The following papers have been published by DEI employees.

For more information, please contact: contact@directedenergyky.com.

Plasma Microwave Components

L. W. Cross, "Study of X-Band Plasma Devices for Shielding Applications", in IEEE Int. Microw. Symp., Tampa, FL, Jun. 2014.
L. W. Cross and M. J. Almalkawi, “Scan Angle Stability of a Second-Order Plasma-Switched Frequency Selective Surface”, in COMSOL Conf., Boston, MA, Oct. 2013.
L. W. Cross, M. J. Almalkawi, and V. K. Devabhaktuni, “Development of Large-Area Switchable Plasma Device for X-Band Applications”, IEEE Trans. on Plasma Sci., vol. 41, no. 4, pp. 948–954, Apr. 2013.
L. W. Cross, M. J. Almalkawi, and V. K. Devabhaktuni, “Theory and Demonstration of Narrowband Bent Hairpin Filters Integrated with AC-Coupled Plasma Limiter Elements”, IEEE Trans. on Electromagn. Compat., vol. 55, no. 6, pp. 1100–1106, Mar. 2013.

Antennas

M. J. Almalkawi, L. W. Cross, and K. A. Alshamaileh, “A Transmission Line Circuit-Oriented Approach for Miniaturization of a Log-Periodic Dipole Array (LPDA) Antenna”, in IEEE 57th Int. Midwest Symp. on Circuits and Syst., College Station, TX, Aug. 2014, pp. 73–76.
M. Westrick, M. J. Almalkawi, V. K. Devabhaktuni, and C. Bunting, “A Low-Profile, Low-Cost Antenna System with Improved Gain for DSRC Vehicle-to-Vehicle Communications”, Int. J. of RF and Microw. Comput.-Aid. Eng., vol. 23, no. 1, pp. 111–117, Jan. 2013.
M. J. Almalkawi, M. Westrick, and V. K. Devabhaktuni, “Compact Super Wideband Monopole Antenna with Switchable Dual Band-Notched Characteristics”, in Asian-Pacific Microw. Conf., Kaohsiung, Taiwan, Dec. 2012, pp. 723–725.
M. J. Almalkawi and V. K. Devabhaktuni, “Quad Band-Notched UWB Antenna Compatible with WiMAX/INSAT/Lower-Upper WLAN Applications”, IET Electron. Lett., vol. 47, no. 19, pp. 1062–1063, Sep. 2011.

