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Dr. Malcolm Ng Mou Kehn
Dr. Malcolm Ng Mou Kehn
Professor
Group:
EM Technology
Office:
ED927
Phone:
(03)5712121ext54546
E-mail:
malcolm.ng@ieee.org
Website:
Research:
Antenna Designs, Electromagnetic Theory
  • Biography
    Malcolm Ng Mou Kehn received the B.Eng. degree from the National University of Singapore, Singapore, in 2001, and the Licentiate and Ph.D. degrees from Chalmers University of Technology, Gothenburg, Sweden, in Feb 2004 and Dec 2005, respectively, all in electrical engineering. During 2006–2008, he was a Postdoctoral Fellow in the Department of Electrical and Computer Engineering at the University of Manitoba, Winnipeg, MB, Canada. Following this, he proceeded to Concordia University, Montreal, QC, Canada, for another year of postdoctoral work. In Aug 2009, he joined the Department of Electrical Engineering at National Chiao Tung University, Hsinchu, Taiwan, first as an Assistant Professor and has since Aug 2012 been an Associate Professor. He has been actively involved in research projects funded by the Swedish Defense Research Agency between 2002 and 2006. During autumn 2004, he spent several months at the University of Siena, Italy, for a research visit. In December 2004, he visited the University of Zagreb, Croatia, as an invited speaker where he gave an IEEE lecture, in connection with the IEEE Croatia Chapter activities. He is a Senior Member of the IEEE. Throughout 2006 to 2009, he worked extensively on numerous projects supported by Canadian industry and national research bodies. Ever since Aug 2009, he has been securing research project grants funded by the National Science Council and Ministry of Science and Technology of Taiwan. He is an Associate Editor of IET Microwaves, Antennas and Propagation. Dr. Ng Mou Kehn received the Union Radio-Scientifique Internationale (URSI) Young Scientist Award in 2007 and the NCTU Meritorious Teaching Award in 2013 and 2014.

    Personal Information:
    o NYCU Academic Hub: https://scholar.nycu.edu.tw/zh/persons/mou-kehn-malcolm-ng
     

  • Experience, Honors and Awards

    Honors:

    • 2014: Excellent Teaching Award - National Chiao Tung University
    • 2013: Excellent Teaching Award - National Chiao Tung University
    • 2007: URSI Young Scientist Award - Union Radio Scientifique Internationale
    • 2007: Marquis Who's Who in Asia
    • 2006: Marquis Who's Who in Science and Engineering

    Experience:

     
    • 2001/6~2006/7 Research Assistant, Electromagnetics/Signals & Systems, Chalmers University of Technology, Sweden
    • 2006/9~2008/9 Postdoctoral Fellow, Electrical and Computer Engineering, University of Manitoba, Canada
    • 2008/9~2009/7 Postdoctoral Fellow, Electrical and Computer Engineering, Concordia University, Canada

  • Research Highlights

    Topic 1:
    Metasurface lenses

    1.png

    Currently, the topic of metamaterials has been extensively researched, showcasing high potential across various fields such as optics, photonics, antennas, sensing, imaging, and spectroscopy. The concept of a hyperlens interface composed of two-dimensional periodic metallic patches has been proposed. Apart from synthesizing properties not readily available in nature, the hyperlens interface, as opposed to traditional lenses, offers cost reduction, space-saving benefits, and lightweight characteristics.
    This paper focuses on applying the Luneburg lens to surface wave antennas. However, in the foundational theoretical analysis, most discussions have overlooked the investigation of the propagation direction of waves concerning the dispersion relationship within periodic structures. Thus, this paper proposes an alternative periodic arrangement for synthesizing Luneburg lenses. Initially, considering the direction of wave propagation in the dispersion relationship analysis. Subsequently, by comparing two periodic arrangements, this theory is validated. Furthermore, leveraging aperture antenna characteristics to define the aperture of this antenna and evaluating its performance through various efficiency calculations for feature quantification purposes. Additionally, a novel synthesis method to enhance the performance of surface wave antennas will be introduced at the end of this paper.

    [1] J. A. Dockrey, M. J. Lockyear, S. J. Berry, S. A. R. Horsley, J. R. Sambles, and A. P.Hibbins, “Thin metamaterial Luneburg lens for surface waves” Electromagnetic andAcoustic Materials Group, Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter EX4 4QL, United Kingdom, March 2013. (Link)
    [2] L. Yin, V. K. Vlasko-Vlasov, J. Pearson, J. M. Hiller, J. Hua, U. Welp, D. E. Brown, and C. W. Kimball, “Subwavelength focusing and guiding of surface plasmons,” Nano. Lett. 5, 1399–1402 (2005). (Link)
    [3] O. Quevedo-Teruel, M. Ebrahimpouri, M. Kehn, “Ultra Wide Band Metasurface Lenses Based on Off-Shifted Opposite Layers,” IEEE Antennas Wireless Propag.Lett., vol. 15, pp. 484-487, 2016. (Link)
    [4] S. Maci, G. Minatti, M. Casaletti, and Marko Bosiljevac, “Metasurfing: Addressing Waves on Impenetrable Metasurfaces,” IEEE antennas and wireless propagation letters, vol. 10, 2011. (Link)
    [5] M. Casaletti, F. Caminita, and S. Maci, “A Luneburg lens designed by using a variable artificial surface,” in Proc. IEEE Antennas Propag. Society Int. Symp. (APSURSI), Jul. 11–17, 2010, pp. 1–4. (Link)
    [6] L. Xue and V. F. Fusco, “Printed holey plate Luneburg lens,” Microw. Opt. Technol. Lett., vol. 50, pp. 378–380, Dec. 2007. (Link)
    ________________________________________

