RF Module Vertical Component Placement for Isolation
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Solution Overview
Problem
In small-sized radio frequency modules, electromagnetic coupling between the reception low noise amplifier or switch and the inductor or capacitor of the LC filter leads to deterioration of isolation between transmission and reception signals, causing harmonic interference and spurious waves to flow into the reception path, which reduces reception sensitivity.
Innovation Solution
The radio frequency module is configured with the LC filter on one principal surface and the reception low noise amplifier and switch on the opposite surface, utilizing the module board's electromagnetic-field shielding function to reduce coupling, and the external-connection terminals are disposed to inhibit noise, enhancing heat dissipation and reducing the component layout area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the LC filter and reception low noise amplifier are disposed close to each other on the same surface to reduce layout area, then the component layout area is reduced, but electromagnetic coupling occurs between the reception low noise amplifier and the inductor or capacitor of the LC filter, causing deterioration of isolation between transmission and reception signals
Solution Approach 1:
The patent applies dimensionality change by disposing the LC filter on the first principal surface and the reception low noise amplifier on the second principal surface (opposite surfaces) of the module board. This spatial separation in the vertical dimension effectively reduces electromagnetic coupling between the components while maintaining a compact overall layout, thus resolving the contradiction between minimizing layout area and preventing electromagnetic interference.
2Object-affected harmful factors
If the LC filter and reception low noise amplifier are separated to reduce electromagnetic coupling, then isolation between transmission and reception signals is improved, but the component layout area increases
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension (opposite surfaces of the module board) for component separation. The LC filter is placed on the first principal surface while the reception low noise amplifier is placed on the second principal surface, achieving effective electromagnetic isolation without increasing the horizontal footprint of the module.
3Volume of stationary object
If multiple circuit elements are integrated on a small-sized module board to reduce module size, then the module size is reduced, but electromagnetic coupling between circuit elements increases, causing deterioration of reception sensitivity
Solution Approach 1:
The patent applies dimensionality change by strategically placing the LC filter on the first principal surface and the reception low noise amplifier on the second principal surface of the module board. This vertical separation in the third dimension enables compact module integration while effectively reducing electromagnetic coupling between sensitive reception components and filtering components, thus maintaining reception sensitivity in a small-sized 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 reduces electromagnetic coupling, thereby improving isolation between transmission and reception signals, enhancing reception sensitivity and heat dissipation while minimizing the module's size and layout area.
Implementation Method 1
the module board's electromagnetic-field shielding function to reduce coupling
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; an antenna connection terminal; a filter that is on the first principal surface and connected to the antenna connection terminal, wherein the filter includes one or more inductors and one or more capacitors, and is configured to allow a transmission signal and a reception signal to pass through; and a reception low noise amplifier on the second principal surface and configured to amplify the reception signal.