RF Module Surface Layout for Reception Harmonic Isolation
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Solution Overview
Problem
In small transceiver modules, the harmonic of digital control signals from the control circuit can flow into the reception path, deteriorating the reception sensitivity of circuit components connected to the reception path.
Innovation Solution
A radio frequency module configuration where the control circuit is disposed on one principal surface of the module board and the first circuit component connected to the reception path is disposed on the opposite surface, effectively suppressing electric field, magnetic field, or electromagnetic field coupling between the control circuit and the reception components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the control circuit and reception components are disposed on the same principal surface of the module board, then the device complexity is reduced, but the reception sensitivity deteriorates due to harmonic interference from digital control signals
Solution Approach 1:
The patent applies dimensional separation by disposing the control circuit on one principal surface of the module board and the reception components (first circuit component) on the opposite principal surface. This spatial separation in the third dimension (z-axis) effectively reduces electromagnetic coupling and harmonic interference while maintaining a compact overall device structure.
2Ease of operation
If the control circuit is placed close to the power amplifier for efficient control, then the ease of operation is improved, but harmful electromagnetic fields from the control circuit interfere with the reception path
Solution Approach 1:
The control circuit remains functionally connected to the power amplifier through controlled impedance traces on the same layer or adjacent layers, while the reception components are separated on the opposite principal surface. This maintains control efficiency while reducing harmful electromagnetic interference to the reception path.
Solution Approach 2:
The module board structure itself acts as an intermediary barrier between the control circuit and reception components. The board's dielectric properties and ground plane structures serve to shield and isolate the reception path from harmful electromagnetic fields generated by the control circuit.
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 prevents the harmonic of digital control signals from flowing into the reception paths, thereby maintaining or improving the reception sensitivity of the radio frequency module and communication device.
Implementation Method 1
the control circuit is disposed on one principal surface of the module board and the first circuit component connected to a reception path is disposed on the other surface, thereby suppressing electric field, magnetic field, or electromagnetic field coupling between the control circuit and the first circuit component
Implementation Method 2
the control circuit is disposed on one principal surface of the module board and the first circuit component connected to a reception path is disposed on the other surface, thereby suppressing electric field, magnetic field, or electromagnetic field coupling between the control circuit and the first circuit component
Implementation Method 3
the control circuit is disposed on one principal surface of the module board and the first circuit component connected to a reception path is disposed on the other surface, thereby suppressing electric field, magnetic field, or electromagnetic field coupling between the control circuit and the first circuit component
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 power amplifier connected to a transmission path, a first circuit component connected to a reception path, and a control circuit that controls the transmission power amplifier. The control circuit is disposed on the first principal surface, and the first circuit component is disposed on the second principal surface.