    Topic 2:
    Holographic leaky-wave antennas 

     2.png

    The directional leaky-wave antenna, based on holographic theory, has undergone several years of development. It is designed to radiate a directive beam using the principles of holography. The antenna plane comprises a PCB board integrated with sub-wavelength metallic patches on its surface. Upon feeding a known surface wave, the antenna emits a pencil-shaped beam at the desired angle. Altering the arrangement of surface metallic patches results in variations in the radiation angle of the beam. Leveraging this characteristic, our aim is to further develop beam steering techniques, employing mechanical mechanisms such as rotational structures instead of active circuitry.
    In this paper, the antenna plane is segmented into multiple sections, each possessing its holographic surface. Portions not required for radiation are covered by metallic shielding, allowing only the exposed antenna segments to radiate. By rotating the metallic shielding, we can adjust the radiating segments, thereby altering the radiation angle to achieve beam steering effects.

    [1] D. Sievenpiper, J. Colburn, B. Fong, J. Ottusch, and J. Visher, “Holographic artificial impedance surfaces for conformal antennas,” presented at the IEEE Antennas and Propagation Symposium Digest, Washington DC, Jul. 5, 2005. (Link)
    [2] Dan Sievenpiper, James Schaffner, Robert Loo, Gregory Tangonan, Samuel Ontiveros, and Rick Harold, “A Tunable Impedance Surface Performing as a Reconfigurable Beam Steering Reflector," IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 50, NO. 3, MARCH 2002. (Link)
    [3] An Overview of the Theory and Applications of Metasurfaces: The Two-Dimensional Equivalents of Metamaterials. (Link)
    [4] D. Sievenpiper, L. Zhang, R. Broas, N. Alexopolous, and E. Yablonovitch, “High-impedance electromagnetic surfaces with a
    forbidden frequency band,” IEEE Trans. Microw. Theory Tech., vol. 47, pp. 2059–2074, Nov. 1999. (Link)
    [5] Sivaseetharaman Pandi, “Holographic Metasurface Leaky Wave Antennas”, A Dissertation Presented in Partial Fullment of the Requirements for the Degree Doctor of Philosophy. (Linkhttps://core.ac.uk/download/pdf/97830522.pdf)
    [6] W. Kock, “Microwave holography,” Microwaves, vol. 7, no. 11, pp. 46–54, Nov. 1968. (Link)
    [7] Christian Rusch, “Holographic Antennas”, Handbook of Antenna Technologies, Springer Science + Business Media Singapore 2015. (Link)
    [8] P. Checcacci, V. Russo, and A. Scheggi, “Holographic antennas,” IEEE Trans. Antennas Propag., vol. 18, no. 6, pp. 811–813, Nov. 1970. (Link)
    [9] Bryan H. Fong, Joseph S. Colburn, John J. Ottusch, John L. Visher, and Daniel F. Sievenpiper, “Scalar and Tensor Holographic Artificial Impedance Surfaces," IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 58, NO. 10, OCTOBER 2010. (Link)
    [10] Ming Yao and Jia Lin Li, “Beam reconfigurable holographic artificial impedance surface at terahertz band”, Journal of Physics D: Applied Physics, Published 6 February 2019. (Link)
    [11] S. Ramo, J. R. Whinnery, and T. Van Duzer, Fields and Waves in Communication Electronics, 2nd ed. New York: Wiley, 1984.
    ________________________________________

    Topic 3:
    Analysis of grated/corrugated structures by asymptotic boundary conditions


    3.png

    The classic vector potential analysis method along with Asymptotic Strip Boundary Conditions (ASBC) are applied to handle conductive strip gratings enveloping a core dielectric cylindrical rod. Through periodic texturing of the surface, this structure demonstrates behaviors promoting strong surface field localization and wave propagation as plasma behavior. This allows its use as a cylindrical surface waveguide or antenna. It can also be configured to exhibit Electromagnetic Band Gap (EBG) characteristics, forming what is termed a cylindrical EBG structure.
    In contrast to the typical counterpart with a conductive core rod, the dielectric core is shown to be crucial for achieving a wide total band gap in this study, where neither slow surface waves nor fast spatial waves exist. This stands in contrast to the conductive core rod version, which only provides surface wave band gaps, neglecting suppression of fast spatial waves, as overlooked by many others in the literature.
    By coaxially connecting various such rod structures, each with its unique total band gap, multi-frequency, multi-functional cylindrical antennas are achieved. This mitigates inter-band interference even during concurrent operation when the passband of any rod falls within all other total band gaps, as investigated in this paper. Measurements on manufactured prototypes confirm experimental results align closely with theoretical predictions.

