Signal Line Ground Layout for RF Noise and Radiation Suppression
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Solution Overview
Problem
Parasitic capacitance across the gap between system and earth ground planes in RF transmission leads to noise, radiation, and antenna effects, degrading the sensitivity of electrical systems.
Innovation Solution
A signal line structure with earth and system ground planes separated by gaps, connected via vias, and optionally featuring a shielding plane between the gaps to suppress radiation and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the ground plane is divided into system ground and earth ground separated by a gap, then noise influence from the ground plane on the electrical system is mitigated, but parasitic capacitance is formed across the gap causing radiation and antenna effects
Solution Approach 1:
The ground plane is segmented into system ground and earth ground regions separated by a gap, which mitigates noise influence while controlling parasitic effects through strategic placement of reference grounds near discontinuities
Solution Approach 2:
Reference ground planes are introduced as intermediary elements positioned near signal line discontinuities to provide local return paths and reduce the impact of parasitic capacitance across the main ground gap
2Object-affected harmful factors
If the ground plane is separated into discontinuous system ground and earth ground, then noise shielding is improved, but current passes through the discontinuous ground plane causing radiation and antenna effects
Solution Approach 1:
The ground plane structure employs different configurations in different locations: a continuous ground for general noise shielding and discontinuous ground with gaps strategically placed near signal line discontinuities to control current paths and reduce radiation
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
Effectively suppresses constructive enhancement of radiations and noise, enhancing the sensitivity and performance of RF transmission systems.
Implementation Method 1
separated by a gap filled with a dielectric material or left air-filled to mitigate the influence of noise from the ground plane on the electrical system
Implementation Method 2
parasitic capacitance may be formed across the gap
Data Source
Figure 1A
Figure 1B~1C
Figure 2~3
AI summary
A signal line structure (1) is provided. The signal line structure (1) includes a first earth ground plane, formed on a first layer; a first system ground plane, formed on the first layer (10), wherein the first earth ground plane and the first system ground plane (102) are separated by a first gap (GAP1); a signal line (103), formed on the first layer (10), wherein the first earth ground plane is formed around an input side of the signal line (103) and the first system ground plane (102) is formed around an output side of the signal line (103); a second earth ground plane (201), formed on a second layer (20); a second system ground plane (202), formed on the second layer (20), wherein the second earth ground plane (201) and the second system ground plane (202) are separated by a second gap (GAP2).