Microwave Components

A. Sahu, M. J. Almalkawi, and V. K. Devabhaktuni, “SIW Diplexer Loaded with Complementary Stepped Impedance S-Shaped Resonators”, Progress in Electromagn. Research Lett., vol. 48, pp. 117–121, Aug. 2014.
A. Sahu, B. R. Grayczyk, M. J. Almalkawi, V. K. Devabhaktuni, and P. H. Aaen, “High-Q Spiral Inductors with Multilayered Split Ring Resonator (SRR) Patterned Ground Shields”, in IEEE Int. Symp. on Antennas and Propag., Memphis, TN, Jul. 2014, pp. 346–347.
A. Madanayake, N. Udayanga, C. Wijenayake, M. J. Almalkawi, and V. K. Devabhaktuni, “Directional Cyclostationary Feature Detectors using 2-D IIR RF Spiral-Antenna Beam Digital Filters”, in IEEE Int. Symp. on Circuits and Syst., Melbourne, Australia, Jun. 2014, pp. 2499–2502.
K. A. Alshamaileh, M. J. Almalkawi, V. K. Devabhaktuni, N. I. Dib, and S. Abushamleh, “Realization of Multi-Band 3-dB Branch-Line Couplers using Fourier-Based Transmission Line Profiles”, Electromagn., vol. 34, no. 2, pp. 128–140, Jan. 2014.
M. J. Almalkawi, K. A. Alshamaileh, and S. Abushamleh, “Non-Uniform PCB Traces with Prescribed Frequency Bands for Improved Crosstalk Immunity", J. of Electromagn. Waves Appl., vol. 28, no. 3, pp. 295–305, Dec. 2013.
K. A. Alshamaileh, M. J. Almalkawi, V. K. Devabhaktuni, N. I. Dib, B. H. Henin, and A. M. Abbosh, “Non-uniform Transmission Line Ultra-Wideband Wilkinson Power Divider”, Progress in Electromagn. Research C, vol. 44, pp. 1–11, Sep. 2013.
A. Madanayake, R. M. Joshi, C. Wijenayake, M. J. Almalkawi, L. Belostotski, L. T. Bruton, and V. K. Devabhaktuni, “Electronically Scanned RF-to-Bits Beam Aperture Arrays using 2-D IIR Spatially Bandpass Digital Filters”, Elsevier - Multidimensional Syst. and Signal Process., pp. 1–23, Sep. 2013.
L. W. Cross, M. J. Almalkawi, V. K. Devabhaktuni, “Half Mode Substrate Integrated Waveguide (HMSIW) Loaded Evanescent-Mode Bandpass Filter”, Int. J. RF Microw. Comput.-Aid. Eng., vol. 23, no. 2, pp. 172–177, Mar. 2013.
K. A. Alshamaileh, M. J. Almalkawi, V. K. Devabhaktuni, and N. I. Dib, “Compact Tunable 3 dB Hybrid and Rat-Race Couplers with Harmonics Suppression”, Int. J. of Microw. and Opt. Technol., vol. 7, no. 6, pp. 372-379, Nov. 2012.
M. J. Almalkawi and V. K. Devabhaktuni, “Compact Realization of Combline Bandpass Filter Integrated with Defected Microstrip Structure Bandstop Filter”, Progress in Electromag. Research Lett., vol. 35, pp. 99–105, Oct. 2012.
M. J. Almalkawi, C. Bunting, V. K. Devabhaktuni, and A. Sebak, “Waveguide Tubes Coated with Inhomogeneous Lossy Materials for Superior Shielding Above and Below Cutoff Frequency”, IEEE Magn. Lett., vol. 3, no. 0500304, Jul. 2012.
N. Arbabi, M. J. Almalkawi, V. K. Devabhaktuni, M. Yagoub, and A. Madanayake, “A Compact Realization of Composite Lowpass Filter for Monolithic Microwave Integrated Circuit (MMIC) Applications”, Int. J. of RF and Microw. Comput.-Aid. Eng., vol. 22, no. 2, pp. 147–152, Mar. 2012.
M. J. Almalkawi, M. Westrick, V. K. Devabhaktuni, M. Alam, L. Zhu, and J. Deng, “Design of a Dual-Band Dual-Mode Substrate Integrated Waveguide Filter with Symmetric Transmission Zeros”, IEEE Applied Electromagn. Conf., Kolkata, India, Dec. 2011, pp. 1–3.
M. J. Almalkawi, L. Zhu, and V. K. Devabhaktuni, “Dual-Mode Substrate Integrated Waveguide (SIW) Bandpass Filters with an Improved Upper Stopband Performance”, in 36th Int. Conf. on Infrared, Millimeter, and THz Waves, Houston, TX, Oct. 2011, pp. 1–2.
M. J. Almalkawi, L. Zhu, and V. K. Devabhaktuni, “Magnetically Tunable Substrate Integrated Waveguide Bandpass Filters Employing Ferrites”, in 36th Int. Conf. on Infrared, Millimeter, and THz Waves, Houston, TX, Oct. 2011, pp. 1–2.
M. J. Almalkawi and V. K. Devabhaktuni, “Far-End Crosstalk Reduction in PCB Interconnects Employing Stepped Impedance Elements and Open-Circuited Stubs”, Int. J. of RF and Microw. Comput.-Aid. Eng., vol. 21, no. 5, pp. 596–601, Sep. 2011.
W. M. Fathelbab and M. J. Almalkawi, “Realization of Dual-Band Filter Characteristics by Box Configurations”, Progress in Electromagn. Research Lett., vol. 22, pp. 175–180, Mar. 2011.
W. M. Fathelbab and M. J. Almalkawi, “Narrowband Filters with Tightly Coupled Resonators”, IET Microw., Antennas & Propag., vol. 4, no. 2, pp. 269–276, Feb. 2010.
M. J. Almalkawi and W. M. Fathelbab, “Novel Implementations of Dual- and Triple-Band Filters on Double Sided-Substrates”, in IEEE Radio and Wireless Symp., San Diego, CA, Jan. 2009, pp. 79–82.

RF/Microwave ANN Modeling

S. Adusumilli, M. J. Almalkawi, and V. K. Devabhaktuni, “A Robust Correction Model Based Neural Network Modeling Framework for Electromagnetic Simulations and RF Measurements”, in 82nd ARFTG Microw. Meas. Conf., Columbus, OH, Nov. 2013, pp. 1–6.
L. Mareddy, M. J. Almalkawi, S. Vemuru, M. Bakr, and V. K. Devabhaktuni, “Trust Region Based Optimization of PKI Neural Models for RF/Microwave Devices”, Int. J. of RF and Microw. Comput.-Aid. Eng., vol. 23, no. 5, pp. 559–569, Sep. 2013.
L. Mareddy, M. J. Almalkawi, V. K. Devabhaktuni, S. Vemuru, L. Zhang, and P. H. Aaen, “Gradient Based Reverse ANN Modeling Approach for RF/Microwave Computer Aided Design”, in The European Microw. Integr. Circuits Conf., Amsterdam, Netherland, Oct. 2012, pp. 246–249.