    [1] S. A. Maier, S. R. Andrews, L. Martín-Moreno, and F. J. García-Vidal, ‘‘Terahertz surface plasmon-polariton propagation and focusing on periodically corrugated metal wires,’’ Phys. Rev. Lett., vol. 97, pp. 176805-1–176805-4, Oct. 2006. (Link)
    [2] Y. Chen, Z. Song, Y. Li, M. Hu, Q. Xing, Z. Zhang, L. Chai, and C.-Y. Wang, ‘‘Effective surface plasmon polaritons on the metal wire with arrays of subwavelength grooves,’’ Opt. Exp., vol. 14, no. 26, pp. 13021–13029, Dec. 2006. (Link)
    [3] G. K. Palikaras, A. P. Feresidis, and J. C. Vardaxoglou, ‘‘Cylindrical electromagnetic bandgap structures for directive base station antennas,’’ IEEE Antennas Wireless Propag. Lett., vol. 3, pp. 87–89, 2004. (Link)
    [4] G. K. Palikaras, A. P. Feresidis, and J. C. Vardaxoglou, ‘‘Cylindrical EBG surfaces for omni-directional wireless LAN antennas,’’ in Proc. IEEE Antennas Propag. Soc. Int. Symp., Washington, DC, USA, Jul. 2005, pp. 339–342. (Link)

