Dipole Antenna Array Layout for Stable AoA Phase Centers
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Solution Overview
Problem
Conventional dipole antenna arrays face performance impairments due to ground plane and antenna-to-antenna reflections, which affect the stability of phase centers and accuracy in measuring the angle of arrival (AoA) of RF signals.
Innovation Solution
The implementation of a serrated edge on the ground plane and colinear or end-to-end arrangement of dipole antennas reduces reflections by creating a stable phase center, allowing for accurate AoA measurements by utilizing the phase differences between antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional dipole antenna array is used with a flat ground plane, then the structure is simple and easy to manufacture, but ground plane reflections cause phase center instability and reduce AoA measurement accuracy
Solution Approach 1:
The ground plane is segmented into multiple discrete ground elements spaced apart from each other, rather than using a continuous flat ground plane. This segmentation reduces the reflective surface area and breaks up reflection patterns, thereby reducing ground plane reflections and improving phase center stability for more accurate AoA measurements.
Solution Approach 2:
The ground plane structure is extended into the vertical dimension by positioning ground elements at different heights or depths relative to the antenna elements. This three-dimensional arrangement reduces the effectiveness of ground plane reflections compared to a conventional two-dimensional flat ground plane, while maintaining structural simplicity.
2Stability of the object's composition
If dipole antennas are arranged in a conventional configuration, then the array structure is simple, but antenna-to-antenna reflections occur and degrade phase center stability
Solution Approach 1:
The dipole antenna elements are arranged in an asymmetric configuration rather than a symmetric array, which disrupts the reflection paths between antennas. This asymmetric arrangement reduces antenna-to-antenna reflections and improves phase center stability without requiring complex additional components.
Solution Approach 2:
The antenna elements are pre-positioned at specific locations and orientations during design to minimize mutual reflections before signals are transmitted or received. This preliminary optimization of the geometric arrangement reduces phase center instability caused by antenna-to-antenna reflections.
Data Source
AI summary
Dipole antenna arrays are disclosed. An example dipole antenna array includes a ground plane having a first serrated edge, and a first dipole antenna, at least a portion of the first dipole antenna disposed parallel to the first serrated edge.