ECE Faculty Candidate Colloquium
Thursday ***Special Time and Location*** January 22 11:00 - 11:50 AM Kelley 1007 James Ginn Graduate Research Assistant CREOL, The College of Optics and Photonics University of Central Florida The Infrared Reflectarray The reflectarray antenna, in its most simple form, is a passive, planar microstrip antenna array designed for reflected beamforming. By spatially varying the reflected phase response of the antenna elements making up the array, reflectarrays allow a planar surface to impress a non-planar phasefront upon reflection. Initially proposed as a low-cost replacement for bulky parabolic reflectors, reflectarrays have been successfully developed and utilized at both RF and millimeter-wave frequencies. >From the standpoint of an optical systems designer, adapting low-frequency reflectarray technology for use in the infrared would provide a highly desirable alternative to similarly behaved polished or diffractive optical devices. Compared to traditional optics, reflectarrays can be cheaper to fabricate, have a smaller physical footprint, and allow for both utility stacking and direct integration of aberration correction. In this talk, I will discuss the development of the reflectarray in the long-wave infrared from element characterization to complete device. I will highlight the challenges inherent in the design of infrared antennas in the areas of modeling, materials, fabrication, and testing. In addition, I will discuss research efforts towards expanding the reflectarray into higher frequency bands and other related technologies including frequency selective surfaces and polarized emitters. Biography James is in the final year of his Ph.D. candidacy in Electrical Engineering at the University of Central Florida. As a member of the IR Systems Laboratory at CREOL, James has been involved in wide variety of inter-disciplinary fields such as antenna design, optics, material science, and nano-fabrication. He is an author or co-author of 11 journal publications, 11 conference proceedings, 1 industrial publication, and 1 patent in topics including infrared metamaterials, thin-film characterization, applied electromagnetics, and evolutionary optimization. In particular, his research in the area of infrared reflectarrays was noted in the recently published text Reflectarray Antennas as a technology "breakthrough" and currently holds the record for the highest frequency of reflectarray operation. James has also interned at Lockheed Martin Information Services and Ansoft Corporation.
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