Publications 1993 2017

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  • 75 Conference contribution
  • 74 Article
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2017

Characterization of Y-Bias Ferrite Materials For Tunable Antenna Applications Using A Partially-Filled Rectangular Waveguide

Tang, J., Tayebi, A., Crowgey, B., Rothwell, E., Shanker, B., Kempel, L. & Havrilla, M. Aug 5 2017 (Accepted/In press) In : IEEE Transactions on Antennas and Propagation.

Research output: Contribution to journalArticle

Rectangular waveguides
rectangular waveguides
Ferrite
ferrites
antennas
2016
2 Citations

Core/Shell Iron/Oxide Nanoparticles for Improving the Magneto-Dielectric Properties of Polymer Composites

Yang, T. I., Chuang, C. Y., Yang, S. C., Kempel, L. C. & Kofinas, P. Jan 1 2016 In : Advanced Engineering Materials. 18, 1, p. 121-126 6 p.

Research output: Contribution to journalArticle

Iron oxides
iron oxides
Dielectric properties
dielectric properties
Polymers
2 Citations

Stretchable magneto-dielectric composites based on raspberry-shaped iron oxide nanostructures

Vural, M., Gerber, O., Pichon, B. P., Lemonnier, S., Barraud, E., Kempel, L. C., Begin-Colin, S. & Kofinas, P. Mar 28 2016 In : Journal of Materials Chemistry C. 4, 12, p. 2345-2352 8 p.

Research output: Contribution to journalArticle

Iron oxides
Nanostructures
Composite materials
Ferrosoferric Oxide
Elastomers
2015
6 Citations

A multilayered metamaterial-inspired miniaturized dynamically tunable antenna

Myers, J. C., Chahal, P., Rothwell, E. & Kempel, L. Apr 1 2015 In : IEEE Transactions on Antennas and Propagation. 63, 4, p. 1546-1553 8 p., 7027210

Research output: Contribution to journalArticle

Metamaterials
antennas
Pixels
pixels
Antennas
2014
2 Citations

A hybrid vector generalized finite-element method for transient electromagnetic simulations

Tuncer, O., Shanker, B. & Kempel, L. C. Apr 3 2014 In : Electromagnetics. 34, 3-4, p. 286-297 12 p.

Research output: Contribution to journalArticle

finite element method
electromagnetism
Finite element method
Galerkin method
Galerkin methods
2 Citations
Magnetic materials
magnetic materials
Waveguides
Microwaves
waveguides
3 Citations

Discontinuous galerkin inspired framework for vector generalized finite-element methods

Tuncer, O., Shanker, B. & Kempel, L. C. 2014 In : IEEE Transactions on Antennas and Propagation. 62, 3, p. 1339-1347 9 p., 6689302

Research output: Contribution to journalArticle

Galerkin methods
finite element method
Galerkin method
Finite element method
penalties
10 Citations

Nanostructured flexible magneto-dielectrics for radio frequency applications

Vural, M., Crowgey, B., Kempel, L. C. & Kofinas, P. Jan 28 2014 In : Journal of Materials Chemistry C. 2, 4, p. 756-763 8 p.

Research output: Contribution to journalArticle

Citric Acid
Nanoparticles
Heterojunctions
Composite materials
Saturation magnetization
2013
6 Citations

Characterization of biaxial anisotropic material using a reduced aperture waveguide

Crowgey, B. R., Tuncer, O., Tang, J., Rothwell, E. J., Shanker, B., Kempel, L. C. & Havrilla, M. J. 2013 In : IEEE Transactions on Instrumentation and Measurement. 62, 10, p. 2739-2750 12 p., 6544638

Research output: Contribution to journalArticle

Waveguides
apertures
waveguides
reflectance
Parameter extraction
25 Citations

Permittivity of dielectric composite materials comprising graphene nanoribbons. the effect of nanostructure

Dimiev, A., Zakhidov, D., Genorio, B., Oladimeji, K., Crowgey, B., Kempel, L., Rothwell, E. J. & Tour, J. M. Aug 14 2013 In : ACS Applied Materials and Interfaces. 5, 15, p. 7567-7573 7 p.

