Publications 1993 2017

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  • 73 Conference contribution
  • 73 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: Research - peer-reviewArticle

rectangular waveguides
ferrites
antennas
Rectangular waveguides
Ferrite
2016
1 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: Research - peer-reviewArticle

Iron oxides
Dielectric properties
Nanoparticles
Composite materials
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: Research - peer-reviewArticle

Nanostructures
Composite materials
ferric oxide
Iron oxides
Fillers
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: Research - peer-reviewArticle

antennas
pixels
Metamaterials
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: Research - peer-reviewArticle

finite element method
electromagnetism
simulation
Finite element method
Galerkin method
1 Citations
Magnetic materials
Waveguides
Microwaves
magnetic materials
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: Research - peer-reviewArticle

finite element method
Galerkin methods
Finite element method
Galerkin method
Communication
9 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: Research - peer-reviewArticle

Nanoparticles
Citric Acid
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: Research - peer-reviewArticle

apertures
waveguides
Waveguides
reflectance
coefficients
20 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: Research - peer-reviewArticle

Nanoribbons
Graphene
Nanostructures
Permittivity
Composite materials
2012
19 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: Research - peer-reviewArticle

Radar imaging
Antenna arrays
Ultra-wideband (UWB)
Imaging systems
Radar
5 Citations
acoustic scattering
method of moments
integral equations
Equations
Generalized Method of Moments
3 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: Research - peer-reviewArticle

Finite element method
Polynomials
Antennas
2011
41 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: Research - peer-reviewArticle

Silicon Dioxide
Dielectric properties
Polymers
Iron
Nanoparticles

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: Research - peer-reviewArticle

patch antennas
antennas
curvature
cavities
Microstrip antennas
44 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: Research - peer-reviewArticle

Nanoribbons
Graphene
Permittivity
Composite materials
Carbon Nanotubes
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: Research - peer-reviewArticle

convolution integrals
expansion
evaluation
Convolution
costs
47 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: Research - peer-reviewArticle

Radar imaging
Imaging systems
Imaging techniques
Air
imaging radar
22 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: Research - peer-reviewArticle

Antennas
Capacitors
Capacitance
28 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: Research - peer-reviewArticle

radar
pulses
Radar systems
Radar
Imaging techniques
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: Research - peer-reviewArticle

finite element method
Finite element method
Helmholtz equations
flexibility
inhomogeneity
20 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: Research - peer-reviewArticle

iron oxides
zinc oxides
radio frequencies
nanocomposites
surfactants
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: Research - peer-reviewArticle

finite element method
antennas
broadband
propagation
Microstrip lines
4 Citations
Polymers
Permittivity
Microwaves
Finite element method
Kinetics

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: Research - peer-reviewArticle

Dielectric relaxation
Curing
Temperature
2,2-bis(4-glycidyloxyphenyl)propane
curing
2008
9 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: Research - peer-reviewArticle

rails
synthetic aperture radar
superhigh frequencies
radar
sensitivity
30 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: Research - peer-reviewArticle

Electromagnetic shielding
Shielding
Polymers
Composite materials
Electromagnetic compatibility
43 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: Research - peer-reviewArticle

dielectric properties
nanocomposites
nanoparticles
polymers
Dielectric properties
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: Research - peer-reviewArticle

Rectangular waveguides
Permittivity
Uncertainty
Waveguides
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: Research - peer-reviewArticle

finite element method
antennas
simulation
Antennas
Finite element method
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: Research - peer-reviewArticle

carbon nanotubes
permittivity
composite materials
polymers
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: Research - peer-reviewArticle

36 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: Research - peer-reviewArticle

Slot antennas
Microstrip antennas
Method of moments
Integral equations
Substrates
1 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: Research - peer-reviewArticle

boundary integral method
prisms
formulations
cavities
Prisms
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: Research - peer-reviewArticle

linear arrays
antennas
radiation
Antennas
Radiation
31 Citations
Continuous wave radar
Radar imaging
Synthetic aperture radar
Transceivers
Costs
8 Citations
Fourier Analysis
Convolution
Fast Fourier transforms
Damping
2005
8 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: Research - peer-reviewArticle

Microwave frequencies
Dielectric properties
Amines
Temperature
Epoxy Resins
17 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: Research - peer-reviewArticle

Epoxy Resins
Microwaves
Epoxy resins
Temperature
Microwave frequencies
20 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: Research - peer-reviewArticle

rectangular waveguides
electromagnetism
Material Characterization
Waveguide
Rectangular waveguides

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: Research - peer-reviewArticle

Applicators
Microwaves
Electric fields
Polymers
Processing
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: Research - peer-reviewArticle

Epoxy Resins
Microwave frequencies
Crosslinking
Dielectric properties
Curing
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: Research - peer-reviewArticle

Antennas
Finite element method
Slot antennas
Microstrip antennas
Mountings
84 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: Research - peer-reviewArticle

Frequency selective surfaces
MEMS
selective surfaces
microelectromechanical systems
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: Research - peer-reviewArticle

patch antennas
curved surfaces
microstrip antennas
antennas
Microstrip 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: Research - peer-reviewArticle

patch antennas
curved surfaces
microstrip antennas
antennas
Microstrip antennas
60 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: Research - peer-reviewArticle

Polymers
Microwaves
Processing
polymer chemistry
microwaves
30 Citations

E-Pulse Diagnostics of Simple Layered Materials

Stenholm, G. J., Rothwell, E. J., Nyquist, D. P., Kempel, L. C. & Frasch, L. L. Dec 2003 In : IEEE Transactions on Antennas and Propagation. 51, 12, p. 3221-3227 7 p.

Research output: Research - peer-reviewArticle

Permittivity