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Konstantinos Zekios

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Konstantinos Zekios
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Journals

2025
  • O. Anastasiadis, C. L. Zekios, S. B. Venkatakrishnan and J. L. Volakis, “A Comprehensive Review On Tightly Coupled Dipole Arrays,” in IEEE Transactions on Antennas and Propagation, doi: 10.1109/TAP.2025.3588742.
  • Arnaoutoglou, Dimitrios G., Tzichat M. Empliouk, Theodoros N. F. Kaifas, Constantinos L. Zekios, and George A. Kyriacou. 2025. “Perspectives and Research Challenges in Wireless Communications Hardware for the Future Internet and Its Applications Services” Future Internet 17, no. 6: 249. https://doi.org/10.3390/fi17060249
  • Zhao, Y.; Venkatakrishnan, S.B.; Zekios, C.L.; Mandal, S.; Madanayake, A. Multi-Beam STAR MIMO Using Differential Arrays. Information 2025, 16, 321. https://doi.org/10.3390/info16040321
  • Exadaktylos, A. G. Koutinos, C. L. Zekios and S. V. Georgakopoulos, “A Design Method to Increase the Bandwidth of Reflectarray Antennas,” in IEEE Open Journal of Antennas and Propagation, vol. 6, no. 2, pp. 497-512, April 2025, doi: 10.1109/OJAP.2025.3530251.
  • Sendrea, R.E.; Zekios, C.L.; Georgakopoulos, S.V. “A Review of Multi-Fidelity Learning Approaches for Electromagnetic Problems” Electronics 2025, 14, 89. https://doi.org/10.3390/electronics14010089
  • M. Hamza, C. Exadaktylos, C. L. Zekios and S. V. Georgakopoulos, “An Ultra-Wideband Fully-Planar Inverted-L Element (FILE) Array,” in IEEE Transactions on Antennas and Propagation, doi: 10.1109/TAP.2024.3502900.
  • A. G. Koutinos, C. L. Zekios and S. V. Georgakopoulos, “Reexamining the Impedance Matching Equation of Alfred Lopez: A new light and new understanding,” in IEEE Antennas and Propagation Magazine, doi: 10.1109/MAP.2024.3457308.
2024
  • MD Khan, C. L. Zekios, Sh. Bhardwaj, and S. V. Georgakopoulos, “A Physics-Informed Neural Network-Based Waveguide Eigenanalysis”. in IEEE Access, vol. 12, pp. 120777-120787, 2024, doi: 10.1109/ACCESS.2024.3452160.
  • S.Yao, C. L. Zekios, and S. V. Georgakopoulos, “A Rigidly Foldable and Reconfigurable Thick Origami Antenna”. Phil. Trans. R. Soc. A ;382: 20240002. https://doi.org/10.1098/rsta.2024.0002.
  • D. I. Lialios, C. L. Zekios and S. V. Georgakopoulos, “Non-Orthogonal Multibeam Network Synthesis Achieving Stein’s Limit and Implementation Based on RGW Technology,” in IEEE Transactions on Antennas and Propagation, vol. 72, no. 11, pp. 8184-8198, Nov. 2024, doi: 10.1109/TAP.2024.3441758.
  • D. I. Lialios, C. L. Zekios and S. V. Georgakopoulos, “Non-Orthogonal Multibeam Network Synthesis Achieving Stein’s Limit and Implementation Based on RGW Technology,” in IEEE Transactions on Antennas and Propagation
  • D. I. Lialios, C. L. Zekios and S. V. Georgakopoulos, “A New Class of Full-Dimensional Planar True-Time-Delay Beamforming Networks,” in IEEE Transactions on Antennas and Propagation, doi: 10.1109/TAP.2024.3352832
  • M. R. Khan, C. L. Zekios, S. Bhardwaj and S. V. Georgakopoulos, “A Deep Learning Convolutional Neural Network for Antenna Near-Field Prediction and Surrogate Modeling,” in IEEE Access, doi: 10.1109/ACCESS.2024.3377219
  • Empliouk T, Kapetanidis P, Arnaoutoglou D, Kolitsidas C, Lialios D, Koutinos A, Kaifas TNF, Georgakopoulos SV, Zekios CL, Kyriacou GA. Compact, Ultra-Wideband Butler Matrix Beamformers for the Advanced 5G Band FR3—Part I. Electronics. 2024; 13(14):2763. https://doi.org/10.3390/electronics13142763.
  • Mishra, A.K., Russo, N.E., An, H.S., Zekios, C.L., Georgakopoulos, S.V. and Shepherd, R.F. (2024), Robotic Antennas Using Liquid Metal Origami. Adv. Intell. Syst. 2400190. https://doi.org/10.1002/aisy.202400190.
