Works (35)

Updated: July 5th, 2023 16:01

2012 journal article

Flexible Liquid Metal Alloy (EGaIn) Microstrip Patch Antenna

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 60(5), 2151–2156.

By: G. Hayes n, J. So n, A. Qusba n, M. Dickey n & G. Lazzi*

author keywords: EGaIn antenna; flexible microstrip patch antenna; liquid metal antenna; multi-layer; polydimethylsiloxane (PDMS)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID
Added: August 6, 2018

2011 journal article

A frequency shifting liquid metal antenna with pressure responsiveness

APPLIED PHYSICS LETTERS, 99(1).

By: M. Khan n, G. Hayes n, J. So n, G. Lazzi* & M. Dickey n

UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID
Added: August 6, 2018

2010 journal article

Computation of Induced Current Densities in the Human Body at Low Frequencies Due to Contact Electrodes Using the ADI-FDTD Method

IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY, 52(3), 537–544.

By: V. Singh n, A. Ajeet n, N. Kwatra n, C. Cela, J. Ziriax*, J. D'Andrea*, G. Lazzi n

author keywords: D-H ADI-FDTD; HEMI devices; impedance method; low frequency computational bioelectromagnetics; neuron recruitment volume
TL;DR: It is shown that, when used with quasi-static assumptions, Fourier series decomposition, and expanding grid, the D-H ADI-FDTD can be an effective computational bioelectromagnetics tool. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2010 journal article

Noise Correlation in Compact Diversity Receivers

IEEE TRANSACTIONS ON COMMUNICATIONS, 58(5), 1426–1436.

By: C. Domizioli n, B. Hughes n, K. Gard n & G. Lazzi n

author keywords: Antenna arrays; mutual coupling; noise; receivers; diversity methods
TL;DR: This model shows that noise in a compact diversity receiver may be spatially correlated, and expresses relating noise correlation to properties of the antennas and amplifiers are derived and its impact on the outage probability of an optimal diversity combiner is studied. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2009 conference paper

Computational and experimental bioelectromagnetics for a retinal prosthesis

ICEAA: 2009 International Conference on Electromagnetics in Advanced Applications, vols 1 and 2, 978–980.

By: G. Lazzi

Source: NC State University Libraries
Added: August 6, 2018

2009 journal article

Reversibly Deformable and Mechanically Tunable Fluidic Antennas

ADVANCED FUNCTIONAL MATERIALS, 19(22), 3632–3637.

By: J. So n, J. Thelen n, A. Qusba n, G. Hayes n, G. Lazzi n & M. Dickey n

Sources: Web Of Science, ORCID
Added: August 6, 2018

2009 journal article

Specific Absorption Rate and Current Densities in the Human Eye and Head Induced by the Telemetry Link of an Epiretinal Prosthesis

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 57(10), 3110–3118.

By: V. Singh n, A. Qusba n, A. Roy*, R. Castro*, K. McClure*, R. Dai*, R. Greenberg*, J. Weiland*, M. Humayun*, G. Lazzi n

author keywords: Bioelectromagnetics; finite-difference time-domain (FDTD); specific absorption rate (SAR)
TL;DR: Simulations between 2 and 20 MHz indicated that the induced electric field values scale well with frequency, thus providing guidelines for the determination of the final frequency and input power requirements of operation for the telemetry system to meet safety standards. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2008 journal article

A comparison of two and three dimensional dipole antennas for an implantable retinal prosthesis

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 56(3), 622–629.

By: S. Soora*, K. Gosalia*, M. Humayun* & G. Lazzi n

author keywords: current vector alignment; implantable antenna; meander line antenna; miniature antenna; retinal prosthesis; three dimensional (3D) antenna
TL;DR: Three dimensional folded dipole antennas are investigated as a data-telemetry implantable receiving antenna in a dual-unit retinal prosthesis to restore partial vision to the blind, showing that three-dimensional antennas can provide larger bandwidth while being physically smaller than the correspondent two-dimensional ones. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2008 conference paper

Finite difference formulation to calculate the induced current density profile inside the retina by a microcoil array

2008 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, 3074–3077. [Piscataway, NJ]: IEEE.