Research output: Contribution to journalArticle

Nanoribbons
Carbon Nanotubes
Graphite
Graphene
Nanostructures
2012
25 Citations

A through-dielectric ultrawideband (UWB) switched-antenna-array radar imaging system

Charvat, G. L., Kempel, L. C., Rothwell, E. J., Coleman, C. M. & Mokole, E. L. Nov 1 2012 In : IEEE Transactions on Antennas and Propagation. 60, 11, p. 5495-5500 6 p., 6236029

Research output: Contribution to journalArticle

imaging radar
Radar imaging
antenna arrays
Antenna arrays
Ultra-wideband (UWB)
5 Citations
acoustic scattering
method of moments
integral equations
sonar
ingredients
4 Citations

Tetrahedral-based vector generalized finite element method and its applications

Tuncer, O., Shanker, B. & Kempel, L. C. 2012 In : IEEE Antennas and Wireless Propagation Letters. 11, p. 945-948 4 p., 6269044

Research output: Contribution to journalArticle

Finite element method
Polynomials
Antennas
2011
45 Citations

Controlled synthesis of core-shell iron-silica nanoparticles and their magneto-dielectric properties in polymer composites

Yang, T. I., Brown, R. N. C., Kempel, L. C. & Kofinas, P. Mar 11 2011 In : Nanotechnology. 22, 10, 105601

Research output: Contribution to journalArticle

Silicon Dioxide
Dielectric properties
Polymers
Iron
Silica

Effect of curvature on the performance of a cylindrically-conformal cavity-backed E-patch antenna

Gardner, C. M., Rothwell, E. J., Kempel, L. C., Hejase, J. A., Ouedraogo, R. O. & Schneider, S. W. 2011 In : Applied Computational Electromagnetics Society Journal. 26, 11, p. 930-936 7 p.

Research output: Contribution to journalArticle

patch antennas
Microstrip antennas
antennas
curvature
Antennas
49 Citations

Low-loss, high-permittivity composites made from graphene nanoribbons

Dimiev, A., Lu, W., Zeller, K., Crowgey, B., Kempel, L. C. & Tour, J. M. Dec 28 2011 In : ACS Applied Materials and Interfaces. 3, 12, p. 4657-4661 5 p.

Research output: Contribution to journalArticle

Nanoribbons
Carbon Nanotubes
Graphite
Graphene
Permittivity
2010
4 Citations

Accelerated Cartesian expansion (ACE) based framework for the rapid evaluation of diffusion, lossy wave, and Klein-Gordon potentials

Vikram, M., Baczewski, A., Shanker, B. & Kempel, L. Dec 10 2010 In : Journal of Computational Physics. 229, 24, p. 9119-9134 16 p.

Research output: Contribution to journalArticle

Convolution
convolution integrals
expansion
evaluation
costs
53 Citations

A through-dielectric radar imaging system

Charvat, G. L., Kempel, L. C., Rothwell, E. J., Coleman, C. M. & Mokole, E. L. Aug 2010 In : IEEE Transactions on Antennas and Propagation. 58, 8, p. 2594-2603 10 p., 5466037

Research output: Contribution to journalArticle

imaging radar
Radar imaging
Continuous wave radar
Imaging systems
slabs
24 Citations

Beam steering of a half-width microstrip leaky-wave antenna using edge loading

Archbold, M., Rothwell, E. J., Kempel, L. C. & Schneider, S. W. 2010 In : IEEE Antennas and Wireless Propagation Letters. 9, p. 203-206 4 p., 5430969

Research output: Contribution to journalArticle

Antennas
Capacitors
Capacitance
29 Citations

Comparison of uwb short-pulse and stepped-frequency radar systems for imaging through barriers

Crowgey, B. R., Rothwell, E. J., Kempel, L. C. & Mokole, E. L. 2010 In : Progress in Electromagnetics Research. 110, p. 403-419 17 p.

Research output: Contribution to journalArticle

Radar systems
radar
Radar
Imaging techniques
pulses
14 Citations

Further development of vector generalized finite element method and its hybridization with boundary integrals

Tuncer, O., Lu, C., Nair, N. V., Shanker, B. & Kempel, L. C. Mar 2010 In : IEEE Transactions on Antennas and Propagation. 58, 3, p. 887-899 13 p., 5372011

Research output: Contribution to journalArticle

finite element method
Finite element method
Helmholtz equation
Helmholtz equations
flexibility
22 Citations

Surfactant-modified nickel zinc iron oxide/polymer nanocomposites for radio frequency applications

Yang, T. I., Brown, R. N. C., Kempel, L. C. & Kofinas, P. Oct 2010 In : Journal of Nanoparticle Research. 12, 8, p. 2967-2978 12 p.

Research output: Contribution to journalArticle

Nanocomposites
Surfactant
Nickel
Zinc
Zinc oxide
2009
5 Citations

Broadband microstrip leaky wave antenna with inhomogeneous materials

Jiang, H., Penno, R., Pasala, K. M., Kempel, L. & Schneider, S. 2009 In : IEEE Transactions on Antennas and Propagation. 57, 5, p. 1557-1561 5 p.

Research output: Contribution to journalArticle

Microstrip lines
finite element method
antennas
Antennas
broadband
4 Citations
Polymers
finite element method
Permittivity
curing
Microwaves
1 Citations

Dielectric relaxation of curing DGEBA/mPDA system at 2.45 GHz

Zobg, L., Hawley, M. C., Sun, R. & Kempel, L. C. May 2009 In : Journal of Thermoplastic Composite Materials. 22, 3, p. 249-257 9 p.

