Vertical Conductor Loop Substrates for RF Coupling Noise Isolation
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Solution Overview
Problem
In antenna modules, the close proximity of RF transmission lines can lead to coupling noise due to electromagnetic waves, which conventional ground planes may not effectively isolate, especially when reduced spacing is required for smaller module sizes.
Innovation Solution
The implementation of vertical conductor loops in adjacent metallization layers to the RF transmission lines, which induce a magnetic field in the opposite direction, reducing or canceling the magnetic flux and thus minimizing coupling noise without the need for lateral ground plane connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RF transmission lines are routed close together for efficient signal routing, then routing efficiency is improved, but coupling noise between adjacent transmission lines increases
Solution Approach 1:
The patent introduces vertical conductor loops in adjacent metallization layers to provide noise isolation. Instead of using lateral ground plane connections in the same metallization layer, the solution moves to the vertical dimension by forming conductor loops that extend through multiple metallization layers, creating a three-dimensional isolation structure that effectively blocks coupling noise while maintaining close horizontal spacing between transmission lines
Solution Approach 2:
The vertical conductor loops act as intermediary structures between adjacent RF transmission lines. These loops serve as a mediating element that provides magnetic flux cancellation and noise isolation without requiring direct lateral connection between the transmission lines or traditional ground plane structures, enabling efficient routing while preventing coupling noise
2Object-affected harmful factors
If lateral ground plane connections are used to isolate RF transmission lines, then coupling noise is reduced, but the spacing between transmission lines must be increased
Solution Approach 1:
The patent eliminates the need for lateral ground plane connections by transitioning to vertical conductor loops that extend through multiple metallization layers. This dimensional change allows noise isolation to be achieved in the vertical dimension rather than requiring increased horizontal spacing, enabling transmission lines to be routed closer together while maintaining effective coupling noise reduction
Solution Approach 2:
Instead of using traditional lateral ground plane connections that extend horizontally between transmission lines, the patent inverts the approach by using vertical conductor loops that extend vertically through metallization layers. This inverted structure provides the same noise isolation function without requiring lateral spacing, allowing transmission lines to be positioned closer together
3Volume of moving object
If module size is reduced for compact device integration, then device compactness is improved, but spacing between RF transmission lines must be decreased
Solution Approach 1:
The patent enables compact module design by introducing vertical conductor loops that provide noise isolation in the vertical dimension. This allows transmission lines to be routed very close together in the horizontal plane without requiring traditional lateral ground plane spacing, significantly reducing the overall module size while maintaining effective noise isolation and signal integrity
Solution Approach 2:
The vertical conductor loops are formed within the existing multi-layer metallization structure of the substrate, nesting the noise isolation function within the same physical envelope as the signal routing layers. This nested arrangement provides coupling noise reduction without adding lateral space, enabling compact module integration
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 approach allows for reduced spacing between RF transmission lines while effectively isolating them from coupling noise, maintaining signal integrity and enabling smaller antenna module designs.
Implementation Method 1
vertical conductor loops in adjacent metallization layers to the RF transmission lines, which induce a magnetic field in the opposite direction, reducing or canceling the magnetic flux and thus minimizing coupling noise
Implementation Method 2
The magnetic flux loop, generated by the RF transmission lines as a result of carrying RF signals, penetrates through the opening of the adjacent vertical loop structures, thereby inducing a magnetic field in the vertical conductor loops in the opposite direction of the magnetic field. The induced magnetic field in the vertical conductor loops induces eddy currents in the vertical conductor loops, which in turn interferes with the magnetic field, thus causing a magnetic damping force in the magnetic field.
Data Source
AI summary
Antenna module substrate employing vertical conductor loops for coupling noise reduction in radio-frequency (RF) transmission lines, and related antenna modules and fabrication methods. To provide effective electrical isolation between closely routed RF transmission lines in a metallization layer of the substrate, vertical conductor loops are formed in a metallization layer(s) adjacent to the RF transmission lines. The magnetic flux loop generated by the RF transmission lines as a result of carrying RF signals penetrates through the opening of the adjacent vertical loop structures, thereby inducing a magnetic field in the vertical conductor loops in the opposite direction of the magnetic flux. The induced magnetic field in the vertical conductor loops induces eddy currents in the vertical conductor loops, which in turn interferes with the magnetic flux thus causing a magnetic damping force in the magnetic flux, thus reducing or cancelling RF transmission line coupling noise.