MIMO Antenna Array With Coupled Bars For Fading Environments
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Solution Overview
Problem
Existing MIMO antenna designs for mobile devices in the ISM 900 MHz band fail to provide sufficient diversity gain and low envelope correlation in fading environments, especially when used in time division duplex schemes, necessitating a new design that can maintain uninterrupted data transmission and reception.
Innovation Solution
A 4-by-4 MIMO antenna array is designed using an etching process on Taconic Cer-10, featuring a ring structure with coupled bars and a disc to generate orthogonal currents, allowing operation as an n-by-n transceiver architecture, with improved isolation and effective area, suitable for both transmit and receive operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple antenna arrangement is used, then the device complexity is reduced, but the diversity gain and envelope correlation performance deteriorate in fading environments
Solution Approach 1:
The antenna system is segmented into four distinct antenna elements arranged in a specific geometric configuration. Each element is designed with unique dimensions and orientations to create spatial diversity, allowing the system to achieve 13-15 dB diversity gain while maintaining manageable complexity through modular design
Solution Approach 2:
The patent transitions from simple planar antenna arrangements to a three-dimensional configuration with elements positioned at different heights and orientations. This dimensional expansion creates uncorrelated fading paths between elements, achieving low envelope correlation coefficients while maintaining a compact form factor suitable for mobile devices
2Reliability
If MIMO transceiver with combining methods is used, then the Signal to Noise Ratio is improved, but the antenna array complexity increases
Solution Approach 1:
The patent combines multiple antenna elements into a unified array structure with shared feeding networks and ground planes. This merging approach enables Maximum Ratio Combining at the receiver while reducing overall system complexity through common structural elements and simplified interconnections
Solution Approach 2:
The antenna array is designed to serve multiple functions simultaneously: it provides both transmit and receive capabilities, supports multiple frequency bands, and enables both diversity and MIMO operations. This multi-functionality reduces the need for separate antenna systems, thereby managing complexity while achieving high SINR through combining methods
3Adaptability or versatility
If multiband antenna is used, then the frequency coverage is expanded, but the antenna performance at specific frequencies deteriorates
Solution Approach 1:
Different antenna elements within the array are designed with locally optimized dimensions and geometries tailored to specific frequency bands. This allows each element to maintain high performance at its designated frequency while the overall array provides broad multiband coverage, achieving both versatility and tuning precision
Data Source
AI summary
A MIMO antenna used in both transmit and receive operations, with the ability to serve an n-by-n MIMO transceiver architecture (where n can take integer values between 0 to 4). The structure is designed to increase the effective area of the array by coupling the bars of the antenna to the disc and results in good isolation and low envelope correlation.