Now showing items 1-10 of 10

    • Analytical regularization based analysis of a spherical reflector symmetrically illuminated by an acoustic beam 

      Vinogradov, S. S.; Vinogradova, E. D.; Nosich, A. I.; Altintaş, A. (IEEE, 2000)
      A mathematically accurate and numerically efficient method of analysis of a spherical reflector, fed by a scalar beam produced by a complex source- point feed, is presented. Two cases, soft and hard reflector surface, are ...
    • Electronic excited states of the CP29 antenna complex of green plants: a model based on exciton calculations 

      İşerı, E. İ.; Albayrak, D.; Gülen, D. (Springer / Kluwer Academic Publishers, 2000)
      We have suggested a model for the electronic excited states of the minor plant antenna, CP29, by incorporating a considerable part of the current information offered by structure determination, site-directed mutagenesis, ...
    • Exceptionally directional sources with photonic-bandgap crystals 

      Biswas, R.; Özbay, Ekmel; Temelkuran, B.; Bayindir, M.; Sigalas, M. M.; Ho, K.-M. (Optical Society of America, 2001-11)
      Three-dimensional photonic-bandgap crystals are used to design and fabricate uniquely directional sources and receivers. By utilizing the resonances of a Fabry-Perot cavity formed with photonic-bandgap crystals, we were ...
    • Experimental verification of metamaterial loaded small patch antennas 

      Alici, K. B.; Caliskan, M. D.; Özbay, Ekmel; Bilotti, F.; Toscano, A.; Vegni, L. (Emerald Group Publishing Limited, 2013)
      Purpose - Metamaterial unit cells composed of deep subwavelength resonators brought up new aspects to the antenna miniaturization problem. The paper experimentally demonstrates a metamaterial-inspired miniaturization method ...
    • Frequency dependent steering with backward leaky waves via photonic crystal interface layer 

      Colak, E.; Caglayan, H.; Cakmak, A. O.; Villa, A. D.; Capolino, F.; Özbay, Ekmel (Optical Society of America, 2009)
      A Photonic Crystal (PC) with a surface defect layer (made of dimers) is studied in the microwave regime. The dispersion diagram is obtained with the Plane Wave Expansion Method. The dispersion diagram reveals that the ...
    • Highly directional enhanced radiation from sources embedded inside three-dimensional photonic crystals 

      Caglayan, H.; Bulu, I.; Özbay, Ekmel (Optical Society of America, 2005)
      We have experimentally studied emission of microwave radiation from a monopole source embedded in a three-dimensional photonic crystal. We have demonstrated enhancement of microwave radiation at the band edge and cavity ...
    • Intravascular extended sensitivity (IVES) MRI antennas 

      Susil, R. C.; Yeung, C. J.; Atalar, E. (John Wiley & Sons, Inc, 2003)
      The design and application of an intravascular extended sensitivity (IVES) MRI antenna is described. The device is a loopless antenna design that incorporates both an insulating, dielectric coating and a winding of the ...
    • The left hand of electromagnetism : metamaterials 

      Alıcı, Kamil Boratay (Bilkent University, 2010)
      Metamaterials are artificial periodic structures whose electromagnetic response is solely dependent on the constituting unit cells. In the present thesis, we studied unit cell characteristics of metamaterials that has ...
    • Photonic crystal-based resonant antenna with a very high directivity 

      Temelkuran, B.; Bayindir, M.; Özbay, Ekmel; Biswas, R.; Sigalas, M. M.; Tuttle, G.; Ho, K. M. (American Institute of Physics, 2000-09-24)
      We investigate the radiation properties of an antenna that was formed by a hybrid combination of a monopole radiation source and a cavity built around a dielectric layer-by-layer three-dimensional photonic crystal. We ...
    • Ultrafast and sensitive bioassay using split ring resonator structures and microwave heating 

      Caglayan, H.; Cakmakyapan, S.; Addae, S. A.; Pinard, M. A.; Caliskan, D.; Aslan, K.; Özbay, Ekmel (American Institute of Physics, 2010-08-30)
      In this paper, we have reported that split ring resonators (SRRs) structures can be used for bioassay applications in order to further improve the assay time and sensitivity. The proof-of-principle demonstration of the ...