Multilayer Antenna Board Layout for Stable Radiation Patterns
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Solution Overview
Problem
Existing antenna modules face challenges in reducing the difference between the radiation patterns of multiple high-frequency signals and preventing the tilt of radiation directions with respect to the normal direction of the radiation conductor layer.
Innovation Solution
A multilayer board structure is designed with specific configurations of radiation conductor layers, wiring layers, and ground conductor layers, where the wiring layers intersect but are not orthogonal to the radiation conductor layers' edges, and the substrates are positioned to minimize overlapping and maintain equal capacitance distances, thereby controlling the radiation patterns and directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional wiring layers are positioned orthogonally to radiation conductor edges, then wiring layout is simplified, but radiation pattern difference and direction tilting increase
Solution Approach 1:
The wiring layers are deliberately positioned at non-orthogonal angles relative to the radiation conductor edges. This asymmetric arrangement prevents the wiring from acting as parasitic radiators that would create unwanted radiation patterns, thereby reducing the difference between intended and actual radiation patterns while maintaining proper signal transmission.
Solution Approach 2:
The patent applies different angular relationships between wiring layers and radiation conductor edges at different locations. By optimizing the local angular relationship at each wiring-radiator interface, the design minimizes interference effects locally, which collectively improves the overall radiation pattern consistency and reduces direction tilting.
2Area of stationary object
If wiring layers are positioned closer to radiation conductor edges, then space utilization improves, but interference and radiation pattern distortion increase
Solution Approach 1:
The non-orthogonal positioning creates an asymmetric geometric relationship between the wiring layers and radiation conductor edges. This asymmetric configuration reduces the coupling between the wiring (which may carry differential signals) and the radiation conductors, thereby minimizing interference while still allowing compact spatial arrangement.
Solution Approach 2:
The insulator layer serves as an intermediary between the wiring layers and radiation conductor edges. By positioning the wiring layers on one side of the insulator while the radiation conductors are on the other side, the insulator provides electrical isolation and reduces direct coupling, thereby minimizing interference effects.
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 proposed structure effectively reduces the difference between radiation patterns and prevents tilt of radiation directions, enhancing the alignment and consistency of high-frequency signal radiation and reception.
Implementation Method 1
The first radiation conductor layer radiates the first high-frequency signal. A second high-frequency signal is input to the radiation conductor layer through the second power supply point. The radiation conductor layer radiates the second high-frequency signal.
Data Source
AI summary
A multilayer board includes a multilayer body including a first radiation conductor layer, a ground conductor layer, a first wiring layer, and a second wiring layer. The first wiring layer is electrically connected to a first radiation conductor layer at a first power supply point positioned closest to a first straight line in a first outer edge and intersects but is not orthogonal to the first straight line in a view along a Z-axis direction. The second wiring layer is electrically connected to the first radiation conductor layer at a second power supply point positioned closest to a second straight line in the first outer edge and intersects but is not orthogonal to the second straight line in a view along the Z-axis direction.