RF Front-End Switch Topology for 1TNR Antenna Isolation
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Solution Overview
Problem
Existing RF front-end modules in 5G mobile terminals suffer from poor signal isolation between multiple antennas, leading to interference when receiving RF signals simultaneously.
Innovation Solution
The RF front-end module incorporates a novel antenna switch selection module with multiple switch circuits and pull-down switches to independently manage RF signal transmitting and receiving links, ensuring isolation by grounding unused ports and using matching resistors for impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antennas are used to transmit and receive RF signals simultaneously in 1TNR mode, then the channel capacity is greatly improved, but the isolation effect between multiple RF signals at the antenna switch selection module is poor, leading to signal interference
Solution Approach 1:
The patent divides the antenna switch selection module into multiple independent switch circuits, with each switch circuit dedicated to controlling a specific antenna connection. This segmentation allows independent control of each antenna's signal path, preventing signal interference while maintaining multi-antenna operation for high channel capacity.
Solution Approach 2:
The patent introduces additional switch circuits as intermediary components between the antenna ports and the RF signal processing paths. These intermediary switch circuits act as mediators that selectively connect or disconnect antenna signals, enabling isolation between multiple RF signals while preserving the ability to receive signals from multiple antennas simultaneously.
2Device complexity
If the antenna switch selection module uses a simple switch circuit structure, then the device complexity is reduced, but the isolation effect between RF signals received by different antennas is poor
Solution Approach 1:
The patent segments the switch circuit into multiple independent switch circuits, one for each antenna connection. Although this increases the number of components, each individual switch circuit remains simple in structure, achieving effective signal isolation without requiring complex integrated switching mechanisms.
Solution Approach 2:
The patent applies local quality by making each switch circuit independently controllable and optimized for its specific antenna connection. Each switch circuit has dedicated control logic and connection paths tailored to its function, allowing precise local control of signal isolation while keeping each individual circuit simple and manageable.
Data Source
AI summary
In order to solve the problem that signals often interfere with one another in the RF front-end module in the prior art, the application provides an RF front-end module, an antenna device and a control method for the RF front-end module. The module comprises an antenna switch selection module, an RF signal transmitting link, a first RF signal receiving link and a second RF signal receiving link; the RF signal transmitting link, first RF signal receiving link and second RF signal receiving link are separately connected to a first inner peripheral port, second inner peripheral port and third inner peripheral port respectively. The antenna device and RF front-end module thereof improve the isolation effect. When the RF front-end circuit receives a plurality of RF signals at the same time, the isolation among different RF signals at the antenna switch selection module is higher than that in the prior art.