Publications - Electrical & Computer Engineering
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Reconfigurable Dual Band Bidirectional ReflectionAmplifier with Applications in Van Atta Array
(IEEE, 2017-05-31)We designed a reconfigurable dual band reflection amplifier with operation frequency bands over 1.8 GHz and/or 2.4 GHz. This one-port amplifier boosts the reflected signal over either of these two ... -
A Full-duplex Bidirectional Amplifier with Low DCPower Consumption Using Tunnel Diodes
(IEEE, 2017-10-04)A low-power, switchless, full-duplex bidirectionalamplifier operating in the 915 MHz (ISM band) is proposed.It is composed of two identical reflection amplifiers and one90◦,−3dB Branch Line ... -
Reconfigurable Linear/Circular PolarizationRectangular Waveguide Filtenna
(IEEE, 2018-01)We introduce a new reconfigurable linear and cir-cular polarization antenna, based on a Rectangular Waveguide(RWG) and a novel reconfigurable polarizer. The polarizerconsists of two orthogonal ... -
Inherent Self-Interference Cancellation for In-Band Full-Duplex Single-Antenna Systems
(Institute of Electrical and Electronics Engineers (IEEE), 2018-04-11)We propose a new analog self-interference cancellation (SIC) technique for in-band full-duplex transmission (IBFD) in single-antenna systems. We use an RF circulator to separate transmitted (Tx) and received (Rx) signals. ... -
A Parallel Plate Ultra-Wideband Multibeam Microwave Lens Antenna
(Institute of Electrical and Electronics Engineers (IEEE), 2018-06-08)An ultra-wideband multibeam microwave lens antenna operating from 8 GHz to 18 GHz is proposed. The antenna consists of four excitation ports connected to a parallel plate waveguide filled with a cylindrical dielectric slab, ... -
Robust Self-Interference Cancellation for Microstrip Antennas by Means of Phase Reconfigurable Coupler
(Institute of Electrical and Electronics Engineers (IEEE), 2018-07-27)We propose a robust self-interference cancellation (SIC) technique for microstrip antennas. A microstrip antenna operates as a transmitter located between two identical receiver antennas having orthogonal polarization with ... -
UWB Double Ridge Waveguide Coupler with Low Loss
(Wiley, 2017-05-27)A new ultra-wide band coupler obtained with two crossed double-ridge waveguides coupled through one aperture is proposed. The main features of the coupler include: operating frequency from 6 GHz to 18 GHz; coupling coefficient ... -
A dual-polarized biconical antenna for direction finding applications from 2 -18 GHz
(Wiley, 2018-04-24)An ultra-wideband dual-polarized structure based on a biconical antenna for direction finding application from 2 GHz to 18 GHz is proposed. In addition to direction finding, the proposed structure may be used for broadband ... -
Dyadic contrast function for the forward model of diffraction tomography of thin cylindrical objects
(Institute of Electrical and Electronics Engineers (IEEE), 2016-10-07)A forward model for diffraction tomography is derived for the case of thin cylindrical objects by introducing a dyadic contrast function that takes into account depolarization phenomena, which were not previously addressed. ... -
Waveguide Dispersion Tailoring by using Embedded Impedance Surfaces
(American Physical Society, 2018-12)The capability to tailor the dispersion and the cutoff frequency of waveguides is of importance, as these essential parameters govern the operating frequency range and the waveguide dimension. Here, we propose the concept ... -
An Active 20-MHz to 2.5-GHz UWB Receiver Antenna System Using a TEM Horn
(Institute of Electrical and Electronics Engineers, 2017)An ultrawideband receiver antenna system is proposed. The radiating element is a transverse electromagnetic horn antenna, featuring a negative impedance converter at lower frequencies. The voltage standing-wave ratio (VSWR) ... -
Symmetry Properties of Spheroidal Functions With Respect to Their Parameter
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2017-09)Spheroidal wave functions depend on a parameter c. Their behavior with respect to changes of sign of c is investigated, and explicit formulas are provided. Sample applications of the resulting symmetry rules are provided ... -
Synthesis of High-Quality AgSbSe2 and AgBiSe2 Nanocrystals with Antimony and Bismuth Silylamide Reagents
(American Chemical Society, 2017-05-23)Silver dimetal chalcogenides (Ag-V-VI2) are ternary semiconductors that have potential alternative energy applications due to their optimal band gaps and large extinction coefficients. The synthesis of these materials is ... -
Pattern-Reconfigurable Printed Dipole Antenna Using Loaded Parasitic Elements
(Institute of Electrical and Electronics Engineers Inc., 2017)A printed dipole antenna is designed with two parasitic elements loaded by embedded resonators to provide reconfigurable patterns. The embedded resonators in the parasitic elements are loaded by varactor diodes, which ... -
Experimental percolation studies of random networks
(Elsevier B.V., 2017-06)This report establishes an experimental method of studying electrically percolating networks at a higher resolution than previously implemented. This method measures the current across a conductive sheet as a function of ... -
Effects of O2 plasma and UV-O3 assisted surface activation on high sensitivity metal oxide functionalized multiwalled carbon nanotube CH4 sensors
(AIP Publishing, 2017-11)The authors present a comparative analysis of ultraviolet-O3 (UVO) and O2 plasma-based surface activation processes of multiwalled carbon nanotubes (MWCNTs), enabling highly effective functionalization with metal oxide ... -
Defect induced structural inhomogeneity, ultraviolet light emission and near-band-edge photoluminescence broadening in degenerate In2O3 nanowires
(IOP Publishing, 2018-03-01)We demonstrate here defect induced changes on the morphology and surface properties of indium oxide (In2O3) nanowires and further study their effects on the near-band-edge (NBE) emission, thereby showing the significant ... -
Differential modulation for asynchronous two‐way relay systems over frequency‐selective fading channels
(Hindawi Publishing Corporation, 2016-07-28)We propose two schemes for asynchronous multi‐relay two‐way relay (MR‐TWR) systems in which neither the users nor the relays know the channel state information. In an MR‐TWR system, two users exchange their messages with ... -
Spin-dependent magneto-thermopower of narrow-gap lead chalcogenide quantum wells
(Nature Publishing Group, 2018-04-13)A semi-classical analysis of magneto-thermopower behaviour, namely, the \textit{Seebeck} and \textit{Nernst} effect (NE) in quantum wells of IV-VI lead salts with significant extrinsic Rashba spin-orbit coupling (RSOC) is ... -
Differential Modulation for Asynchronous Two-Way-Relay Systems over Frequency-Selective Fading Channels
(John Wiley and Sons Ltd, 2016-11-01)In this paper, we propose two schemes for asynchronous multi-relay two-way relay (MR-TWR) systems in which neither the users nor the relays know the channel state information (CSI). In an MR-TWR system, two users exchange ...