1D, 2D, and 3D Periodic Structures: Electromagnetic Characterization, Design, and Measurement
Aug 21, 2013
from 02:00 PM to 04:00 PM
|Where||Engr. IV Bldg., Faraday Room 67-124|
|Contact Name||Tim Brockett|
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Advisor: Yahya Rahmat-Samii
Periodic structures have many useful applications in electromagnetics including phased arrays, frequency selective surfaces, and absorbing interfaces. Unique properties due to the periodic nature of their elements can be used to provide increased performance in antenna gain, electromagnetic propagation, and electromagnetic absorption. In antenna arrays, repeating elements create a larger effective aperture, increasing the gain of the antenna and the ability to scan the direction of the main beam. Three-dimensional periodic structures, such as an array of shaped pillars in cones or prisms formations have the potential of improving electromagnetic absorption. This feature can improve performance in applications such as solar cell efficiency and absorbing interfaces. Furthermore, research into periodic structures is a continuing process where novel approaches and analysis in appropriate applications can be sought.
This presentation will address the analysis, diagnostics, and enhancement of 1D, 2D and 3D periodic structures for antenna array applications and solar cell technology. In particular, a unique approach to array design will be introduced to prevent the appearance of undesirable grating lobes in large antenna arrays that use subarrays. This approach, referred to as the distortion diagnostic procedure, can apply directly to 1D and 2D periodic structures in the form of planar antenna arrays. Also included here are developments in millimeter-wave antenna array measurements including spiral planar scanning, phaseless measurements, and addressing antennas that feature an internal source. Finally, analysis, optimization and design of 3D periodic nanostructure photovoltaic arrays will be presented for their behavior and basic operation in regards to improved absorption of electromagnetic waves.
Timothy Brockett is pursuing a Ph.D. under the supervision of Prof. Yahya Rahmat-Samii in the Antenna Research, Analysis, and Measurements (ARAM) laboratory. He earned a BS and MS in Electrical Engineering from UCLA in 2004 and 2008, respectively. From 2004 to 2007 he was the manager of the Center for High Frequency of Electronics (CHFE) at UCLA. In addition, he is the supervisor of UCLA's antenna ranges including the spherical and bipolar planar near-field ranges. His research interests include antenna measurement, antenna arrays, periodic structures, and the emerging fields of nanostructures.