  • G. Koutinos, C. L. Zekios, S. V. Georgakopoulos and G. A. Kyriacou, “Increasing the Bandwidth of Antennas Based on the Frequency Pulling Technique: Theoretical Limitations and Practical Considerations,” in IEEE Transactions on Antennas and Propagation, vol. 72, no. 5, pp. 4064-4076, May 2024, doi: 10.1109/TAP.2024.3384771.
2022-2023
  • A. G. Koutinos, C. L. Zekios and S. V. Georgakopoulos, “Increasing the Bandwidth of Wideband Antennas Using the Frequency Pulling Technique,” in IEEE Open Journal of Antennas and Propagation, vol. 4, pp. 1095-1102, 2023, doi: 10.1109/OJAP.2023.3329762
  • Russo, N.E.; Zekios, C.L.; Georgakopoulos, S.V. A CMA-Based Electronically Reconfigurable Dual-Mode and Dual-Band Antenna. Electronics 2023, 12, 3915. https://doi.org/10.3390/electronics12183915.
  • Biswas, A., Zekios, C.L. & Georgakopoulos, S.V. An ultra-fast method for designing holographic phase shifting surfaces. Sci Rep 13, 16511 (2023). https://doi.org/10.1038/s41598-023-43815-2.
  • R. E. Sendrea, C. L. Zekios and S. V. Georgakopoulos, “Multi-Fidelity Surrogate Modeling Based On Analytical Eigenfunction Expansions,” in IEEE Transactions on Antennas and Propagation, vol. 71, no. 2, pp. 1673-1683, Feb. 2023, doi: 10.1109/TAP.2022.3228615.
  • G. P. Carrara, C. L. Zekios and S. V. Georgakopoulos, “A TM11 High-Order Mode Leaky Wave Antenna,” in IEEE Transactions on Antennas and Propagation, vol. 71, no. 1, pp. 119-130, Jan. 2023, doi: 10.1109/TAP.2022.3217257.
2021 - 2022
  • Muhammad Hamza, Constantinos L. Zekios, and Stavros V. Georgakopoulos, “A Low Profile Planar Dual-Polarized Tightly Coupled Dipole Reflectarray With 5:1 Bandwidth,” in IEEE Open Journal of Antennas and Propagation, vol. 3, pp. 958-969, 2022, doi: 1109/OJAP.2022.3198468.
  • Biswas, A., Zekios, C.L., Ynchausti, C. et al. An ultra-wideband origami microwave absorber. Sci Rep 12, 13449 (2022). https://doi.org/10.1038/s41598-022-17648-4
  • M. R. Khan, C. L. Zekios, S. Bhardwaj and S. V. Georgakopoulos, “Multiobjective Fitness Functions With Nonlinear Switching for Antenna Optimizations,” in IEEE Open Journal of Antennas and Propagation, vol. 3, pp. 613-626, 2022, doi: 10.1109/OJAP.2022.3178840.
  • N. E. Russo, C. L. Zekios, and S. V. Georgakopoulos, “MIMO Systems in SmallSat Swarms: System Characterization with the Introduction of a Channel Model,” in IEEE Transactions on Antennas and Propagation, vol. 70, no. 9, pp. 8276-8290, Sept. 2022, doi: 10.1109/TAP.2022.3161310.
  • Paschaloudis, Konstantinos D., Constantinos L. Zekios, Stavros V. Georgakopoulos, and George A. Kyriacou, “A Finite Element Based Characteristic Mode Analysis”, in IEEE Open Journal of Antennas and Propagation, vol. 3, pp. 287-303, 2022, doi: 10.1109/OJAP.2022.3150594.
  • Paschaloudis, Konstantinos D., Constantinos L. Zekios, Georgios C. Trichopoulos, Filippos Farmakis, and George A. Kyriacou, 2021. “An Eigenmode Study of Nanoantennas from Terahertz to Optical Frequencies,” Electronics 10, no. 22: 2782. https://doi.org/10.3390/electronics10222782.
  • S. V. Georgakopoulos, C. L., Zekios, et al., “Origami Antennas,” in IEEE Open Journal of Antennas and Propagation, vol. 2, pp. 1020-1043, 2021, doi: 10.1109/OJAP.2021.3121102.
  • M. R. Khan, C. L. Zekios, S. Georgakopoulos and S. Bhardwaj, “Automated Design and Optimization of Origami Electromagnetic Structures [EM Programmer’s Notebook],” in IEEE Antennas and Propagation Magazine, vol. 63, no. 2, pp. 89-102, April 2021, doi: 10.1109/MAP.2021.3053962.
