Passive-Element Antenna Array Layout for Lower PDoA Correlation
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Solution Overview
Problem
Existing antenna array structures face challenges in reducing azimuth-elevation correlation and mutual coupling, which affect the accuracy of phase-difference-of-arrival (PDoA) measurements and location determination in azimuth-elevation coordinate systems.
Innovation Solution
The antenna array structure incorporates multiple active antenna elements and a single passive antenna element, where the passive antenna element is isolated from all antenna ports, acting as a dummy element to absorb RF signals without feeding them to the ports, thereby reducing azimuth-elevation correlation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple active antenna elements are used for PDoA measurements, then location determination capability is improved, but azimuth-elevation correlation increases affecting measurement accuracy
Solution Approach 1:
A passive antenna element is introduced as an intermediary component between the active antenna elements. This passive element absorbs electromagnetic energy and reduces the correlation between azimuth and elevation measurements without requiring active signal processing or feedback mechanisms.
Solution Approach 2:
The harmful correlated signal component is extracted and redirected to the passive antenna element, which isolates it from the antenna ports. This separates the useful measurement signals from the harmful correlated interference.
2Area of stationary object
If antenna elements are closely spaced to reduce device size, then compactness is improved, but mutual coupling between elements increases
Solution Approach 1:
The passive antenna element serves as a mediator that absorbs mutually coupled electromagnetic energy between closely spaced active elements, preventing this energy from interfering with the measurement signals at the antenna ports.
Solution Approach 2:
The mutually coupled electromagnetic energy, which would normally be harmful interference, is converted into a beneficial effect by being absorbed by the passive antenna element, thereby reducing the harmful mutual coupling between active elements.
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 configuration improves the accuracy of PDoA measurements and location determination by reducing azimuth-elevation correlation and mutual coupling between active antenna elements, enhancing the overall performance of the antenna array.
Implementation Method 1
the passive antenna element acts as a dummy antenna element that can absorb electromagnetic energy of a radio frequency (RF) signal
Data Source
AI summary
Reducing azimuth-elevation correlation in an antenna array structure is provided. Herein, an antenna array structure is configured to include multiple active antenna elements and a single passive antenna element. In an embodiment, the active antenna elements are each coupled to a respective antenna port and the passive antenna element is isolated from all of the antenna ports. In other words, the passive antenna element acts as a dummy antenna element that can absorb electromagnetic energy of a radio frequency (RF) signal but does not provide the received RF signal to any of the antenna ports. The presence of the passive antenna element makes it possible to reduce an azimuth-elevation correlation between each orthogonal pair of active antenna elements in the antenna array structure to thereby improve accuracy of phase-difference-of-arrival (PDoA) measurements and location determination in an azimuth-elevation coordinate system.