Compact Radiating Arm Layout for MIMO Antenna Isolation
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Solution Overview
Problem
In MIMO antennas, the increased spacing between radiating elements leads to coupling interference and deteriorated isolation performance, affecting beam forming due to the compact design and reduced spacing between arrays.
Innovation Solution
The radiating element design incorporates a first and second electrically conductive arm segment, where the second segment extends radially from the first, reducing the horizontal extension dimension and increasing spacing between elements, thereby improving isolation by using a combination of PCB and metal segments connected through soldering or capacitive means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of radiating element arrays is increased for MIMO technology, then communication quality is improved, but the spacing between radiating elements is decreased, resulting in increased coupling interference and deteriorated isolation performance
Solution Approach 1:
The radiating arm is divided into two separate electrically conductive arm segments that are constructed separately and then electrically connected. This segmentation allows the radiating element to maintain its electrical length while reducing the horizontal extension dimension, thereby increasing spacing between adjacent radiating elements and reducing coupling interference in MIMO antenna arrays
Solution Approach 2:
The second arm segment extends in a different direction (non-horizontal) from the first arm segment, transitioning from a purely horizontal configuration to a three-dimensional structure. This dimensional change reduces the horizontal footprint of the radiating element while maintaining its radiating performance, enabling increased spacing between elements in the horizontal plane
2Object-affected harmful factors
If the spacing between radiating elements is increased to reduce coupling interference, then isolation performance is improved, but the antenna size increases
Solution Approach 1:
By extending the second arm segment in a non-horizontal direction (vertical or angled), the radiating element achieves its required electrical length in three-dimensional space rather than purely in the horizontal plane. This reduces the horizontal projection area of the radiating element, allowing increased spacing between elements without significantly increasing the overall antenna footprint
Solution Approach 2:
The segmented structure with two separately constructed arm segments allows flexible spatial arrangement where the second segment can extend in various directions. This enables optimization of both the horizontal spacing between elements and the overall antenna compactness by choosing appropriate extension directions and lengths
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 enhances space utilization, reduces coupling interference, and improves isolation performance, leading to better beam forming capabilities and reduced passive intermodulation in MIMO antennas.
Implementation Method 1
a first electrically conductive arm segment extending in a first direction and a second electrically conductive arm segment extending in a second direction from a radially outer end region of the first electrically conductive arm segment
Data Source
AI summary
A radiating element for an antenna comprises at least one radiating arm having a first electrically conductive arm segment extending in a first direction and a second electrically conductive arm segment extending in a second direction and electrically connected to the first arm segment.