  • Journals
    ●    Metasurface cloaking lens designed by the ray insertion method, IEEE Antennas and Wireless Propagation Letters, accepted for publication, 2023.
    ●    M. Ng Mou Kehn and C.-Y. Wu, “Analysis by asymptotic boundary conditions of strip-grated dielectric pipe over dielectric rod with wide total band-gap as multi-frequency cylindrical leaky-wave antennas,” IEEE Access, vol. 10, pp. 108651-108667, 2022.
    ●    M. Ng Mou Kehn and J.-H. Liao, "Supplementary material: Multiple stacks of rotated metal strip gratings for high-gain bandwidth enhancement and gain control of overlying dipoles – analysis by asymptotic strips boundary conditions,” IEEE Transactions on Antennas and Propagation, vol. 70, no. 12, Dec. 2022.
    ●    M. Ng Mou Kehn and J. H. Liao, "Multiple stacks of rotated metal strip gratings for high-gain bandwidth enhancement and gain control of overlying dipoles – Analysis by asymptotic strips boundary conditions,” IEEE Transactions on Antennas and Propagation, vol. 70, no. 12, pp. 11867-11880, Dec. 2022.
    ●    M. Ng Mou Kehn and C. Z. Chen, “Analysis of leaky-wave radiation from corrugated parallel-plate waveguides with steerable beams by rotatable corrugations,” IEEE Transactions on Antennas and Propagation, accepted for publication, 2021.
    ●    M. Ng Mou Kehn and W.-Y. Lai, "Modal analysis of gratings with conducting strip-loaded bars and sandwiched between multiple dielectric layers," IEEE Transactions on Antennas and Propagation, vol. 68, no. 6, pp. 5027-5032, June 2020.
    ●    J. Y. Wang, M. Ng Mou Kehn, and E. Rajo-Iglesias, “Design of a planar array of low profile horns at 28 GHz,” Sensors, 20, 6989, pp. 1-15, 2020.
    ●    M. Ng Mou Kehn, “Enhancements of applications entailing higher-order Floquet harmonics of penetrable metallic gratings with bars loaded with conducting fins and stratified dielectric covers on both sides,” Progress in Electromagnetic Research, vol. 88, pp. 19-34, 2020., 2020
    ●    M. Ng Mou Kehn, C. K. Hsieh, and E. Rajo-Iglesias, "Array of horns fed by a transverse slotted groove gap waveguide at 28 GHz," Sensors, 20, 5311, pp. 1-15, 2020.
    ●    M. Ng Mou Kehn, “Moment method treatment of corrugations with fins over ridges and stratified covers using dyadic cavity and multilayer green's functions for studies of higher-order diffraction modes,” Progress in Electromagnetic Research, vol. 88, pp. 1-18, 2020.
    ●    Y.-C. Yang and M. Ng Mou Kehn, "Analysis of strip-grated dielectric-coated rods by asymptotic strip boundary conditions for studies of dielectric losses and field localization," IEEE Transactions on Microwave Theory and Techniques, vol. 67, no. 5, pp. 1740-1752, May 2019.
    ●    W.-Y. Lai and M. Ng Mou Kehn, "Analysis of doubly-stacked rotated gratings using asymptotic corrugations boundary conditions," IEEE Transactions on Antennas and Propagation, vol. 67, no. 7, pp. 4693-4707, Jul. 2019.
    ●    M. Ng Mou Kehn and W.-Y. Lai, "Characterization of extraordinary transmission through conducting screens pierced by arrays of rectangular flared holes for quantitative comparison among various taper profiles and study of metal losses," OSA Continuum, vol. 2, no. 9, pp. 2728-2754, Sep. 2019.
    ●    M. Ng Mou Kehn, "Modal analysis of metallic screen with finite conductivity perforated by an array of subwavelength rectangular flared holes," Opt. Exp., vol. 26, no. 25, pp. 32981-33004, Oct. 2018.
    ●    M. Ng Mou Kehn, “Extraordinary transmission through subwavelength hole arrays for general oblique incidence – mechanism as related to surface wave dispersion and Floquet lattice diagrams,” Progress in Electromagnetic Research, vol. 82, pp. 49-71, 2018., 2018
    ●    H.-C. Chou, N.-L.Tung, and M. Ng Mou Kehn, "The double-focus generalized Luneburg lens design and synthesis using metasurfaces," IEEE Transactions on Antennas and Propagation, vol. 66, no. 9, pp. 4936-4941, Sep. 2018
    ●    J.-Y. Li and M. Ng Mou Kehn, "The 90o rotating Eaton lens synthesized by metasurfaces," IEEE Antennas and Wireless Propagation Letters, vol. 17, no. 7, pp. 1247-1251, May 2018.
    ●    J.-W. Yang, W.-Y. Lai, H.-C. Chou, and M. Ng Mou Kehn, "Compact Mikaelian lens synthesized by metasurfaces," IEEE Antennas and Wireless Propagation Letters, vol. 17, no. 3, pp. 397-400, Mar. 2018.
    ●    M. Ng Mou Kehn and J.-Y. Li, "Modal analysis of corrugated plasmonic rods for the study of field localization, conductor attenuation and dielectric losses," IEEE Transactions on Microwave Theory and Techniques, vol. 66, no. 4, pp. 1684-1700, Apr. 2018.
    ●    M. Ng Mou Kehn, "Corrugated waveguides with stepped ridges and stratified core: reduction of metal and aperture losses and study of thermal and RF breakdown," IEEE Transactions on Microwave Theory and Techniques, vol. 65, no. 5, pp. 1407-1421, May 2017.
    ●    M. Ng Mou Kehn, "Corrugated waveguides with stepped ridges and stratified core for high-power transmission: modal analysis by radial-cavity and concentric multilayer Green's functions," IEEE Transactions on Microwave Theory and Techniques, vol. 64, no. 11, pp. 3409-3428, Nov. 2016.
    ●    O. Quevedo-Teruel, M. Ebrahimpouri, and M. Ng Mou Kehn, "Ultra wide band metasurface lenses based on off-shifted opposite layers," IEEE Antennas & Wireless Propagation Letters, vol. 15, pp. 484-487, Oct. 2015.
    ●    M. Ng Mou Kehn, "Corrugated surfaces with tailorable dark sectors within prescribed frequency bands," IEEE Transactions on Antennas and Propagation, vol. 62, no. 10, pp. 5133-5147, Oct 2014.
    ●    M. Ng Mou Kehn, "Modal analysis of substrate integrated waveguides with rectangular via-holes using cavity and multilayer Green's functions," IEEE Transactions on Microwave Theory and Techniques, vol. 62, no. 10, pp. 2214-2231, Oct 2014.
    ●    M. Ng Mou Kehn, "Modal analysis of all-walls longitudinally corrugated rectangular waveguides using asymptotic corrugations boundary conditions," IEEE Transactions on Microwave Theory and Techniques, vol. 61, no. 11, pp. 3821-3837, Nov 2013.
    ●    S.-Y. Yang and M. Ng Mou Kehn, "A bisected miniaturized ZOR antenna with increased bandwidth and radiation efficiency," IEEE Antennas and Wireless Propagation Letters, vol. 12, pp. 159-162, 2013.
