MIMO Antenna Array Isolation via Parasitic Element
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Solution Overview
Problem
MIMO antenna systems with inherent 15 dB isolation fail to achieve effective beam steering and adaptive steering, especially when elements have the same directional pattern, limiting their ability to eliminate interference and enhance signals.
Innovation Solution
Incorporating a resonant isolation antenna element on a ground plane between multiple antenna transmitting/receiving elements, arranged to achieve substantially greater than 15 dB isolation, such as 30 dB, by controlling phase or amplitude of RF energy and optimizing the placement of these elements to enhance isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna transmitting/receiving elements are arranged in a MIMO array with inherent 15 dB isolation, then the system can perform basic transmitting and receiving operations, but the isolation between elements is insufficient to achieve effective beam steering and adaptive steering
Solution Approach 1:
A parasitic isolation antenna element is introduced as an intermediary component between the transmitting/receiving antenna elements. This isolation element, when excited by adjacent elements, creates canceling electromagnetic fields that reduce mutual coupling and improve isolation between antenna elements from the inherent 15 dB to greater than 30 dB
Solution Approach 2:
The isolation antenna element's electrical characteristics are optimized by adjusting its length, width, and position relative to the transmitting/receiving elements. By tuning these parameters, the isolation element resonates at the operating frequency and achieves maximum isolation effect, transforming the isolation performance from 15 dB to greater than 30 dB
2Device complexity
If antenna elements with the same individual directional pattern are used in a MIMO array, then the system structure is simplified, but the ability to eliminate interference and enhance signals through beam steering is limited
Solution Approach 1:
The parasitic isolation antenna element acts as a mediator that enables different effective directional patterns from identical physical antenna elements. By selectively exciting and controlling the isolation elements associated with each antenna element, the system can create different beam patterns and nulls to eliminate interference while maintaining structural simplicity
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 solution achieves significantly improved isolation between antenna elements, enabling more effective beam forming and adaptive steering, particularly useful for WIFI applications, with enhanced signal quality and reduced interference.
Implementation Method 1
each of the antenna transmitting/receiving elements is resonant at a frequency f... The isolation antenna element is also resonant at the same frequency f
Implementation Method 2
The plurality of antenna transmitting/receiving elements and the resonant isolation antenna element are arranged on the ground plane so as to achieve substantially greater than 15 dB isolation of the antenna transmitting/receiving elements
Data Source
AI summary
A high-isolation multiple in, multiple out (MIMO) antenna array includes, in one configuration, a ground plane, and a plurality of antenna transmitting/receiving elements arranged near the periphery of the ground plane, wherein each of the antenna transmitting/receiving elements is resonant at a frequency f. Also, the array includes an isolation antenna element located on the ground plane, between the plurality of antenna transmitting/receiving elements. The isolation antenna element is also resonant at the same frequency f. The plurality of antenna transmitting/receiving elements and the resonant isolation antenna element are arranged on the ground plane arranged so as to achieve substantially greater than 15 dB isolation of the antenna transmitting/receiving elements. In some configurations, at least about 30 dB of isolation of the antenna transmitting/receiving elements can be achieved.