Research output: Contribution to journalArticle

Dielectric relaxation
curing
Curing
Epoxy Resins
bisphenols
2008
11 Citations

A Low-Power High-Sensitivity X-Band Rail SAR Imaging System

Charvat, G. L. & Kempel, L. C. Jun 8 2008 In : IEEE Antennas and Propagation Magazine. 50, 3, p. 108-115 8 p.

Research output: Contribution to journalArticle

Radar imaging
rails
synthetic aperture radar
Synthetic aperture radar
superhigh frequencies
31 Citations

Conductive polymer composite materials and their utility in electromagnetic shielding applications

Fox, R. T., Wani, V., Howard, K. E., Bogle, A. & Kempel, L. Feb 15 2008 In : Journal of Applied Polymer Science. 107, 4, p. 2558-2566 9 p.

Research output: Contribution to journalArticle

Electromagnetic shielding
Shielding
Polymers
Composite materials
Electromagnetic compatibility
45 Citations

Magneto-dielectric properties of polymer- Fe3O4 nanocomposites

Yang, T. I., Brown, R. N. C., Kempel, L. C. & Kofinas, P. Nov 2008 In : Journal of Magnetism and Magnetic Materials. 320, 21, p. 2714-2720 7 p.

Research output: Contribution to journalArticle

Dielectric properties
dielectric properties
Nanocomposites
nanocomposites
Polymers
2 Citations

On the uncertainty of extracted permittivity from inhomogeneously filled rectangular waveguides

Barba, P., Bogle, A. E. & Kempel, L. C. 2008 In : IEEE Antennas and Wireless Propagation Letters. 7, p. 329-331 3 p., 928482

Research output: Contribution to journalArticle

Rectangular waveguides
Permittivity
Waveguides
Uncertainty
1 Citations

Simulation of microstrip leaky-wave antennas on inhomogeneous substrates using transverse resonance and finite element methods

Jaramillo-Henao, C. A., Kempel, L. C. & Schneider, S. W. Jan 2008 In : Electromagnetics. 28, 1-2, p. 27-41 15 p.

Research output: Contribution to journalArticle

finite element method
antennas
Antennas
Finite element method
Substrates
2007
9 Citations
Pulse generators
Fourier analysis
Electric network analyzers
Calibration
Sampling
4 Citations
Fourier Analysis
Convolution
Fast Fourier transforms
12 Citations

Tunable permittivity of polymer composites through incremental blending of raw and functionalized single-wall carbon nanotubes

Higginbotham, A. L., Stephenson, J. J., Smith, R. J., Killips, D. S., Kempel, L. C. & Tour, J. M. Dec 6 2007 In : Journal of Physical Chemistry C. 111, 48, p. 17751-17754 4 p.

Research output: Contribution to journalArticle

Carbon Nanotubes
Carbon nanotubes
Polymers
Permittivity
carbon nanotubes
2006
3 Citations

E-pulse discrimination of R-cards in a layered environment

Rothwell, E. J., Kempel, L. C. & Frasch, L. L. Jul 2006 In : IEEE Transactions on Antennas and Propagation. 54, 7, p. 2175-2178 4 p.

Research output: Contribution to journalArticle

38 Citations

Method of moments solution for a printed patch/slot antenna on a thin finite dielectric substrate using the volume integral equation

Makarov, S. N., Kulkarni, S. D., Marut, A. G. & Kempel, L. C. Apr 2006 In : IEEE Transactions on Antennas and Propagation. 54, 4, p. 1174-1184 11 p.

Research output: Contribution to journalArticle

Slot antennas
Microstrip antennas
Method of moments
Integral equations
Substrates
2 Citations

Mixed element formulation for the finite element-boundary integral method

Meese, J., Kempel, L. C. & Schneider, S. W. Mar 2006 In : Applied Computational Electromagnetics Society Journal. 21, 1, p. 51-62 12 p.

Research output: Contribution to journalArticle

boundary integral method
Prisms
prisms
formulations
radar cross sections
7 Citations

Radiation by a linear array of half-width leaky-wave antennas

Killips, D., Radcliffe, J., Kempel, L. & Schneider, S. Nov 2006 In : Applied Computational Electromagnetics Society Journal. 21, 3, p. 248-254 7 p.

Research output: Contribution to journalArticle

linear arrays
antennas
Antennas
Radiation
radiation
31 Citations

Synthetic aperture radar imaging using a unique approach to frequency-modulated continuous-wave radar design

Charvat, G. L. & Kempel, L. C. Feb 2006 In : IEEE Antennas and Propagation Magazine. 48, 1, p. 171-177 7 p.