    ●    M. Ng Mou Kehn, "Efficiency enhancement of single off-axis and multiple overlapping beam reflectors using dielectric-covered focal plane array feeds", Radio Science, vol. 48, issue 1, pp. 69-88, Jan/Feb 2013.
    ●    M. Ng Mou Kehn, "Rapid surface-wave dispersion and plane-wave reflection analyses of planar corrugated surfaces by asymptotic corrugations boundary conditions even for oblique azimuth planes," IEEE Transactions on Antennas and Propagation, vol. 61, no. 5, pp. 2695-2707, May 2013.
    ●    E. Pucci, E. Rajo-Iglesias, M. Ng Mou Kehn, and O. Quevedo-Teruel, "Enhancing the efficiency of compact patch antennas composed of split ring resonators by using lumped capacitors," IEEE Antennas and Wireless Propagation Letters, vol. 11, pp. 1362-1365, 2012.
    ●    M. Ng Mou Kehn, “Moment method analysis of plane-wave scattering from planar corrugated surfaces using parallel-plate cavity Green's functions and derivation of analytic reflection-phase formulas for both polarizations and oblique azimuth planes”, Radio Science, vol. 47, RS3008, Jun 2012.
    ●    L. Shafai and M. Ng Mou Kehn, "Spherical slotted antenna coated with double layer of materials having combinations of singly and doubly negative parameters and consequences of mode resonances," Progress in Electromagnetics Research B (PIER B), vol. 45, pp. 223-249, 2012.
    ●    M. Ng Mou Kehn, O. Quevedo-Teruel, and E. Rajo-Iglesias, “Reconfigurable Loaded Planar Inverted F-Antenna Using Varactor Diodes," IEEE Antennas and Wireless Propagation Letters, vol. 10, pp. 466-468, May 2011.
    ●    O. Quevedo-Teruel, M. Ng Mou Kehn, and E. Rajo-Iglesias, “Patch antennas based on short-circuited split ring resonators," IEEE Transactions on Antennas and Propagation, vol. AP-59, no. 8, pp. 2758-2765, Aug 2011.
    ●    M. Ng Mou Kehn and L. Shafai, “Wideband radiation enhancement of waveguide arrays operated as feeds for reflector antennas and phased arrays using matching covers composed of microstrip patch arrays and comparison with conventional dielectric sheath tuners”, Radio Science, vol. 45, RS1006.
    ●    M. V. Ivashina, M. Ng Mou Kehn, P.-S. Kildal, and R. Maaskant, “Reply to comments on ‘Decoupling efficiency of a wideband Vivaldi focal plane array feeding a reflector antenna’,” IEEE Transactions on Antennas and Propagation, vol. AP-58. no. 3, pp. 1016-1017, Mar 2010.
    ●    M. Ng Mou Kehn and L. Shafai, “Proper interpretation of source excitations for resolving ostensible excessive power gains of metamaterial resonances”, IET Electronics Letters, vol. 45, no. 12, pp. 599-601, Jun 2009.
    ●    M. Ng Mou Kehn and L. Shafai, “Improved matching of waveguide focal plane arrays using patch array covers as compared to conventional dielectric sheets," IEEE Transactions on Antennas and Propagation, vol. AP-57, no. 10, pp. 3062-3076, Oct. 2009.
    ●    E. Rajo-Iglesias, O. Quevedo-Teruel, and M. Ng Mou Kehn, “Multi-band SRR loaded rectangular waveguide," IEEE Transactions on Antennas and Propagation, vol. AP-57, no. 5, pp. 1570-1574, May 2009. {Times cited: 3}
    ●    M. V. Ivashina, M. Ng Mou Kehn, P.-S. Kildal, and R. Maaskant, “Decoupling efficiency of a wideband Vivaldi focal plane array feeding a reflector antenna," IEEE Transactions on Antennas and Propagation, vol. AP-57, no. 2, pp. 373-382, Feb 2009. {Times cited: 25}
    ●    M. Ng Mou Kehn and L. Shafai, “Characterization of dense focal plane array feeds for parabolic reflectors in achieving closely-overlapping or widely-separated multiple beams”, Radio Science, vol. 44, RS3014, Jun 2009. (25 pages) {Times cited: 3}
    ●    M. Ng Mou Kehn, M. V. Ivashina, P.-S. Kildal, and R. Maaskant, “Definition of unifying decoupling efficiency of different array antennas – case study of dense focal plane array feed for parabolic reflector”, International Journal of Electronics and Communications, May 2009. {Times cited: 13}
    ●    O. Quevedo-Teruel, E. Rajo-Iglesias, and M. Ng Mou Kehn, “Numerical and experimental studies of split ring resonators loaded on the sidewalls of rectangular waveguides”, IET Microwaves, Antennas & Propagation, vol. 3, no. 8, pp. 1262-1270, 2009. {Times cited: 4}
    ●    M. Ng Mou Kehn, L. Shafai, and S. Noghanian, “Permittivity measurement of disk and annular dielectric samples using coaxial transmission-line fixtures – Part I: Theory and formulation," IEEE Canadian Journal of Electrical and Computer Engineering, vol. 34, no. 1-2, pp. 21-29, Winter/Spring, 2009.
    ●    M. Ng Mou Kehn, L. Shafai, F. Safari, and S. Noghanian, “Permittivity measurement of disk and annular dielectric samples using coaxial transmission-line fixtures – Part II: Simulation of the experimental procedure and accuracy analyses," IEEE Canadian Journal of Electrical and Computer Engineering, vol. 34, no. 1-2, pp. 31-41, Winter/Spring, 2009. {Times cited: 2}
    ●    Foroozesh, M. Ng Mou Kehn, and L. Shafai, “Application of artificial ground planes in dual-band orthogonally-polarized low-profile high-gain planar antenna design”, Progress in Electromagnetics Research (PIER), vol. PIER 84, pp. 407-436, 2008. {Times cited: 8}
    ●    M. Ng Mou Kehn, O. Quevedo-Teruel, and E. Rajo-Iglesias, “Split ring resonator loaded waveguides with multiple stopbands”, IET Electronics Letters, vol. 44, no. 12, pp. 714-716, Jun 2008. {Times cited: 7}
    ●    Foroozesh, L. Shafai, and M. Ng Mou Kehn, “Application of polarization and angular dependent artificial ground planes in compact planar high-gain antenna design”, Radio Science, vol. 43, RS6S03, Nov 2008. {Times cited: 3}
    ●    M. Ng Mou Kehn, M. Nannetti, A. Cucini, S. Maci, and P.-S. Kildal, “Analysis of dispersion in dipole-FSS loaded hard rectangular waveguide,” IEEE Transactions on Antennas and Propagation, vol. AP-54, no. 8, pp. 2275-2282, Aug. 2006. {Times cited: 22}
    ●    M. Ng Mou Kehn and P.-S. Kildal, “Miniaturized rectangular hard waveguides for use in multi-frequency phased arrays," IEEE Transactions on Antennas and Propagation, vol. AP 53, no. 1, pp. 100-109, Jan 2005. {Times cited: 30}
    ●    J. Yang, U. Carlberg, P.-S. Kildal, and M. Ng Mou Kehn, “A fast mode analysis for waveguides of arbitrary cross section with multiple regions by using a spectrum of two-dimensional solutions and asymptotic waveform evaluation," IEEE Transactions on Microwave Theory and Techniques, vol. MTT 52, no. 6, pp. 1615-1621, June 2004. {Times cited: 2}

