paths, and potentially incorporating phase shifters for improved isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing routing technologies are used for RF signals, then signal routing between frequency bands is achieved, but impedance mismatch issues occur that affect signal exclusion and isolation between paths
Solution Approach 1:
The patent introduces bridge combiners and multiplexers as intermediary devices between different signal paths. These components act as mediators that provide proper impedance transformation and matching, enabling effective signal exclusion and isolation between different frequency bands while maintaining system reliability.
Solution Approach 2:
The patent employs phase shifters and impedance transformation networks that dynamically adjust electrical parameters (phase, impedance) to maintain proper matching conditions. By changing these parameters adaptively, the system achieves reliable signal isolation without requiring overly complex fixed impedance matching structures.
2Reliability
If bridge combiners and multiplexers are implemented with multiple filters, then signal isolation between paths is improved, but the device complexity increases
Solution Approach 1:
The patent divides the filtering function into two distinct groups: a first group of filters for first frequency ranges and a second group of filters for second frequency ranges. This segmentation allows each filter group to be optimized for its specific frequency band, improving signal isolation while making the overall complex system more manageable through functional decomposition.
Solution Approach 2:
The bridge combiner structure is designed to handle multiple frequency bands simultaneously using two groups of filters. This multi-functional design allows a single device to perform carrier aggregation across different bands, reducing the need for separate routing devices for each band and thereby managing complexity through consolidation of multiple functions.
3Reliability
If filters are configured to provide short circuit impedance for other group's bands, then signal exclusion from unintended paths is achieved, but the circuit design complexity increases
Solution Approach 1:
Each filter is designed with specific local characteristics tailored to its function: filters in the first group are optimized to provide short circuit impedance specifically for frequencies in the second group's range, and vice versa. This localized optimization of filter properties enables effective signal exclusion while maintaining manufacturability through standardized filter design approaches for each frequency range.
Data Source
AI summary
An architecture can include a first group of filters each configured to support a band such that a first frequency range covers the respective bands, and a second group of one or more filters each configured to support a band such that a second frequency range covers the respective one or more bands. Each filter of the first group can be configured to provide an impedance at or near a short circuit impedance for a signal in each band of the second group, and each filter of the second group can be configured to provide an impedance at or near a short circuit impedance for a signal in each band of the first group. The filters of the first and second groups can be implemented as one or more multiplexers. The architecture can further include a coupling circuit having a common node and configured to couple the common node to the one or more multiplexers through a first path and a second path. The coupling circuit can be further configured such that the impedance provided by each filter of the first group for the signal in each band of the second group results in the signal being sufficiently excluded from the first path, and such that the impedance provided by each filter of the second group for the signal in each band of the first group results in the signal being sufficiently excluded from the second path.