RF System Four Antennas Dual Low-Band Connectivity
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Solution Overview
Problem
Current 4G RF systems are limited to single-band operation and lack efficient dual-connection capabilities, making it difficult to achieve reliable uplink signals in small-sized electronic devices due to space constraints and antenna efficiency issues.
Innovation Solution
The implementation of an RF system using four antennas to support dual connection of two low-frequency bands, with two antennas having higher efficiency for uplink signal distribution, allowing for simultaneous transmission and reception in both bands, and employing a filtering module to filter out non-target bands in non-standalone mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-antenna or dual-antenna RF system architecture is adopted, then the device complexity is reduced, but the reliability of uplink signals deteriorates due to inability to support dual connection of multiple low-frequency bands
Solution Approach 1:
The patent divides the RF system into multiple independent antenna modules, each dedicated to specific low-frequency bands. Four antennas are segmented to support dual connection of first and second low-frequency bands, with each antenna having specialized functionality for specific band combinations, thereby improving reliability without excessive complexity
Solution Approach 2:
The patent implements a universal RF system architecture where four antennas can be flexibly configured to support multiple low-frequency bands simultaneously. The transfer switch module enables universal connectivity between antennas and RF processing circuits, allowing the system to adapt to different band combinations while maintaining reliable uplink signals
2Reliability
If four antennas are used to support dual connection of two low-frequency bands, then the reliability of uplink signals is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple antenna functions into a unified RF system architecture. Four antennas are combined with a common transfer switch module and RF processing circuits, allowing the system to manage multiple low-frequency bands through a consolidated structure rather than separate independent systems, thereby reducing overall complexity
Solution Approach 2:
The patent introduces a transfer switch module that dynamically configures antenna connections based on the operating band and mode. The switch can dynamically connect different antennas to different RF processing circuits depending on whether the system operates in standalone or non-standalone mode, enabling flexible adaptation without fixed complex wiring for all scenarios
3Reliability
If two antennas with higher efficiency are used for uplink signal distribution, then the antenna efficiency is improved, but the adaptability to different operating modes deteriorates
Solution Approach 1:
The patent employs a transfer switch module that dynamically reconfigures antenna connections based on operating mode. In standalone mode, the system can utilize two high-efficiency antennas for optimal uplink performance. In non-standalone mode, the switch dynamically connects antennas to support dual connection of different low-frequency bands, thereby maintaining adaptability while preserving antenna efficiency through intelligent switching
Solution Approach 2:
The system changes the operational parameters of antenna connections based on the operating mode. The transfer switch module modifies the connectivity parameters between antennas and RF processing circuits, allowing the same physical antenna structure to optimize performance for different operating scenarios - whether single-band standalone operation or dual-band non-standalone operation
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 ensures reliable uplink signals by optimizing antenna efficiency and enabling dual-band operation in a compact form factor, enhancing the performance of electronic devices in 4G and 5G networks.
Implementation Method 1
the filtering module is configured to filter out bands other than the first LB, when the RF system works in a non-standalone (NSA) mode
Data Source
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AI summary
A radio frequency (RF) system and an electronic device are provided. The RF system includes an RF transceiver, an RF processing circuit coupled with the RF transceiver, a transfer switch module, a first antenna, a second antenna, a third antenna, and a fourth antenna. The RF processing circuit comprises a first transmit (TX) module, a second TX module, a first receive (RX) module, a second RX module, a first duplexer, a second duplexer, and a filtering module. The first antenna is used for transmission in a first low-band (LB) and primary reception in the first LB, the second antenna is used for transmission in a second LB and primary reception in the second LB, the third antenna is used for diversity reception in the second LB, the fourth antenna is used for diversity reception in the first LB, and the filtering module is configured to filter out bands other than the first LB, when the RF system works in a non-standalone (NSA) mode.