Signal Splitter Combiner for Wireless Filter Isolation
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Solution Overview
Problem
In wireless communication systems, existing technologies face challenges in effectively isolating uplink and downlink signals, particularly in scenarios with narrow guard bands, leading to increased costs due to steep roll-off requirements for filters.
Innovation Solution
The use of a signal splitter/combiner to provide isolation between uplink and downlink paths and filters, reducing the need for expensive components and minimizing roll-off requirements by directing unwanted signals away from specific circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If narrow guard bands are used to separate frequency bands, then frequency spectrum utilization is improved, but signal isolation between bands deteriorates
Solution Approach 1:
A signal splitter/combiner is introduced as an intermediary component between filters operating on different frequency bands. This mediator directs signals from the first frequency band away from the second filter and directs signals from the second frequency band away from the first filter, preventing interference even when guard bands are narrow.
2Object-affected harmful factors
If steep roll-off filters are used to achieve signal isolation, then signal isolation is improved, but device complexity and cost increase
Solution Approach 1:
The signal splitter/combiner acts as a mediator that performs the isolation function, allowing the use of filters with gentler roll-off characteristics. The splitter/combiner directs signals away from inappropriate filters, achieving isolation without requiring complex steep roll-off filter designs.
3Object-affected harmful factors
If steep roll-off filters are used to achieve signal isolation, then signal isolation is improved, but component cost increases
Solution Approach 1:
By introducing the signal splitter/combiner as an intermediary, the system can use less expensive filters with moderate roll-off characteristics. The splitter/combiner handles the critical isolation function, reducing the cost burden on individual filter components.
4Device complexity
If signals from different frequency bands are processed together, then device complexity is reduced, but signal processing quality deteriorates
Solution Approach 1:
The signal processing system is segmented into separate paths for different frequency bands, with the signal splitter/combiner directing first band signals away from the second filter and second band signals away from the first filter. This segmentation maintains signal processing quality while managing system complexity.
Data Source
AI summary
According to some embodiments described herein, a system of providing filter isolation may include a first filter configured to pass a first frequency range and a second filter configured to pass a second frequency range. The system may also include a signal splitter/combiner communicatively coupled to the first filter at a first port of the signal splitter/combiner and communicatively coupled to the second filter at a second port of the signal splitter/combiner. The signal splitter/combiner may be configured to receive a first signal filtered by the first filter at the first port of the signal splitter/combiner. The signal splitter/combiner may also be configured to direct the first signal from the first port to a third port of the signal splitter/combiner and away from the second port such that the signal splitter/combiner directs the first signal away from the second filter.