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HomeResearch → Phased Array/MIMO Antenna Subsystem

The group's research on phased array and MIMO antennas is to take advantage of the spatial redundancy and dynamic coupling among multiple antenna elements for system benefits.

The achievements in this field include works simplifying the conventional phased arrays with low cost, low complexity array architectures, single wafer integration of the array elements with the feeding and power distribution network, development of MIMO antennas and beamforming array with small form factors yet robust performance.

Arrays with Spatial Multiplexing of Local Elements (SMILE)

SMILE technique is to provide a low cost solution in developing phased arrays by simplifying the multiple, parallel power distribution network feeding to each antenna element to a series feeding network with a parallel to series multiplexer. The speed of multiplexing is beyond the Nyquist rate of the signal bandwidth so the information of the array reception is retained in the multiplexing process.

 

S. Kim and Y. E. Wang,  "A Uni-Planar 2-D Array for Digital Beamforming (DBF) and Directional of Arrival (DOA) Estimation" IEEE Transactions on Vehicular Technology, Vol. 58, No.7, pp.3137 - 3144,  Sept. 2009

Wafer Based Millimeterwave Phased Array

Wafer based phased array provides a low cost solution for the developments of phased arrays in milimeter wave frequencies, when the required array element spacing is becoming tight. The effort of wafer based array is carried out jointly with Quinstar Corp. and GCS. A W-band phased array with more than 400 elements were developed on a single GaAs wafer and the array was able to perform electronic scanning in both vertical and horizontal directions.

 

J.W. Kuo and Y. E. Wang., "Low cost wafer based W-band phased array", 2010 IEEE Antennas and Propagation Society International Symposium (APSURSI).

Mode-based MIMO and Beamforming Array

The purpose of model-based feeding or beamforming is to overcome the mutual coupling issue in arrays with closely spaced antenna elements. Under such techniques, the coupling among the antenna elements, instead of being detrimental, can increase the antenna gain and result an interesting “supergain” antenna. In 2008, the group presented both theoretical basis and experimental validation of this concept for the first time on a 2-element array. In 2009, the similar concept was extended to a 4-element circular array with a foot print of 0.1 lamda by 0.1 lamda yet being able to perform electronic scanning over 360 degrees with a “supergain” beam.

L. Yeung and Y. E. Wang, "Mode-Based Beamforming Arrays for Miniaturized Platforms" IEEE Transactions on Microwave Theory and Techniques, pp.45 – 52, Jan., 2009.

T-I. Lee and Y. E. Wang,  "Mode-Based Information Channels in Closely Coupled Dipole Pairs" IEEE Transactions on Antenna and Propagations,  pp.3804 – 3811, Vol.56, No.12, Dec. 2008.