RF Circuit Segmentation for 4G-5G Intermodulation Distortion
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Solution Overview
Problem
Existing radio frequency circuits face challenges in reducing intermodulation distortion when simultaneously transmitting radio frequency signals from multiple communication systems, such as 4G and 5G, due to adjacent transmission bands without receiving bands, leading to decreased receiving sensitivity.
Innovation Solution
A radio frequency circuit configuration with separate transfer circuits for each communication system, mounted on different boards, ensures high isolation between signals by using distinct duplexer filters and antennas, allowing for simultaneous transmission while minimizing intermodulation distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transfer circuit simultaneously transmits radio frequency signals from multiple communication systems with adjacent transmission bands, then device complexity is reduced, but isolation between signals deteriorates leading to intermodulation distortion
Solution Approach 1:
The patent divides the transfer circuit into separate first and second transfer circuits, each dedicated to a specific communication system (4G and 5G respectively). This segmentation allows independent optimization of each circuit for its specific frequency band, preventing intermodulation distortion that would occur in a shared circuit while managing overall system complexity.
2Adaptability or versatility
If transmission bands of different communication systems are adjacent without receiving bands between them, then frequency spectrum utilization is improved, but receiving sensitivity deteriorates due to intermodulation distortion
Solution Approach 1:
By segmenting the transfer circuits into separate first and second transfer circuits for adjacent transmission bands, the patent enables high isolation between the 4G and 5G signals. This prevents intermodulation distortion from degrading receiving sensitivity while maintaining efficient frequency spectrum utilization with adjacent bands.
Solution Approach 2:
The patent introduces separate transfer circuits as intermediary components between the adjacent transmission bands of different communication systems. These intermediary circuits provide the necessary isolation and filtering to prevent harmful interactions while allowing both systems to operate simultaneously with high receiving sensitivity.
3Object-generated harmful factors
If separate transfer circuits are used for each communication system, then isolation between signals is improved reducing intermodulation distortion, but device complexity increases
Solution Approach 1:
The patent applies segmentation by creating separate first and second transfer circuits for different communication systems. This segmentation achieves high isolation and eliminates intermodulation distortion while managing complexity through modular design where each circuit is optimized for its specific function.
Data Source
AI summary
A radio frequency circuit can transfer radio frequency signals used in first and second communication systems, and includes: a first transfer circuit that transfers a radio frequency signal having a frequency range in a first communication band having first transmission and receiving bands; and a second transfer circuit that transfers a radio frequency signal having a frequency range in a second communication band having second transmission and receiving bands. The radio frequency circuit can simultaneously transmit transmission signals having frequency ranges in the first and second communication bands using the first and second transfer circuits. The first receiving band is lower than the first transmission band, the first transmission band is lower than the second transmission band, and the second transmission band is lower than the second receiving band. The first and second transfer circuits are mounted on different mounting boards.