Department of Electrical and Electronics Engineering
Recent Submissions

Spurious radiation from microstrip interconnects
(IEEE, 199305)The level of spurious radiation from microstrip interconnects, which are modeled here as either single or asymmetric parallel microstrip lines terminated by arbitrary complex load impedances, is investigated in this ... 
Nonseparable twodimensional fractional Fourier transform
(OSA Publishing, 19980810)Previous generalizations of the fractional Fourier transform to two dimensions assumed separable kernels. We present a nonseparable definition for the twodimensional fractional Fourier transform that includes the separable ... 
Timevariant linear pulse processing
(Elsevier, 19961015)Previously suggested systems for linear processing of temporal pulses are limited to timeinvariant (convolutiontype) operations. Although these are the most general operations possible with passive components, we show ... 
Experimental validation of strong directional selectivity in nonsymmetric metallic gratings with a subwavelength slit
(American Institute of Physics, 20110202)Strong directional selectivity is theoretically predicted and experimentally validated at the microwave frequencies in the beaming regime for a single subwavelength slit in nonsymmetric metallic gratings with doubleside ... 
Reducing Anchor Loss in Micromechanical Extensional Mode Resonators
(IEEE, 201002)In this work, we propose a novel method to increase the quality factor of extensional mode micromechanical resonators. The proposed resonator topology is suitable for integration in a siliconbased process to fabricate ... 
Neural network based target differentiation using sonar for robotics applications
(IEEE, 200008)This study investigates the processing of sonar signals using neural networks for robust differentiation of commonly encountered features in indoor robot environments. The neural network can differentiate more targets ... 
A numerically efficient technique for the analysis of slots in multilayer media
(IEEE, 199804)A numerically efficient technique for the analysis of slot geometries in multilayer media is presented using closedform Green's functions in spatial domain in conjunction with the method of moments (MoM). The slot is ... 
Comparison of fully threedimensional optical, normally conducting, and superconducting interconnections
(Optical Society of America, 19991210)Several approaches to threedimensional integration of conventional electronic circuits have been pursued recently. To determine whether the advantages of optical interconnections are negated by these advances, we compare ... 
The discrete fractional fourier transform
(IEEE, 200005)We propose and consolidate a definition of the discrete fractional Fourier transform that generalizes the discrete Fourier transform (DFT) in the same sense that the continuous fractional Fourier transform generalizes ... 
On the profile of frequency dependent dielectric properties of (Ni/Au)/GaN/Al0.3Ga0.7N heterostructures
(Elsevier, 201103)The voltage (V) and frequency (f) dependence of dielectric characteristics such as dielectric constant (epsilon'), dielectric loss (epsilon ''), dielectric loss tangent (tan (5) and real and imaginary part of electrical ... 
Double subband occupation of the twodimensional electron gas in InxAl1− xN/AlN/ GaN/AlN heterostructures with a low indium content (0.064≤x≤0.140) barrier
(Elsevier, 20100730)We present a carrier transport study on low indium content (0.064≤x≤0.140) InxAl1−xN/AlN/GaN/AlN heterostructures. Experimental Hall data were carried out as a function of temperature (33–300 K) and a magnetic field ... 
Highly directional enhanced radiation from sources embedded inside threedimensional photonic crystals
(Optical Society of America, 2005)We have experimentally studied emission of microwave radiation from a monopole source embedded in a threedimensional photonic crystal. We have demonstrated enhancement of microwave radiation at the band edge and cavity ... 
Growth of high crystalline quality semiinsulating GaN layers for high electron mobility transistor applications
(American Institute of Physics, 2006)Semiinsulating character ( sheet resistivity of 3.26 x 10(11) ohm/sq ) of thick GaN layers was developed for AlGaN/GaN high electron mobility transistor ( HEMT ) applications on an AlN buffer layer. Electrical and structural ... 
Spatial and spatialfrequency filtering using onedimensional gradedindex lattices with defects
(Elsevier, 20091201)The potential of onedimensional, periodic, gradedindex, isotropic dielectric lattices with defects in multiband spatial and spatialfrequency filtering is studied. It is shown that both narrow and widebandpass filters ... 
Transmission spectra and the effective parameters for planar metamaterials with omega shaped metallic inclusions
(Elsevier, 20100615)Planar metamaterials with omega shaped metallic inclusions were studied experimentally and theoretically. Our results show that when the incidence is perpendicular to the plane of the omega structure, the omega medium acts ... 
Observation of coupledcavity structures in metamaterials
(American Institute of Physics, 2008)In this letter, we investigated the transmission properties of metamaterial based coupledcavity structures. We first calculated the effective parameters of a splitring resonator (SRR) and composite metamaterial (CMM) ... 
Low dark current and high speed ZnO metal–semiconductor–metal photodetector on SiO2/Si substrate
(AIP Publishing, 2014)ZnO thin films are deposited by radiofrequency magnetron sputtering on thermally grown SiO2 on Si substrates. Pt/Au contacts are fabricated by standard photolithography and liftoff in order to form a metalsemiconductormetal ... 
ClosedForm Green's Function Representations in Cylindrically Stratified Media for Method of Moments Applications
(IEEE, 200904)Closedform Green's function (CFGF) representations for cylindrically stratified media, which can be used as the kernel of an electric field integral equation, are developed. The developed CFGF representations can safely ... 
Stepedgeinduced resistance anisotropy in quasifreestanding bilayer chemical vapor deposition graphene on SiC
(AIP Publishing, 2014)The transport properties of quasifreestanding (QFS) bilayer graphene on SiC depend on a range of scattering mechanisms. Most of them are isotropic in nature. However, the SiC substrate morphology marked by a distinctive ... 
Determining the effective constitutive parameters of finite periodic structures: photonic crystals and metamaterials
(IEEE, 200806)A novel approach to find the effective electric and A novel approach to find the effective electric and magnetic parameters of finite periodic structures is proposed. The method uses the reflection coefficients at the ...