By: S. Srinivas, J. George & G. Lazzi

Source: NC State University Libraries
Added: August 6, 2018

2008 article

Mutual Coupling Effects in MIMO MRC Systems with Limited Feedback

GLOBECOM 2008 - 2008 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE.

By: Y. Dong n, B. Hughes n & G. Lazzi n

TL;DR: Numerical results suggest that, regardless of the power measure and matching networks, the benefits of MIMO MRC with limited feedback can be achieved with antennas spaced as close as 0.2 - 0.3 wavelengths apart. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2008 journal article

On the degrees of freedom in linear array systems with tri-polarized antennas

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 7(7), 2458–2462.

By: G. Gupta n, B. Hughes n & G. Lazzi n

author keywords: MIMO; polarized antenna; degrees of freedom
TL;DR: It is concluded that linear arrays of tri-polarized dipole antennas employed at the transmit and receive end of a MIMO system can achieve a three-fold increase in channel capacity with respect to analogous arrays of linearly polarized antennas. (via Semantic Scholar)
UN Sustainable Development Goal Categories
16. Peace, Justice and Strong Institutions (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2008 conference paper

On the design of telemetry coils and implantable small antennas for a retinal prosthesis to restore partial vision to the blind

2008 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, 592–594. [Piscataway, NJ]: IEEE.

By: G. Lazzi, A. Qusba & V. Singh

Source: NC State University Libraries
Added: August 6, 2018

2008 conference paper

On the use of vector antennas embedded on fabric as frequency selective surfaces

2008 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, 1208–1211.

By: G. Gupta n, A. Rajagopalan n, B. Pourdeyhimi n & G. Lazzi n

UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2008 article

Optimal Front-End Design for MIMO Receivers

GLOBECOM 2008 - 2008 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE.

By: C. Domizioli n, B. Hughes n, K. Gard n & G. Lazzi n

TL;DR: A circuit model for a noisy MIMO receiver front-end that includes arbitrary coupling and noise correlation is presented, and the noise figure for two-port networks is extended to multiport networks, from which theorems for optimal front- end design are derived. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2007 journal article

Increasing channel capacity of an ultrawideband MIMO system using vector antennas

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 55(10), 2880–2887.

By: A. Rajagopalan n, G. Gupta n, A. Konanur*, B. Hughes n & G. Lazzi n

author keywords: multiple-input multiple-output (MIMO) antenna; multiple-input multiple-output (MIMO) channel capacity; ultrawideband (UWB) antenna; vector antenna
TL;DR: Channel capacity calculations performed with the antenna operating in a rich scattering environment show that spectral efficiency of the UWB vector antenna system approaches that of the traditional spatial array. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2006 journal article

Cole-Cole dispersion models for aqueous gelatin-syrup dielectric composites

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 44(2), 351–355.

By: P. Buff n, M. Steer n & G. Lazzi n

author keywords: Cole-Cole; dielectric composite; gelatin; soil
TL;DR: A dielectric composite that comprises gelatin, high fructose corn syrup, NaCl, and water, and can be used to model soils, loams, and sands in the 200-MHz to 20-GHz range is developed. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2006 journal article

Tunable waveguiding in electrically programmable VO2-based photonic crystals

JOURNAL OF APPLIED PHYSICS, 99(11).

By: D. Xiao n, K. Kim n, G. Lazzi n & J. Zavada*

Source: Web Of Science
Added: August 6, 2018

2005 journal article

Impedance matching and implementation of planar space-filling dipoles as intraocular implanted antennas in a retinal prosthesis

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 53(8), 2365–2373.

By: K. Gosalia*, M. Humayun* & G. Lazzi n

author keywords: implanted antennas; miniature antennas; planar meander dipole antennas; retinal prosthesis
TL;DR: It is demonstrated that such compact meander dipoles can perform better than previously reported microstrip patch antennas as intraocular elements for a retinal prosthesis. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2005 journal article

Increasing wireless channel capacity through MIMO systems employing co-located antennas

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 53(6), 1837–1844.

