Switchable RF Filter Circuit for 5G Broadcast Band Isolation
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Solution Overview
Problem
Existing radio-frequency circuits face interference issues between 5G broadcast signals and cellular communication bands due to overlapping frequency bands, leading to insufficient isolation and increased signal loss.
Innovation Solution
The radio-frequency circuit employs multiple filters with specific pass bands for 5G broadcast and cellular communication, along with switches to selectively connect or disconnect these filters, ensuring a large frequency interval between the 5G broadcast bands and cellular communication bands, using LC and acoustic wave filters to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple filters with overlapping pass bands are used to support both 5G broadcast and cellular communication, then the adaptability and versatility of the radio-frequency circuit is improved, but interference between broadcast signals and cellular signals increases
Solution Approach 1:
The radio-frequency circuit is segmented into multiple independent filter banks, each dedicated to specific frequency bands (broadcast band filter bank and cellular communication band filter bank). This segmentation allows selective activation of appropriate filters based on operational mode, preventing interference between broadcast and cellular signals while maintaining multiband and multimode support capability.
Solution Approach 2:
The circuit employs dynamic switching mechanisms that adaptively connect or disconnect specific filter banks based on the operational mode (broadcast reception or cellular communication). This dynamic reconfiguration enables the same hardware to support multiple functions without simultaneous interference, as only the relevant filter bank is active at any given time.
2Device complexity
If a single antenna is used for both 5G broadcast reception and cellular communication, then the device complexity is reduced, but the isolation between broadcast band and cellular band signals deteriorates
Solution Approach 1:
Multiple switches act as intermediary components between the single antenna and the separate filter banks. These switches dynamically route the antenna connection to either the broadcast band filter bank or the cellular communication band filter bank, providing effective isolation between the two signal paths while maintaining a compact single-antenna configuration.
3Device complexity
If the pass band of a filter includes both broadcast band and cellular communication band, then the device complexity is reduced, but the loss of signal increases due to interference
Solution Approach 1:
The filtering function is segmented into separate broadcast band filters and cellular communication band filters. Each filter is optimized for its specific frequency range, allowing narrowband filtering that minimizes signal loss within the pass band while providing high attenuation for adjacent bands, thereby reducing interference-related signal loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for reduced interference and signal loss, enabling efficient reception of 5G broadcast signals while maintaining high isolation from cellular communication bands, allowing for a compact and low-loss design.
Implementation Method 1
a first filter having a pass band including a first broadcast band for 5G broadcast; a second filter having a pass band including a second broadcast band for 5G broadcast and a first communication band for cellular mobile communication
Data Source
AI summary
A radio-frequency circuit includes first and second filters and a first switch. The first filter has a pass band including a first broadcast band for 5G broadcast. The second filter has a pass band including a second broadcast band for 5G broadcast and a first communication band for cellular mobile communication. The first switch includes first, second, and third terminals. The first switch is configured to connect the first terminal to at least one of the second terminal and the third terminal. The second broadcast band and the first communication band at least partially overlap each other and are positioned at a high frequency side or a low frequency side of the first broadcast band. The first filter is connected to the second terminal. The second filter is connected to the third terminal.