RF Filter Switching for Overlapping Multi-Band Communication
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Solution Overview
Problem
Existing radio-frequency circuits face limitations in simultaneously processing signals from frequency bands that do not fully overlap, restricting flexibility in communication capabilities.
Innovation Solution
A radio-frequency circuit design incorporating multiple filters and switches that allow for selective connection of band pass and band elimination filters, enabling simultaneous communication across overlapping and non-overlapping frequency bands through mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a band pass filter and a band elimination filter are combined with overlapping frequency bands, then the radio-frequency circuit can simultaneously process signals in overlapping and non-overlapping frequency bands, but the flexibility of combinations of frequency bands for simultaneous communication is restricted
Solution Approach 1:
The radio-frequency circuit is divided into multiple independent filter banks, where each filter bank contains a band pass filter and a band elimination filter with overlapping frequency bands. Each filter bank can be independently configured and switched, allowing flexible selection of frequency band combinations for simultaneous communication without the restrictions of a single fixed filter configuration.
Solution Approach 2:
Switches are introduced to dynamically reconfigure the filter connections, enabling the circuit to switch between different filter bank combinations based on the required frequency bands. This dynamic reconfiguration allows the system to adapt to various communication scenarios with different frequency band requirements, significantly improving the flexibility of frequency band combinations.
2Reliability
If filters are configured for specific frequency bands, then signal processing in those bands is optimized, but the ability to communicate in different frequency band combinations is limited
Solution Approach 1:
Each filter bank is designed with universal characteristics where the band pass filter and band elimination filter have overlapping frequency bands that can serve multiple purposes. The same filter bank can be used for different frequency band combinations by switching, allowing the system to maintain high signal processing quality across multiple frequency band scenarios without requiring dedicated filters for each combination.
Solution Approach 2:
The system changes the operational parameters by switching between different filter bank configurations. Each filter bank has specific frequency characteristics, but by changing which filter banks are active and how they are connected through the switches, the system can optimize signal processing for different frequency band combinations while maintaining high reliability in each specific configuration.
Data Source
AI summary
A radio-frequency circuit includes a first switch, a first filter, a second filter, a third filter, and a fourth filter. The first switch is capable of selectively connecting a first selection terminal or a second selection terminal to a first common terminal. The first filter and the second filter are connected to the first selection terminal. The third filter and the fourth filter are connected to the second selection terminal. The first filter and the third filter are band pass filters. The second filter is a band elimination filter. A pass band of the first filter and a rejection band of the second filter overlap each other. The pass band of the first filter and a pass band of the third filter overlap each other.