Elias A. Alwan

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We proposed a novel reduced hardware receiver architecture with on-site coding. The proposed system offers a substantial reduction in the number of ADCs, and hence, fewer FPGA I/O pins. This results in a significant SWAP-C reduction, making digital beamforming with multiple concurrent beams more practical for large arrays. The proposed system was(More)
Recently, a novel class of on-site coding receivers was proposed. The architecture is suitable for digital beamforming in addition to offering multiple-input multiple-output capabilities. Essential to its realization is a code division multiplexing technique aggregating multiple signal paths at the analog front end into a single analog-to-digital converter.(More)
This paper presents a reconfigurable low profile ultra-wideband (UWB) phased array, having as much as 14.1:1 instantaneous bandwidth suitable for UHF to millimeter wave applications, with unprecedented integrated digital beam-forming capability across the entire bandwidth. To realize spectrum efficiency, aperture reconfiguration is also proposed. That is,(More)
Indium tin oxide (ITO) is one of the most commonly used optically transparent conductors in applications, such as electro-optic antennas, displays, and optical coatings. However, their RF frequencydependent electrical properties have not been reported in the literature. In this paper, we present measurements of the electrical properties (permittivity and(More)
We propose a new class of transceivers for secure communication and interference mitigation, operating over large bandwidths on the order of 10GHz. Specifically, a novel coding approach that combines frequency and code multiplexing is proposed. Equally important is power and hardware reduction by implementing a low power on-site coding with beamforming. The(More)
We present a novel ultra-wideband (UWB) dual-linear polarized phased array designed for simultaneous transmit and receive (STAR) monostatic antenna systems. The dual-linear polarized array employs a tightly coupled dipole topology that achieves an UWB operation from 2GHz to 18GHz, viz 9∶1 bandwidth. Also, its port to port isolation is at least 45dB(More)
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