Phased Array Antenna Decoupling Units
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Solution Overview
Problem
In phased array base station antennas, close proximity of radiating elements leads to cross-coupling, distorting azimuth radiation patterns and reducing antenna performance due to increased cross-coupling, particularly at frequencies where coupling is strong.
Innovation Solution
The implementation of decoupling units with a conductive, U-shaped cross-section, mounted on a common ground plane, which induces surface currents to alter the electromagnetic field distribution and reduce near-field coupling between radiating elements of different arrays, thereby minimizing cross-coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If radiating elements are placed in close proximity to reduce antenna size, then the antenna occupies less space, but cross-coupling between elements increases causing distortion of radiation patterns
Solution Approach 1:
A decoupling structure is introduced as an intermediary element between adjacent radiating elements. This decoupling structure includes conductive elements that are electrically connected to a ground plane and positioned between the radiating elements to intercept and redirect electromagnetic fields, thereby reducing cross-coupling while allowing the elements to remain in close proximity for compact antenna design
Solution Approach 2:
The harmful electromagnetic coupling between radiating elements is extracted and redirected through the decoupling structure. The decoupling elements are designed to capture the coupled energy and guide it to the ground plane, effectively removing the harmful cross-coupling effect from the radiation pattern while maintaining element proximity
2Adaptability or versatility
If multiple arrays operate in the same frequency range, then the antenna provides comprehensive coverage, but mutual interference between arrays increases
Solution Approach 1:
Decoupling structures are positioned between radiating elements of different arrays that operate in the same frequency range. These structures serve as mediators that prevent direct electromagnetic interference between the arrays while allowing both arrays to maintain their operational frequencies for comprehensive coverage
Solution Approach 2:
The antenna system is segmented into multiple arrays with decoupling structures placed between them. This segmentation allows each array to operate independently in the same frequency range while the decoupling structures prevent mutual interference, enabling comprehensive frequency coverage without interference
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 decoupling units effectively improve the radiation pattern performance by reducing cross-coupling, maintaining desired beam characteristics and enhancing the antenna's symmetry and half-power beam width.
Implementation Method 1
which induces surface currents to alter the electromagnetic field distribution and reduce near-field coupling between radiating elements
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A base station antenna includes a panel that has a ground plane, first and second arrays that have respective first and second sets of linearly arranged radiating elements mounted on the panel, and a decoupling unit positioned between a first radiating element of the first array and a first radiating element of the second array. The decoupling unit includes at least a first sidewall that faces the first radiating element of the first array, a second sidewall that faces the first radiating element of the second array and an internal cavity that is defined in the region between the sidewalls. The first and second sidewalls are electrically conductive and electrically connected to the ground plane.