  • Conference Papers
    ●    C.-K. Hsieh, M. Ng Mou Kehn, and E. Rajo-Iglesias, “Design of a transverse slot array in groove gap waveguide using horns at 28 GHz band,” ” Proc. IEEE Int'l Sympos. Antennas Propag. & N. American Radio Sci. Meeting, Jul. 2019, Atlanta, GA, USA.
    ●    W.-Y. Lai and M. Ng Mou Kehn, “Analysis of rotated corrugated parallel plate waveguide using asymptotic corrugation boundary conditions, ” Proc. IEEE Int'l Sympos. Antennas Propag. & N. American Radio Sci. Meeting, Jul. 2019, Atlanta, GA, USA.
    ●    C.-F. Chin and M. Ng Mou Kehn, "Modal analysis of longitudinal corrugated rods using asymptotic boundary conditions," Proc. International Symposium on Antennas & Propagation (ISAP) 2018, Busan, S. Korea, Oct. 2018.
    ●    J.-W. Yang and M. Ng Mou Kehn, "Analysis of longitudinally corrugated cones using asymptotic corrugation boundary conditions," Proc. Asia Pacific Wireless Communications Symposium (APWCS), Hsinchu, Taiwan, Aug 22-24, 2018.
    ●    H.-C. Chou and M. Ng Mou Kehn, "Compact double-focus generalized Luneburg lens synthesized by metasurfaces," Proc. Asia Pacific Wireless Communications Symposium (APWCS), Hsinchu, Taiwan, Aug 22-24, 2018.
    ●    Y.-C. Yang and M. Ng Mou Kehn, "Analysis of strip-grated conducting rod using asymptotic strip boundary conditions," Proc. IEEE Int'l Sympos. Antennas Propag. & N. American Radio Sci. Meeting, Jul. 2018, Boston, MA, USA.
    ●    E. Rajo-Iglesias and M. Ng Mou Kehn, "Applications of soft and hard surfaces in the era of metamaterials", Proceedings in European Conference on Antennas and Propagation 2017, Paris, France, 19-24 March 2017.
    ●    C.-J. Syue, M. Ng Mou Kehn, and O. Quevedo-Teruel, "Compact Mikaelian lens design using metasurface structure," Proc. International Symposium on Antennas & Propagation (ISAP) 2016, Okinawa, Japan, Oct. 2016.
    ●    C.-W. Pan, M. Ng Mou Kehn, and O. Quevedo-Teruel, "Microwave focusing lenses by synthesized with positive or negative refractive index split-ring resonator materials," Proc. International Workshop on Electromagnetics (iWEM) 2015, Hsinchu, Taiwan, Nov. 2015.
    ●    Z.-L. Chen, M. Ng Mou Kehn, and O. Quevedo-Teruel, "Artificial Maxwell fisheye lens design and synthesis with using metasurface structure," Proc. International Workshop on Electromagnetics (iWEM) 2015, Hsinchu, Taiwan, Nov. 2015.
    ●    K.-H. Hsieh, M, Ng Mou Kehn, and O. Quevedo-Teruel, "The manipulation of surface plasmon polaritons and design of Luneburg lens based on periodic patch arrays," Proc. International Workshop on Electromagnetics (iWEM) 2015, Hsinchu, Taiwan, Nov. 2015.
    ●    O. Quevedo-Teruel, M. Ebrahimpouri, and M. Ng Mou Kehn, "Planar lenses by tailoring holey waveguides," Proc. IEEE Int'l Sympos. Antennas Propag. & N. American Radio Sci. Meeting, Jul. 2015, Vancouver, B. C., Canada, Oct. 2015
    ●    Shevchenko and M. Ng Mou Kehn, "Rapid surface-wave analysis of corrugated rods using asymptotic corrugations boundary conditions," Proc. IEEE Antennas Propag. Symp., 2015, Vancouver, B. C., Canada, Jul. 2015.
    ●    Y. Liang and M. Ng Mou Kehn, "Analysis of strip grating structure with ASBC,"  Proceedings of International Symposium on Antennas and Propagation (ISAP) 2014, Kaohsiung, Taiwan, Dec 2014.
    ●    N. Yeh and M. Ng Mou Kehn, "Analysis of substrate integrated waveguides by transverse resonant technique," Proceedings of International Symposium on Antennas and Propagation (ISAP) 2014, Kaohsiung, Taiwan, Dec 2014.
    ●    W. Chao and M. Ng Mou Kehn, "An approximate method of obtaining surface-wave band gap from reflection phase plots for mushroom structures," Proceedings of International Symposium of Antennas and Propagation (ISAP) 2014, Kaohsiung, Taiwan, Dec 2014.
    ●    N. K. Yeh and M. Ng Mou Kehn, "Analysis of substrate integrated waveguides by asymptotic strips boundary conditions; Proceedings in IEEE AP-S Int. Symp., Memphis TN, USA, Jul. 2014.
    ●    M. Ng Mou Kehn, "Sectoral Band-Gap of Planar Corrugated Surfaces by Asymptotic Corrugations Boundary Conditions", Proceedings in IEEE AP-S Int. Symp. 2013, Orlando, FL, USA, Jul. 2013.
    ●    T.-L. Yen and M. Ng Mou Kehn, “Analysis of Surface-Wave Dispersion Properties of Infinite Planar Corrugated Surfaces Using Asymptotic Corrugations Boundary Conditions”, Proceedings in Asia-Pacific Microwave Conference (APMC) 2012, Dec 2012.
    ●    C.-J. Huang and M. Ng Mou Kehn, “Improved characterization of high impedance surfaces for better designs of low profile antennas”, Proceedings in Asia-Pacific Microwave Conference (APMC) 2012, Dec 2012.
    ●    Y.-C. Chiou and M. Ng Mou Kehn, “Modal analysis of a periodic array of metallic pins embedded within a grounded dielectric substrate entailing an asymptotic approach with vanishing unit-cell size”, Proceedings in Asia-Pacific Microwave Conference (APMC) 2012
