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Low-Observable Reflectors Using Perfect Pulses

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Low-Observable Reflectors Using Perfect Pulses
Mohammad Alhassoun, Michael A. Varner, Gregory D. Durgin
2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting
Year: 2018, Page s: 915 – 916

This paper presents a new technique for suppressing specular reflection using binary reflective surfaces (such as those easily fabricated on a printed circuit board)that maximally suppress mean currents on the reflector using the theory of perfect pulses. We simulate multiple versions (or orders)of these structures to characterize the nulling depth and manufacturing tolerance of the designs. In addition, we run another set of simulations to characterize the specular reflection as a function of the direction of incidence. The simulation reveals that the specular reflection from the proposed structures is at least 9.3 dB less than that from a flat metal plate of the same dimensions.

Scattering and Computer Graphics

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In this set of notes, an electromagnetic model of rough surface scattering is presented, with analogies drawn to rendering and shading models in computer graphics.  Although this originates in an RF-centric modeling class, the analogy to optics is helpful for understanding this phenomenon.   The end contains an interesting biographical paragraph on the inventor of the Phong shading model as well as some illustrative renderings of spheres.

Notes on Phong Shading

Congratulations Tianchong Jiang!

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Congratulations to Tianchong (Michael) Jiang for completing his MS thesis entitled, “Tri-band Object-Resistant Antenna Design.”  Tianchong performed an outstanding original design, build, and test for a triple-band ISM antenna.  Not only did the antenna function well at the target bands, but incorporated object resistance techniques developed at the GTPG.  The methodology will be valuable for designing future antennas in commercial wireless devices.