RF Module Signal Power Terminal Isolation
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Solution Overview
Problem
In millimeter-wave systems, the coupling of radio frequency signals with power supply lines within the radio frequency module can lead to unnecessary oscillations, degrading signal quality due to the transmission of multiple signals through a single transmission line.
Innovation Solution
A radio frequency module design with a first substrate having separate signal and power supply terminals, where radio frequency electronic components are electrically connected to both, allowing for isolated transmission paths for radio frequency signals and power supply signals, eliminating the need for a bias-T circuit and reducing circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple signals (IF, Lo, control signals, and power supply signal) are transmitted through a single transmission line, then the circuit complexity is reduced and the mounting process is simplified, but the radio frequency signals may couple with the power supply line causing unnecessary oscillation and signal quality degradation
Solution Approach 1:
The patent applies segmentation by providing separate transmission lines for power supply signals and radio frequency signals within the radio frequency module. The power supply terminal and signal terminal are positioned at different locations on the substrate, and distinct conductive paths are established between these terminals and the radio frequency electronic component, thereby preventing signal coupling while maintaining a compact integrated structure.
2Reliability
If a bias-T circuit is added to isolate the power supply signal from radio frequency signals, then the signal quality is improved, but the device complexity and the number of components increase
Solution Approach 1:
The patent extracts the power supply signal transmission path from the combined signal transmission line used in conventional designs. By providing a dedicated power supply terminal and separate conductive path, the power supply signal is isolated from radio frequency signals without requiring additional isolation circuits such as bias-T circuits, thereby maintaining signal quality while reducing overall device complexity.
3Reliability
If separate transmission lines are provided for power supply and radio frequency signals, then unnecessary oscillation is suppressed and signal quality is improved, but the device complexity and mounting difficulty increase
Solution Approach 1:
The patent merges the separate power supply and signal transmission paths into a single integrated radio frequency module substrate. Both the power supply terminal and signal terminal are mounted on the same substrate with the radio frequency electronic component, and the conductive paths are formed as integrated traces on the substrate, thereby achieving signal isolation while maintaining ease of manufacture and assembly.
Data Source
AI summary
A radio frequency module includes a first substrate having a first principal surface and a second principal surface on the opposite side to the first principal surface; a signal terminal which is provided on the first principal surface and through which a signal is transmitted to and received from an external circuit; a power supply terminal that is provided on the second principal surface and is supplied with a power supply signal; an antenna; and a radio frequency electronic component that is electrically connected to the signal terminal, the power supply terminal and the antenna, and controls transmission and reception of the antenna based on the signal and the power supply signal.