    ●    P.-C. Tsai and M. Ng Mou Kehn, "Compact Electromagnetic Bandgap Surfaces with Lumped Elements", Proceedings in Asia-Pacific Microwave Conference (APMC) 2012, Dec 2012.
    ●    S.-Y. Yang, M. Ng Mou Kehn, O. Quevedo-Teruel, and E. Rajo-Iglesias, “A compact antenna based on SRR and spiral with increased bandwidth and radiation efficiency”, Proceedings in IEEE AP-S Int. Symp. 2011, Spokane, USA, Jul. 2011.
    ●    T.-L. Yen, M. Ng Mou Kehn, O. Quevedo-Teruel, and E. Rajo-Iglesias, “A new discovery for increasing the total efficiency of a multiband microstrip antenna using a modified split ring resonator with a configurable mechanism”, Proceedings in IEEE AP-S Int. Symp. 2011
    ●    C.-J. Sanchez-Fernandez, O. Quevedo-Teruel, M. Ng Mou Kehn, and E. Rajo-Iglesia;Reconfigurable multilayer patch antennas based on metamaterials, Proceedings in European Conference on Antennas and Propagation 2010, 12-16 April 2010, Barcelona., 2010
    ●    P.-S. Kildal and M. Ng Mou Kehn ;The ridge gap waveguide as a wideband rectangular hard waveguide;, Proceedings in European Conference on Antennas and Propagation 2010, 12-16 April 2010, Barcelona., 2010
    ●    O. Quevedo-Teruel, M. Ng Mou Kehn, and E. Rajo-Iglesias ;Compact SRR-shaped dual band patch antenna, International Review of Progress in Applied Computational Electromagnetics ACES Symposium 2010, April 25–29, Tampere, Finland., 2010
    ●    M. Ng Mou Kehn, M. Ivashina, and L. Shafai ;Performance of multi-beam reflectors fed by phased array feeds with impedance-matching layers;, Proceedings in IEEE AP-S Int. Symp. 2010, Toronto, ON, Canada, Jul. 2010.
    ●    O. Quevedo-Teruel, M. Ng Mou Kehn, E. Pucci, and E. Rajo-Iglesias;On the increase of the efficiency and bandwidth of compact PIFAs based on SRR by making use of lumped capacitors”, Proceedings in IEEE AP-S Int. Symp. 2010 Toronto, ON, Canada, Jul. 2010.
    ●    C.-J. Sanchez-Fernandez, O. Quevedo-Teruel, J. Requena-Carrion, L. I.-Sanchez, M. Ng Mou Kehn, and E. Rajo-Iglesias, “Reconfigurable multilayer patch antennas based on metamaterials”, Proceedings in European Conference on Antennas and Propagation 2010, 12-16 April 2010, Barcelona.
    ●    L. Shafai and M. Ng Mou Kehn;Source Excitation Effects on Power Radiation from Material and Metamaterial Resonances, Proceedings in International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM), 15-18 Feb 2009.
    ●    M. Ng Mou Kehn, A. Foroozesh, and L. Shafai;Parametric Study of EBG Bandwidth for Grounded Square Patch Arrays By Dispersion Analysis, Proceedings in 13th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM), 15-18 Feb 2009.
    ●    L. Shafai, M. Ng Mou Kehn, and A. Foroozesh;Relationship between the source excitation, electromagnetic field solutions and the resonance of modes in material structures; IEEE AP-S Int. Symp. 2009, Charleston, SC, Jun 2009.
    ●    O. Quevedo-Teruel, M. Ng Mou Kehn, L., and E. Rajo-Iglesias,;Optimization Considerations for the Design of Periodic Structures and Metamaterials, Third Young Scientist Meeting on Metamaterials YSMM, 2009, Aula de Grados, Escuela Politecnica Superior, Universidad Carlos III de Madrid, Leganes (Madrid), Spain.
    ●    M. Ng Mou Kehn, E. Rajo-Iglesias, and O. Quevedo-Teruel;Waveguide filters with multiple passbands and stopbands achieved by bed of nails implanted within sidewall dielectric loadings;, Proceedings in International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM), 5-9 Jul 2009, Ottawa, ON, Canada.
    ●    M. Ng Mou Kehn, L. Shafai, F. Safari, and S. Noghanian, Permittivity measurement of annular dielectric samples using a quadratic curve fitting technique, Proc. IEEE AP-S Int. Symp. 2008, San Diego, CA, Jul. 2008.
    ●    M. Ng Mou Kehn, A. Foroozesh, and L. Shafai,Parametric studies of high impedance AMC surfaces realized by periodic array of arbitrarily shaped metallizations printed over grounded dielectric substrates, IEEE AP-S Int. Symp. 2008, San Diego, CA, Jul. 2008.
    ●    M. Ng Mou Kehn and L. Shafai,Investigation of dielectric sheath and periodic microstrip patch arrays as matching layers over waveguide arrays, IEEE AP-S Int. Symp. 2008, San Diego, CA, Jul. 2008.
    ●    M. Ng Mou Kehn, L. Shafai, and P.-S. Kildal,Parametric characterization of parabolic reflector antennas fed by focal plane arrays, submitted to IEEE AP-S Int. Symp. 2008, San Diego, CA, Jul. 2008.
    ●    M. Ng Mou Kehn and L. Shafai, Off-axis beam efficiencies of parabolic reflectors fed by focal plane arrays comprising hard rectangular waveguides, Proc. URSI General Assembly, 2008, Chicago, IL, Aug. 2008.
    ●    L. Shafai and M. Ng Mou Kehn, “Anomalous power radiation from material and metamaterial resonances, Proceedings of International Symposium on Antennas and Propagation, 2008, Taipei, Taiwan, 27-30 Oct 2008.
