Multilayer Wiring Substrate Layout for Orthogonal Signal Isolation
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Solution Overview
Problem
Conventional multilayer patch antennas face challenges in improving isolation between high frequency signals in two orthogonal polarizations.
Innovation Solution
The multilayer substrate design includes a multilayer body with radiating conductor layers positioned to have different electromagnetic field vibration directions and utilizes connection conductors and signal paths to create phase differences, thereby enhancing isolation between high frequency signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional multilayer patch antenna structure is used, then the antenna can radiate high frequency signals in two orthogonal polarizations, but the isolation between the high frequency signals in two orthogonal polarizations is insufficient
Solution Approach 1:
A first connection conductor is introduced as an intermediary element positioned on the negative side of the Z-axis of the second radiating conductor layer. This connection conductor is connected to both the first signal path and the second signal path, acting as a mediator to create phase differences between the orthogonal polarization signals. The connection conductor enables the system to achieve better signal isolation by introducing a controlled interference path that cancels noise interference between the two polarization signals.
2Reliability
If the first connection conductor is positioned on the negative side of the Z-axis of the second radiating conductor layer, then noise interference is reduced through phase cancellation, but the structural complexity increases
Solution Approach 1:
The first connection conductor is merged with the existing multilayer substrate structure by positioning it on the negative side of the Z-axis of the second radiating conductor layer and integrating it into the lamination sequence. This merging approach allows the connection conductor to perform multiple functions: it serves as both a signal connection element and a phase control element, thereby reducing the need for additional separate components and minimizing structural complexity while achieving noise reduction through phase cancellation.
3Volume of moving object
If the second radiating conductor layer overlaps with the first radiating conductor layer when viewed in the negative direction of the Z-axis, then the antenna achieves compact design, but the electromagnetic field interference between layers increases
Solution Approach 1:
The patent employs asymmetric positioning of the first connection conductor on the negative side of the Z-axis of the second radiating conductor layer, rather than symmetric placement. This asymmetric configuration creates an unbalanced current distribution that generates a phase difference between the orthogonal polarization signals. The asymmetry principle allows the overlapping conductor layers to maintain compact volume while the phase difference mechanism cancels out electromagnetic field interference between the layers.
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
The design effectively reduces noise interference between high frequency signals by canceling out signal phases and trapping electromagnetic fields, improving signal isolation and reducing noise.
Implementation Method 1
The first connection conductor is provided in or on the multilayer body, connected to the first signal path and the second signal path, and positioned on the negative side of the Z-axis of the second radiating conductor layer
Implementation Method 2
A vibration direction of an electromagnetic field by the second high frequency signal propagating through air is different from a vibration direction of an electromagnetic field by the first high frequency signal propagating through the air
Implementation Method 3
The design effectively reduces noise interference between high frequency signals by canceling out signal phases and trapping electromagnetic fields, improving signal isolation and reducing noise
Data Source
AI summary
A multilayer substrate includes a multilayer body including insulator layers laminated along a Z-axis. A first radiating conductor layer receives or radiates first and second high frequency signals. Vibration directions of electromagnetic fields by the first and second high frequency signals propagating through air are different from each other. A second radiating conductor layer is positioned on a negative side of the Z-axis of the first radiating conductor layer, and overlaps with the first radiating conductor layer. First and second signal paths are connected to the first radiating conductor layer. The first and second high frequency signals are respectively transmitted through the first and second signal paths. A first connection conductor is connected to the first and second signal paths, and positioned on a negative side of the Z-axis of the second radiating conductor layer.