RF Front-End Shielding Layout for Tx-Rx Inductor Coupling
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Solution Overview
Problem
In compact mobile communication devices, electromagnetic field coupling between inductance components of transmission and reception circuits in radio frequency front-end circuits leads to reduced reception sensitivity due to harmonic and intermodulation distortion components from high-power radio frequency signals.
Innovation Solution
A radio frequency module configuration with a module board featuring conductive members, such as duplexers or metal chips, strategically placed between inductance elements of the transmission and reception matching circuits to block electromagnetic fields, preventing coupling and thus reducing harmonic and intermodulation distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the transceiver is implemented in a single module as a compact front-end circuit, then the device size is reduced, but electromagnetic field coupling occurs between inductance components of the transmitter and receiver, deteriorating reception sensitivity
Solution Approach 1:
A conductive member (shielding structure) is introduced as an intermediary element between the transmitter output inductance and the receiver input inductance. This conductive member acts as a barrier that blocks electromagnetic field coupling while allowing the compact single-module configuration to be maintained, thus preventing harmful interference without increasing overall module size
Solution Approach 2:
The internal layout of the module is segmented into distinct transmission and reception regions. The conductive member divides the module board into separate zones, spatially isolating the transmitter and receiver circuits to prevent electromagnetic coupling while maintaining the integrated module structure
2Device complexity
If multiple transmitters and receivers are integrated in a single module, then device complexity is reduced, but harmonic and intermodulation distortion components from high-power transmission signals interfere with reception signals, reducing reception sensitivity
Solution Approach 1:
The conductive member serves as a shielding intermediary that blocks the propagation of harmonic and intermodulation distortion components generated by the high-power transmission signals. This prevents these harmful frequency components from coupling into the receiver input, allowing multiple transmitters and receivers to be integrated without mutual interference
Solution Approach 2:
The conductive shielding is applied locally at the critical interface between transmission and reception circuits, specifically around the inductance components where electromagnetic coupling occurs. This targeted approach provides effective isolation without requiring comprehensive shielding throughout the entire module
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 prevents electromagnetic field coupling, enhancing the reception sensitivity of the radio frequency module by blocking harmonic and intermodulation distortion components.
Implementation Method 1
a conductive member mounted on the first principal surface is disposed between the first inductance element and the second inductance element
Data Source
AI summary
A radio frequency module includes a module board, a transmission power amplifier, a first inductance element mounted on a first principal surface and connected to an output terminal of the transmission power amplifier, a reception low-noise amplifier, and a second inductance element mounted on a first principal surface connected to an input terminal of the reception low-noise amplifier. In a plan view of the module board, a conductive member mounted on the first principal surface is disposed between the first inductance element and the second inductance element.