  • N. E. Russo, C. L. Zekios, and S. V. Georgakopoulos, “Decoupling Modes in Multi-Band Microstrip Patch Antennas,” in IEEE Open Journal of Antennas and Propagation, vol. 2, pp. 118-125, 2021, doi: 10.1109/OJAP.2020.3046458.
  • D. I. Lialios, C. L. Zekios, S. V. Georgakopoulos and G. A. Kyriacou, “A Novel RF to Millimeter Waves Frequency Translation Scheme for Ultra-Wideband Beamformers Supporting the Sub-6 GHz Band,” in IEEE Transactions on Antennas and Propagation, vol. 70, no. 12, pp. 11718-11733, Dec. 2022, doi: 10.1109/TAP.2022.3210698.
2019 - 2020
  • Muhammad Hamza, Constantinos L. Zekios, and Stavros V. Georgakopoulos, “A Thick Origami Reconfigurable and Packable Patch Array with Enhanced Beam Steering,” in IEEE Antennas and Propagation, vol. 68, no. 5, pp. 3653-3663, May 2020, doi: 10.1109/TAP.2020.2963922.
  • Kun Bao, Constantinos L. Zekios, and Stavros V. Georgakopoulos, “Miniaturization of SCMR Systems Using Multilayer Resonators,” in IEEE Access, vol. 7, pp. 143445-143453, 2019, doi: 10.1109/ACCESS.2019.2945319.
  • Konstantinos D. Paschaloudis, Constantinos L. Zekios, Laura Ghisa, Peter C. Allilomes, Kyriakos E. Zoiros, Ammar Sharaiha, Stavros Iezekiel, and George A. Kyriacou “An Eigenanalysis Study of Tunable THz and Photonic Unbounded Structures Employing Finite Element Method,” in IEEE Photonics Journal, vol. 11, no. 5, pp. 1-20, Oct. 2019, Art no. 5502920, doi: 10.1109/JPHOT.2019.2935805.
  • K. Bao, C. L. Zekios and S. V. Georgakopoulos, “A Wearable WPT System on Flexible Substrates,” in IEEE Antennas and Wireless Propagation Letters, vol. 18, no. 5, pp. 931-935, May 2019, doi: 10.1109/LAWP.2019.2906069.
  • X. Liu, C. L. Zekios and S. V. Georgakopoulos, “Analysis of a Packable and Tunable Origami Multi-Radii Helical Antenna,” in IEEE Access, vol. 7, pp. 13003-13014, 2019, doi: 10.1109/ACCESS.2019.2892711.
  • Lialios, D.I.; Ntetsikas, N.; Paschaloudis, K.D.; Zekios, C.L.; Georgakopoulos, S.V.; Kyriacou, G.A. Design of True Time Delay Millimeter Wave Beamformers for 5G Multibeam Phased Arrays. Electronics 2020, 9, 1331. doi: 10.3390/electronics9081331
  • Biswas, A., Zekios, C.L. & Georgakopoulos, S.V. Transforming single-band static FSS to dual-band dynamic FSS using origami. Sci Rep 10, 13884 (2020). https://doi.org/10.1038/s41598-020-70434-y.
2014 - 2015
  • Constantinos L. Zekios, Peter C. Allilomes, and George A. Kyriacou, “DC and Imaginary Spurious Modes Suppression for Both Unbounded and Lossy Structures,” in IEEE Transactions on Microwave Theory and Techniques, vol. 63, no. 7, pp. 2082-2093, July 2015, doi: 10.1109/TMTT.2015.2430324.
  • C. L. Zekios, P. C. Allilomes, M. T. Chryssomallis, and G. A. Kyriacou, “Finite element based eigenanalysis for the study of electrically large lossy cavities and reverberation chambers,” Progress In Electromagnetics Research B, Vol. 61, 269-296, 2014, doi:10.2528/PIERB14071804
2012 - 2013
  • G. A. Kyriacou, C. S. Lavranos, P. C. Allilomes, C. L. Zekios, S. J. Lavdas, and A. V. Kudrin. “Eigenanalysis of Open Radiating, Periodic, and Curved Waveguide Structures”, Radio Science Bulletin, ISSN 1024-4530, no. 344, pp. 13-31, 2013, doi: 10.23919/URSIRSB.2013.7909924.
  • C. L. Zekios, P. C. Allilomes, and G. A. Kyriacou, “Eigenanalysis of Electromagnetic Structures Based on the Finite Element Method”, Applied Mathematics, 2013, 4, 1009-1022, doi:10.4236/am.2013.47138 Published Online July 2013
  • C. L. Zekios, P. C. Allilomes, and G. A. Kyriacou, “Evaluation of eigenmode quality factor of large complex cavities based on PEC linear finite element formulation,” Electronics Letters, Volume 48, issue22, 25 October 2012, p. 1399 – 1401, doi: 10.1049/el.2012.1852.