By: A. Konanur n, K. Gosalia n, S. Krishnamurthy n, B. Hughes n & G. Lazzi n

author keywords: loop antenna; multiple-input multiple-output (MIMO) antenna; vector antenna
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2005 journal article

Thermal effects of bioimplants

IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE, 24(5), 75–81.

By: G. Lazzi n

MeSH headings : Animals; Body Temperature; Burns / etiology; Burns / physiopathology; Computer Simulation; Energy Transfer; Equipment Failure Analysis / methods; Hot Temperature / adverse effects; Humans; Models, Biological; Prosthesis Failure; Risk Assessment / methods; Risk Factors; Thermography / methods
TL;DR: The effects of various parameters on the temperature increase in the human body tissue are considered, with a focus on a specific proposed implant: a dual-unit retinal prosthesis to restore partial vision to the blind. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2004 journal article

Investigation of a microwave data telemetry link for a retinal prosthesis

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 52(8), 1925–1933.

By: K. Gosalia n, G. Lazzi n & M. Humayun*

author keywords: antenna coupling; data telemetry; dosimetry; retinal prosthesis
TL;DR: It is observed that the eyeball acts as a dielectric lens for the implanted antenna, thus improving the coupling between the extraocular and intraocular antennas, and specific absorption rate (SAR) computations are performed at both the frequencies, and the peak 1-g SAR value is calculated. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2004 article

Special issue on medical applications and biological effects of RF/microwaves - Guest editorial

Lazzi, G., Gandhi, O. P., & Ueno, S. (2004, August). IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, Vol. 52, pp. 1853–1855.

By: G. Lazzi n, O. Gandhi* & S. Ueno*

Source: Web Of Science
Added: August 6, 2018

2004 journal article

Thermal elevation in the human eye and head due to the operation of a retinal prosthesis

IEEE Transactions on Biomedical Engineering, 51(8), 1469–1477.

By: K. Gosalia, J. Weiland, M. Humayun & G. Lazzi

Source: NC State University Libraries
Added: August 6, 2018

2004 journal article

Use of the FDTD thin-strut formalism for biomedical telemetry coil designs

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 52(8), 1952–1956.

By: S. Schmidt n & G. Lazzi n

author keywords: biomedical telemetry; coils; electromagnetic coupling; finite-difference time-domain (FDTD) methods; numerical stability; thin-strut formulation
TL;DR: Results indicate that the thin-strut FDTD formulation, applied to the calculation of current coupling between telemetry coils, is in closer agreement to the analytical approximation than is the standard FDTD code. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2003 journal article

A modified unsplit PML formulation for evanescent mode absorption in waveguides

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, 13(6), 220–222.

By: M. Ozkar n, G. Lazzi n & A. Mortazawi*

author keywords: evanescent waves; FDTD; unsplit PML
Source: Web Of Science
Added: August 6, 2018

2003 journal article

An arbitrary waveform stimulus circuit for visual prostheses using a low-area multibias DAC

IEEE JOURNAL OF SOLID-STATE CIRCUITS, 38(10), 1679–1690.

author keywords: age-related macular degeneration; digital-to-analog converter (DAC); electrical stimulation; retinal prosthesis; retinitis pigmentosa; visual prosthesis
TL;DR: Improvements to conventional circuit designs with significantly decreased implementation area and the ability to support arbitrary stimulus waveforms where an array of such stimulus circuits is required are described. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2003 journal article

Computed SAR and thermal elevation in a 0.25-mm 2-D model of the human eye and head in response to an implanted retinal stimulator - Part I: Models and methods

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 51(9), 2274–2285.

author keywords: age-related macular degeneration; finite-difference time domain (FDTD); retina prosthesis; retinitis pigmentosa; specific absorption rate (SAR); stimulator IC; temperature; thermal simulation
TL;DR: Methods and models used to estimate the heating induced in the human eye and surrounding head tissues subject to the operation of this retinal prosthesis and comparison with in vivo experimental measurements on intraocular heating in dog eyes shows good agreement. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2003 journal article