Research output: Contribution to journalArticle

Continuous wave radar
Radar imaging
Synthetic aperture radar
Transceivers
Gunn oscillators
8 Citations
Fourier Analysis
Convolution
Fast Fourier transforms
Damping
2005
9 Citations

Dielectric properties of an epoxy-amine system at a high microwave frequency

Zong, L., Zhou, S., Sgriccia, N., Hawley, M. C., Sun, R. & Kempel, L. C. Dec 2005 In : Polymer Engineering and Science. 45, 12, p. 1576-1580 5 p.

Research output: Contribution to journalArticle

Microwave frequencies
Dielectric properties
Amines
Epoxy Resins
Dielectric losses
18 Citations

Dielectric studies of three epoxy resin systems during microwave cure

Zong, L., Kempel, L. C. & Hawley, M. C. Mar 24 2005 In : Polymer. 46, 8, p. 2638-2645 8 p.

Research output: Contribution to journalArticle

Epoxy Resins
Epoxy resins
Microwaves
Microwave frequencies
Dielectric properties
22 Citations

Electromagnetic material characterization using a partially-filled rectangular waveguide

Bogle, A., Havrilla, M., Nyquis, D., Kempel, L. & Rothwell, E. 2005 In : Journal of Electromagnetic Waves and Applications. 19, 10, p. 1291-1306 16 p.

Research output: Contribution to journalArticle

Material Characterization
Rectangular waveguides
rectangular waveguides
Waveguide
electromagnetism

Electromagnetic modeling of an adaptable multimode microwave applicator for polymer processing

Sun, R., Kempel, L. C., Zong, L., Zhou, S. & Hawley, M. C. Mar 2005 In : Applied Computational Electromagnetics Society Journal. 20, 1, p. 43-48 6 p.

Research output: Contribution to journalArticle

Applicators
Microwaves
Electric fields
electromagnetism
microwaves
2004
25 Citations

Dielectric analysis of a crosslinking epoxy resin at a high microwave frequency

Zong, L., Zhou, S., Sun, R., Kempel, L. C. & Hawley, M. C. Aug 1 2004 In : Journal of Polymer Science, Part B: Polymer Physics. 42, 15, p. 2871-2877 7 p.

Research output: Contribution to journalArticle

Epoxy Resins
Microwave frequencies
epoxy resins
crosslinking
microwave frequencies

Introduction to the special issue on finite element methods for microwave engineering

Kempel, L. & Balanis, C. Jan 1 2004 In : Electromagnetics. 24, 1-2, p. 1-2 2 p.

Research output: Contribution to journalArticle

finite element method
Microwaves
engineering
Finite element method
microwaves
14 Citations

Modeling conformal antennas on metallic prolate spheroid surfaces using a hybrid finite element method

Macon, C. A., Kempel, L. C., Schneider, S. W. & Trott, K. D. Mar 2004 In : IEEE Transactions on Antennas and Propagation. 52, 3, p. 750-758 9 p.

Research output: Contribution to journalArticle

Antennas
Finite element method
Slot antennas
Microstrip antennas
Mountings
90 Citations

Switchable low-loss RF MEMS Ka-band frequency-selective surface

Schoenlinner, B., Abbaspour-Tamijani, A., Kempel, L. C. & Rebeiz, G. M. Nov 2004 In : IEEE Transactions on Microwave Theory and Techniques. 52, 11, p. 2474-2481 8 p.

Research output: Contribution to journalArticle

Frequency selective surfaces
selective surfaces
microelectromechanical systems
MEMS
air cooling
2003
9 Citations

A practical approach to modeling doubly curved conformal microstrip antennas

Macon, C. A., Trott, K. D. & Kempel, L. C. 2003 In : Progress in Electromagnetics Research. 40, p. 295-314 20 p.

Research output: Contribution to journalArticle

patch antennas
curved surfaces
microstrip antennas
Microstrip antennas
antennas
1 Citations

A practical approach to modeling doubly curved conformal microstrip antennas-abstract

Macon, C. A., Trott, K. D. & Kempel, L. C. 2003 In : Journal of Electromagnetic Waves and Applications. 17, 8, p. 1161-1163 3 p.

Research output: Contribution to journalArticle

patch antennas
curved surfaces
microstrip antennas
Microstrip antennas
Insulator Elements
61 Citations

A Review of Microwave-Assisted Polymer Chemistry (MAPC)

Zong, L., Zhou, S., Sgriccia, N., Hawley, M. C. & Kempel, L. C. 2003 In : Journal of Microwave Power and Electromagnetic Energy. 38, 1, p. 49-74 26 p.

Research output: Contribution to journalArticle

polymer chemistry
Polymers
Microwaves
microwaves
Processing