RF Module 3D Stacking for Signal Isolation
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Solution Overview
Problem
In mobile communication devices, the close proximity of signal paths in a small-sized front-end circuit leads to deteriorated isolation between the input and output of transmission power amplifiers, causing unstable operation due to feedback loops of unnecessary radio frequency signals.
Innovation Solution
The radio frequency module is configured with the transmission power amplifier on one principal surface of the module board and the switch on the opposing surface, reducing electric field, magnetic field, or electromagnetic field coupling between the signal paths, thereby inhibiting feedback loops and stabilizing the transmission power amplifier operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the front-end circuit is configured in a small-sized single module, then the device size is reduced, but the isolation between the input and output signal paths deteriorates
Solution Approach 1:
The patent applies three-dimensional stacking by placing the switch and transmission power amplifier on opposite surfaces of the module board. This spatial separation in the vertical dimension (z-axis) effectively isolates the input and output signal paths while maintaining a compact footprint, resolving the contradiction between small size and good isolation.
2Device complexity
If the switch and transmission power amplifier are placed close to each other on the same surface, then the device complexity is reduced, but feedback loops form causing unstable operation
Solution Approach 1:
By moving the switch to the opposite surface of the module board relative to the transmission power amplifier, the patent creates physical separation that breaks potential feedback loops. This dimensional separation maintains circuit functionality while eliminating instability caused by unwanted signal coupling.
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 unstable operations of the transmission power amplifier by improving isolation between the input and output signal paths, enhancing the stability and performance of the radio frequency module in mobile communication devices.
Implementation Method 1
a switch configured to connect and disconnect the transmission input terminal and the first transmission amplifier
Implementation Method 2
a first transmission amplifier configured to amplify a transmission signal input through the transmission input terminal
Data Source
AI summary
A 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 transmission input terminal; a first transmission amplifier disposed on the first principal surface that amplifies a transmission signal input through the transmission input terminal; and a first switch disposed on the second principal surface that connects and disconnects the transmission input terminal and the first transmission amplifier.