Computed SAR and thermal elevation in a 0.25-mm 2-D model of the human eye and head in response to an implanted retinal stimulator - Part II: Results

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 51(9), 2286–2295.

author keywords: age-related macular degeneration; finite-difference time domain (FDTD); retina prosthesis; retinitis pigmentosa; specific absorption rate (SAR); stimulator IC; temperature; thermal simulation
TL;DR: Methods and models used to estimate the heating induced in the human eye and surrounding head tissues subject to the operation of this retinal prosthesis and comparison with in vivo experimental measurements on intraocular heating in dog eyes shows good agreement. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2003 journal article

Extension and validation of a perfectly matched layer formulation for the unconditionally stable D-H FDTD method

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, 13(8), 345–347.

By: S. Schmidt n & G. Lazzi n

author keywords: ADI; FDTD methods; PML ABC
Source: Web Of Science
Added: August 6, 2018

2003 journal article

Reduced size, dual-polarized microstrip patch antenna for wireless communications

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 51(9), 2182–2186.

By: K. Gosalia n & G. Lazzi n

author keywords: compact microstrip antenna; dual polarization
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2003 journal article

Two-dimensional SPICE-linked multiresolution impedance method for low-frequency electromagnetic interactions

IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, 50(7), 881–889.

By: M. Eberdt n, P. Brown n & G. Lazzi n

author keywords: dosimetry; electromagnetic modeling; induced fields; numerical modeling
MeSH headings : Animals; Brain / physiology; Computer Simulation; Electric Impedance; Electric Stimulation; Electrodes; Electromagnetic Fields; Eye; Finite Element Analysis; Humans; Models, Biological; Muscles / physiology; Radiometry / methods; Reproducibility of Results; Retina / physiology; Sensitivity and Specificity; Software
TL;DR: Results indicate that the multiresolution mesh generation scheme can provide a 50%-80% reduction in cell count, providing new opportunities for the solution of low-frequency bioelectromagnetic problems that require a high level of detail only in specific regions of the modeling space. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2002 journal article

Retinal prosthesis for the blind

Survey of Ophthalmology, 47(4), 335–356.

By: E. Margalit, M. Maia, J. Weiland, R. Greenberg*, G. Fujii, G. Torres, D. Piyathaisere, T. O'Hearn ...

MeSH headings : Blindness / therapy; Electric Stimulation / instrumentation; Humans; Implants, Experimental; Optic Nerve Diseases / therapy; Photic Stimulation / instrumentation; Prosthesis Design; Retinal Diseases / therapy; Safety
TL;DR: Cortical prostheses will be described only because of their direct effect on the concept and technical development of the other prostheses, and this will be done in a more general and historic perspective. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: NC State University Libraries
Added: August 6, 2018

2001 journal article

Unconditionally stable D-H FDTD formulation with anisotropic PML boundary conditions

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, 11(4), 149–151.

By: G. Lazzi n

author keywords: ADI; FDTD methods; PML
Source: Web Of Science
Added: August 6, 2018

2000 journal article

A mixed FDTD-integral equation approach for on-site safety assessment in complex electromagnetic environments

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 48(12), 1830–1836.

By: G. Lazzi* & O. Gandhi*

author keywords: dosimetry; finite-difference time-domain (FDTD) methods; synthetic aperture radar (SAR) computation
TL;DR: A mixed finite-difference time-domain (FDTD)-integral equation approach for the evaluation of the power deposition in the human body model immersed in a complex electromagnetic environment is proposed and the application to the dosimetry of cellular telephone base station antennas is presented to show its versatility and ease of use. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2000 journal article

Use of PML absorbing layers for the truncation of the head model in cellular telephone simulations

IEEE Transactions on Microwave Theory and Techniques, 48(11 pt.2), 2033–2039.

By: G. Lazzi, O. Gandhi & D. Sullivan

Source: NC State University Libraries
Added: August 6, 2018

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