Publications 1993 2017

  • 19 h-Index
  • 73 Conference contribution
  • 73 Article
  • 2 Chapter
2017
ferrites
Ferrite
rectangular waveguides
antennas
waveguides
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: Contribution to journalArticle

Composite materials
composite materials
Iron
Polymers
iron oxides

Radiation properties of a rectangular patch antenna loaded with a magnetoelectric material

Kempel, L., Shanker, B. & Vittoria, C. Oct 25 2016 2016 IEEE Antennas and Propagation Society International Symposium, APSURSI 2016 - Proceedings. Institute of Electrical and Electronics Engineers Inc., p. 1731-1732 2 p. 7696572

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Radiation
patch antennas
permeability
antennas
electric fields
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

Nanostructures
Composite materials
Iron oxides
Fillers
Magnetite
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

antennas
pixels
Pixels
Antennas
grids

Distributed linear antenna array pattern performance enhancement

Adrian, A. & Kempel, L. C. Oct 22 2015 2015 IEEE Antennas and Propagation Society International Symposium, APS 2015 - Proceedings. Institute of Electrical and Electronics Engineers Inc., Vol. 2015-October, p. 2497-2498 2 p. 7305637

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Array processing
Antenna arrays

Longitudinal groove loading of a half-width microstrip leaky-wave antenna

Oladimeji, K., Frasch, J., Rothwell, E. & Kempel, L. Oct 21 2015 2015 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), USNC-URSI 2015 - Proceedings. Institute of Electrical and Electronics Engineers Inc., p. 40 1 p. 7303324

Research output: Chapter in Book/Report/Conference proceedingConference contribution

communication system
nature
structure
Antennas
Microstrip 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

Abdominal Injuries
finite element method
Finite element method
Galantamine
Dietary Cholesterol
1 Citations
Magnetic properties
Electric properties
Waveguides
magnetic properties
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

finite element method
Finite element method
Galerkin method
Galerkin methods
penalties

Gyromagnetic material characterization and error analysis using a partially-filled waveguide technique

Tang, J., Crowgey, B. R., Rothwell, E. J., Shanker, B., Kempel, L. C. & Havrilla, M. Nov 12 2014 2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), USNC-URSI 2014 - Proceedings. Institute of Electrical and Electronics Engineers Inc., p. 9 1 p. 6955391

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Mechanical testing
Error analysis
Tensors
Waveguides
Antennas
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: Contribution to journalArticle

Nanoparticles
Myosins
Heterojunctions
Composite materials
Saturation magnetization
2013
4 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

apertures
waveguides
coefficients
Waveguides
electromagnetic properties

Characterization of gyromagnetic materials using a partially-filled waveguide technique

Tang, J., Crowgey, B. R., Tuncer, O., Rothwell, E. J., Shanker, B., Kempel, L. C. & Havrilla, M. 2013 2013 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), USNC-URSI 2013 - Proceedings. p. 227 1 p. 6715531

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Tensors
Waveguides
Permittivity

GMM: A flexible framework for including multiple approximation functions in integral equation solvers

Dault, D., Nair, N. V., Shanker, B. & Kempel, L. C. 2013 2013 International Symposium on Electromagnetic Theory, EMTS 2013 - Proceedings. p. 151-154 4 p. 6565700

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Method of moments
Integral equations
Requirements engineering
Scattering
19 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

Composite materials
Permittivity
Methacholine Compounds
Fillers
Nanostructures
2012
1 Citations

A discontinuous Galerkin framework for hybridizing VGFEM and FEM

Tuncer, O., Shanker, B. & Kempel, L. C. 2012 IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). 6349013

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Finite element method
Galerkin methods
Waveguides
Scattering
2 Citations

A flexible framework for the solution to surface scattering problems using integral equations

Dault, D., Nair, N. V., Shanker, B. & Kempel, L. C. 2012 Proceedings of the 2012 International Conference on Electromagnetics in Advanced Applications, ICEAA'12. p. 148-151 4 p. 6328611

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Method of moments
Integral equations
Triangulation
Geometry
Surface scattering
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: Contribution to journalArticle

Antenna arrays
slabs
Radar imaging
Imaging systems
Radar
5 Citations
integral equations
Equations
acoustic scattering
sonar
method of moments

Measurement of anisotropic material properties for antenna applications

Crowgey, B., Tang, J., Tuncer, O., Kempel, L., Rothwell, E. & Shanker, B. 2012 LAPC 2012 - 2012 Loughborough Antennas and Propagation Conference. 6402939

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Scattering parameters
Materials properties
Antennas
Rectangular waveguides

Radiation of a circularly-polarized microstrip antenna through an uniaxial superstrate: A preliminary study

Ahmed, F., Al-Sulaifanie, B. K. M., Crowgey, B., Rothwell, E., Shanker, B. & Kempel, L. 2012 LAPC 2012 - 2012 Loughborough Antennas and Propagation Conference. 6402970

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Radiation
Microstrip antennas
Polarization
Antennas
Circular polarization
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: Contribution to journalArticle

Finite element method
Polynomials
Antennas
2011
2 Citations

A discretization framework for scalar integral equations using the generalized method of moments and locally smooth surface approximations

