Low-Profile Antenna Decoupling Structure for Array Isolation
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Solution Overview
Problem
Conventional array antenna decoupling structures increase the size and weight of antennas due to their high profile height, leading to reduced performance and spectrum utilization in 5G MM systems.
Innovation Solution
A dual-polarization antenna design incorporating low-height metal structures, such as conductive patches, is used as a parasitic decoupling structure, introducing additional coupling paths to offset original coupling energy without significantly increasing the antenna's size or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional ADS decoupling structure is used, then antenna decoupling is achieved, but the profile height increases leading to larger size and weight
Solution Approach 1:
The patent changes the key parameter of the decoupling structure from height to lateral positioning. By placing metal structures at specific horizontal distances (0.05-0.15 wavelength) from the antenna element, the patent achieves decoupling through lateral spacing rather than vertical height, thereby reducing profile height and antenna weight while maintaining decoupling effectiveness.
2Reliability
If a conventional ADS decoupling structure is used, then antenna decoupling is achieved, but the profile height increases leading to larger size
Solution Approach 1:
The patent transitions the decoupling mechanism from the vertical dimension to the horizontal dimension. Instead of using vertical spacing between decoupling layers, the patent employs horizontal spacing between antenna elements and metal structures, achieving decoupling through lateral positioning rather than vertical height.
3Area of stationary object
If antenna elements are placed closer to reduce installation space, then space utilization improves, but mutual coupling between adjacent elements increases
Solution Approach 1:
The patent introduces metal structures as intermediary elements between antenna elements. These metal structures act as parasitic elements that interact with the electromagnetic fields of adjacent antenna elements, providing an additional coupling path that offsets the original coupling energy and reduces mutual coupling effects.
Solution Approach 2:
The patent converts the harmful mutual coupling effect into a beneficial decoupling mechanism by introducing metal structures that create additional coupling paths. The coupling energy that would normally be harmful is redirected through these intermediate structures, transforming the harmful interaction into a useful decoupling effect.
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 design effectively decouples adjacent antenna elements, improving isolation, matching characteristics, and beam width while maintaining a compact form factor, thus enhancing antenna performance without additional costs.
Implementation Method 1
Based on an electromagnetic wave diffraction effect and coupling effect, the first metal structure and the second metal structure are loaded above the antenna element as a parasitic decoupling structure
Implementation Method 2
Based on an electromagnetic wave diffraction effect and coupling effect, the first metal structure and the second metal structure are loaded above the antenna element as a parasitic decoupling structure
Data Source
AI summary
An example antenna includes a ground plate, a conductor sheet, a first metal structure, and a second metal structure. In a vertical direction of the antenna, the first metal structure and the second metal structure are located above the conductor sheet, the conductor sheet is located above the ground plate, a distance between the first metal structure and the ground plate ranges from 0.01 to 0.2 times a wavelength of the antenna, and a distance between the second metal structure and the ground plate is less than or equal to the distance between the first metal structure and the ground plate. In a horizontal direction of the antenna, the first metal structure and the second metal structure are perpendicular to each other. The first metal structure and the second metal structure with low heights are loaded above an antenna element as a parasitic decoupling structure.