Loop Antenna Ground Gap for MIMO Isolation
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Solution Overview
Problem
In MIMO antenna systems for mobile terminals, the increasing miniaturization of devices poses a challenge in achieving high isolation between antenna units due to strong electromagnetic coupling, which affects radiation efficiency.
Innovation Solution
The implementation of a Loop structure antenna with a fixed-width gap between the antenna's ground loop and the PCB concentrates coupling current, reducing interference and improving isolation without compromising radiation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between two antenna units is reduced to achieve miniaturization, then the device size is reduced, but the electromagnetic coupling between antenna units increases and isolation decreases
Solution Approach 1:
A ground loop structure is introduced as an intermediary element between the antenna units. This ground loop acts as a mediator that redirects coupling currents away from the PCB and concentrates them within the ground loop structure, thereby reducing electromagnetic coupling between antenna units while allowing close spacing for miniaturization
Solution Approach 2:
The ground system is segmented into a dedicated ground loop structure separate from the PCB ground plane. By dividing the grounding path into a specific loop configuration, the patent creates controlled current pathways that prevent coupling currents from spreading across the PCB, thus reducing interference while maintaining compact dimensions
2Volume of moving object
If the distance between two antenna units is reduced to achieve miniaturization, then the device size is reduced, but isolation between antenna units decreases
Solution Approach 1:
The ground loop serves as an intermediary structure that improves isolation by providing a dedicated path for return currents. This mediator structure prevents coupling currents from affecting adjacent antenna units, thereby maintaining high isolation even when antenna units are closely spaced for miniaturization
Solution Approach 2:
The ground loop structure provides localized current containment around each antenna unit. By creating a specific regional boundary (the loop) that confines electromagnetic fields and currents to local areas, the patent prevents interference from spreading to neighboring antenna elements, thus maintaining isolation in compact configurations
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 design enhances isolation between MIMO antennas while maintaining radiation efficiency, making it suitable for various mobile terminal applications with a flexible and cost-effective structure.
Implementation Method 1
an electromagnetic coupling effect between two adjacent antenna units may distort current distribution on an antenna
Data Source
AI summary
A Multiple-Input Multiple-Output (MIMO) antenna is provided, which includes a Printed Circuit Board (PCB), an antenna connected with the PCB, a feed system, and a match circuit, wherein the antenna is connected with the feed system through the match circuit, the antenna connected with the PCB is the antenna having a Loop structure, and a gap having a fixed width is provided between a ground loop of the antenna connected with the PCB and the PCB. An MIMO antenna system and a mobile terminal are also provided. By adopting the MIMO antenna, system and mobile terminal, a coupling current between the MIMO antenna and the PCB can be relatively concentrated and current amplitude is small, thereby isolation between antennas is improved.