Nair, N. V., Shanker, B. & Kempel, L. 2011 IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). p. 3193-3196 4 p. 5997212

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Method of moments
Integral equations
Acoustics
Scattering
3 Citations

A hybrid discontinuous Galerkin-vector generalized finite element method for electromagnetics

Tuncer, O., Shanker, B. & Kempel, L. C. 2011 IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). p. 2487-2490 4 p. 5997028

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Finite element method
Galerkin methods
Electromagnetic fields
Polynomials
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: Contribution to journalArticle

Nanoparticles
Myosins
Iron
Silica
Composite materials
4 Citations

Design study of electronically steerable half-width microstrip leaky wave antennas

Hejase, J. A., Myers, J., Kempel, L. & Chahal, P. 2011 Proceedings - Electronic Components and Technology Conference. p. 1348-1353 6 p. 5898687

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Antennas
Scanning
Buccal Administration
Acetylcholine
Imidocarb
1 Citations

Development of time domain vector generalized finite element method

Tuncer, O., Shanker, B. & Kempel, L. C. 2011 IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). p. 2980-2982 3 p. 5997155

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Finite element method
Physics
Polynomials
Boundary conditions

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

antennas
curvature
Antennas
cavities
patch antennas
2 Citations

Generalized method of moments: A flexible discretization scheme for integral equations using locally smooth surface approximations

Nair, N. V., Shanker, B. & Kempel, L. 2011 2011 IEEE International Conference on Microwaves, Communications, Antennas and Electronic Systems, COMCAS 2011. 6105955

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Method of moments
Integral equations
Scattering
43 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

Composite materials
Methacholine Compounds
Permittivity
Fillers
Nanoribbons

Theoretical analysis of a varactor-loaded half-width leaky-wave antenna

Kempel, L., Rothwell, E., Shanker, B. & Chahal, P. 2011 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011. 6050351

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Antennas
Varactors
Fires
Antenna phased arrays
Bandwidth

Vector generalized finite element method on tetrahedral meshes and applications of its features in electromagnetic simulations

Tuncer, O., Sahin, F. O., Shanker, B. & Kempel, L. C. 2011 IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). p. 2465-2467 3 p. 5997022

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Finite element method
Polynomials
Demonstrations
Physics
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 integrals
Convolution
expansion
evaluation
costs

A generalized basis function framework for integral and differential equations in electromagnetics

Tuncer, O., Nair, N. V., Shanker, B. & Kempel, L. C. 2010 2010 Loughborough Antennas and Propagation Conference, LAPC 2010. p. 9-12 4 p. 5666813

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Integral equations
Differential equations
5 Citations

A hybrid finite element- Vector generalized finite element method for electromagnetics

Tuncer, O., Shanker, B. & Kempel, L. C. 2010 2010 IEEE International Symposium on Antennas and Propagation and CNC-USNC/URSI Radio Science Meeting - Leading the Wave, AP-S/URSI 2010. 5561926

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Finite element method
Brick
30 Citations

An ultrawideband (UWB) switched-antenna-array radar imaging system

Charvat, G. L., Kempel, L. C., Rothwell, E. J., Coleman, C. M. & Mokole, E. L. 2010 IEEE International Symposium on Phased Array Systems and Technology. p. 543-550 8 p. 5613313

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Radar systems
Ultra-wideband (UWB)
Radar
Antennas
Imaging techniques
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: Contribution to journalArticle

Radar imaging
Imaging techniques
Air
slabs
Continuous wave 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: Contribution to journalArticle

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: Contribution to journalArticle

radar
Radar
pulses
Radar imaging
Radar systems
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 equations
flexibility
inhomogeneity
19 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
polymers
Nanocomposites
Polymers
Laryngeal Mucosa

VGFEM with perfectly matched layers

Tuncer, O., Shanker, B. & Kempel, L. C. 2010 2010 IEEE International Symposium on Antennas and Propagation and CNC-USNC/URSI Radio Science Meeting - Leading the Wave, AP-S/URSI 2010. 5561882

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Anisotropic media
Polynomials
2009

A trough leaky-wave antenna

Jaramillo-Henao, C. A., Kempel, L. C. & Schneider, S. 2009 IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). 5171768

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Antennas
4 Citations

A vector generalized finite element-boundary integral formulation for scattering from cavity-backed apertures

Tuncer, O., Shanker, B. & Kempel, L. C. 2009 IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). 5171717

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Scattering
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

finite element method
antennas
propagation
Microstrip lines
Antennas
4 Citations
Anthralin
Aldrin
Abdominal Injuries
Kinetics
curing
1 Citations

Development of vector basis functions in vector generalized finite element method for inhomogeneous domains

Tuncer, O., Shanker, B. & Kempel, L. C. 2009 IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). 5171545

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Finite element method

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

curing
temperature
Curing
Temperature
Acetanilides
3 Citations

Finite element analysis of conformal antennas

Gardner, C., Jarmillo-Heano, C. & Kempel, L. C. 2009 Proceedings of the 2009 International Conference on Electromagnetics in Advanced Applications, ICEAA '09. p. 844-847 4 p. 5297346

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Antennas
Bandwidth
Structural loads
Radiators
Microstrip antennas