    ●    M. Ng Mou Kehn and E. Rajo-Iglesias, Moment method analysis of dispersion in SRR-type FSS loaded rectangular waveguides using spectral domain Green functions and RWG basis functions Proc. IEEE AP-S Int. Symp. 2007, pp. 165-168, Honolulu, Hawaii, USA, Jun. 2007.
    ●    M. Ng Mou Kehn, E. Rajo-Iglesias, and O. Quevedo-Teruel, Parametric study of dispersion and filtering capabilities of SRR-type FSS loaded rectangular waveguides, Proc. IEEE AP-S Int. Symp. 2007, pp. 2365-2368, Honolulu, Hawaii, USA, Jun. 2007.
    ●    M. Ng Mou Kehn, L. Shafai, and S. Noghanian, Accuracy improvement of a permittivity measurement technique for cylindrical dielectric samples, Proc. International Symposium on Electromagnetic Theory (EMTS) 2007, Ottawa, ON, Canada, Jul. 2007.
    ●    M. V. Ivashina, M. Ng Mou Kehn, P.-S. Kildal, R. Maaskant, and M. Franzen,Radiation efficiency as a fundamental limitation of wideband dense arrays for multi-beam applications, ESA Antenna Workshop on Multiple Beams and Reconfigurable Antennas, ESTEC, Noordwijk, The Netherlands, 18-20 Apr. 2007
    ●    E. Rajo-Iglesias, M. Ng Mou Kehn, and O. Quevedo-Teruel, Investigation of SRR-type FSS loaded rectangular waveguides with narrow backward traveling modal passband for use as waveguide filters, Proc. URSI-CNC/USNC National Radio Science Meeting, Ottawa, ON, Canada, Jul. 2007.
    ●    M. V. Ivashina, M. Ng Mou Kehn, P.-S. Kildal, and R. Maaskant, On the limitation of dense focal plane array feeds for multi-beam reflector antennas characterized by the radiation efficiency, Proc. URSI-CNC/USNC National Radio Science Meeting, Ottawa, ON, Canada, Jul. 2007.
    ●    Foroozesh, M. Ng Mou Kehn, and L. Shafai, Investigation of the soft/hard surface ground plane effects on far-field radiation properties of high-gain planar antennas with Hertzian dipole excitation, Proc. URSI-CNC/USNC National Radio Science Meeting, Ottawa, ON, Canada, Jul. 2007.
    ●    M. V. Ivashina, M. Ng Mou Kehn, and P.-S. Kildal, Optimal number of elements and element spacing of wide-band focal plane arrays for a new generation radio telescope, Proceedings of European Conference on Antennas and Propagation (EuCAP), 2007, Edinburgh, UK, Nov. 2007.
    ●    E. Rajo-Iglesias, O. Quevedo-Teruel, and M. Ng Mou Kehn, Optimized design of a miniaturized waveguide with SRR-loaded lateral walls, Proceedings of European Conference on Antennas and Propagation (EuCAP), Edinburgh, UK, Nov. 2007.
    ●    M. Ng Mou Kehn and P.-S. Kildal, Fundamental limitations of focal plane arrays characterized in terms of radiation efficiencies of their embedded element patterns IEEE AP-S Int. Symp. 2006, pp. 4319-4322, Albuquerque, NM, USA, Jul. 2006.
    ●    M. V. Ivashina, M. Ng Mou Kehn, P.-S. Kildal, and R. Maaskant,;Control of reflection and mutual coupling losses in maximizing efficiency of dense focal plane arrays, Proc. European Conference on Antennas and Propagation (EuCAP), Nice, France, Nov. 2006.
    ●    M. Ng Mou Kehn, M. Nannetti, S. Maci, and P.-S. Kildal, “Moment method computation of miniaturized rectangular hard waveguide with passband and stopband”, Proc. IEEE AP-S Int. Symp. 2005, vol. 2B, pp. 630-633, Washington DC, USA, Jul. 2005.
    ●    M. Ng Mou Kehn, S. Hrabar, S. Skokic, M. Nannetti, S. Maci, and P.-S. Kildal,;Transverse strip arrays used as hard surfaces and AMCs in miniaturized quasi-TEM waveguides, EPFL LATSIS Symposium, Switzerland, 2005.
    ●    M. Ng Mou Kehn and P.-S. Kildal, Miniaturized hard waveguides for use in multi-frequency arrays ESA Antenna Technology Workshop on Innovative Periodic Antennas: Electromagnetic Bandgap, Left-Handed Materials, Fractal and Frequency Selective Surfaces, Santiago de Compostela, Spain, Mar. 2004.
    ●    M. Ng Mou Kehn, P.-S. Kildal and S. P. Skobelev, Miniaturized dielectric-loaded rectangular waveguides for use in multi-frequency arrays, Proc. IEEE AP-S Int. Symp. 2004, vol. 1, pp. 803-806, Monterey, USA, Jun. 2004.
    ●    M. Ng Mou Kehn and P.-S. Kildal, Study of propagation in compact hard quasi-TEM waveguides for use in multi-frequency antenna arrays, Proc. Antenn 03 Nordic Antenna Symp., pp. 243-248, Kalmar, Sweden, May 2003.
    ●    M. Ng Mou Kehn and P.-S. Kildal, Investigation of dielectric-loaded hard-walled rectangular waveguides using a numerical spectral domain technique, Proc. IEEE AP-S Int. Symp. 2003, vol. 2, pp. 1157-1160, Columbus, USA, Jun. 2003.
    ●    M. Ng Mou Kehn and P.-S. Kildal, The N-Guide: a novel miniaturized hard quasi-TEM waveguide, Proc. IEEE AP-S Int. Symp. 2003, vol. 2, pp. 1111-1114, Columbus, USA, Jun. 2003.
    ●    M. Ng Mou Kehn and P.-S. Kildal, “Analyzing propagation characteristics of hard waveguides using FDTD;IEEE AP-S Int. Symp. 2002 vol. 3, pp. 790-793, San Antonio, USA, Jun. 2002.

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