Radio Frequency Module Duplexer Stacking for Signal Isolation
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Solution Overview
Problem
In small-sized radio frequency front-end circuits of mobile communication devices, radio frequency signals from different frequency bands interfere with each other, leading to deterioration of signal isolation due to magnetic, electric, or electromagnetic coupling between duplexers, which affects transmission and reception quality.
Innovation Solution
A radio frequency module is designed with duplexers for different communication bands placed on opposite sides of a module board, reducing magnetic, electric, and electromagnetic coupling by separating the signal paths, thereby improving isolation between simultaneously transmitted, received, or transmitted-and-received signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple duplexers for different frequency bands are integrated in a small-sized radio frequency front-end circuit, then the device size is reduced and multi-band functionality is achieved, but magnetic field coupling, electric field coupling, or electromagnetic field coupling occurs between duplexers, causing deterioration of isolation between simultaneously transmitted or received radio frequency signals
Solution Approach 1:
The patent applies dimensionality change by transitioning from planar arrangement to three-dimensional stacked arrangement. Multiple duplexers are arranged in different layers along the vertical direction, with alternating duplexers for first and second frequency bands positioned at different heights. This spatial separation in the vertical dimension reduces electromagnetic coupling while maintaining compact overall volume, effectively resolving the contradiction between small device size and good signal isolation.
2Ease of manufacture
If duplexers for different frequency bands are placed close together to achieve compact form factor, then manufacturing cost and device size are reduced, but interference between radio frequency signals increases due to coupling effects
Solution Approach 1:
The patent introduces ground electrodes as intermediary elements positioned between adjacent duplexers in the stacked arrangement. These ground electrodes act as shielding barriers that block or reduce electromagnetic field coupling between duplexers operating at different frequency bands. This intermediary structure enables close placement of duplexers for compact manufacturing while simultaneously preventing harmful signal interference through electromagnetic shielding.
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 effectively reduces interference and maintains signal quality by minimizing coupling between duplexers, allowing for improved isolation and efficient simultaneous operation of multiple radio frequency signals in a compact form factor.
Implementation Method 1
the isolation between the first reception signal and the second reception signal deteriorates due to magnetic field coupling, electric field coupling, or electromagnetic field coupling between a first duplexer that passes the first reception signal and a second duplexer that passes the second reception signal
Implementation Method 2
the isolation between the first reception signal and the second reception signal deteriorates due to magnetic field coupling, electric field coupling, or electromagnetic field coupling between a first duplexer that passes the first reception signal and a second duplexer that passes the second reception signal
Implementation Method 3
the isolation between the first reception signal and the second reception signal deteriorates due to magnetic field coupling, electric field coupling, or electromagnetic field coupling between a first duplexer that passes the first reception signal and a second duplexer that passes the second reception signal
Data Source
AI summary
A radio frequency module is capable of at least one of simultaneously transmitting, simultaneously receiving, or simultaneously transmitting and receiving a radio frequency signal of a first communication band and a radio frequency signal of a second communication band. The radio frequency module includes: a module board including a first principal surface and a second principal surface on opposite sides of the module board; a first duplexer having, as pass bands, a transmission band and a reception band of the first communication band; and a second duplexer having, as pass bands, a transmission band and a reception band of the second communication band. The first duplexer is disposed on the first principal surface and the second duplexer is disposed on the second principal surface.