Effects of array guided surface waves on radiation characteristics of a finite planar printed dipole array

2004-06-26
The presence of surface waves different from the conventional grounded dielectric substrate surface wave modes, which can be excited on a finite periodic radiating array of printed dipoles, at frequencies for which the spacing between dipoles is typically less than half a wavelength is studied. The effects of such array guided surface waves on the array radiation characteristics are investigated. Techniques to suppress these surface waves are also discussed.
IEEE Antennas-and-Propagation-Society International Symposium

Suggestions

Influence of nanoparticle shape on colloidal plasmonic interface properties
Sarıgül, Elif; Bek, Alpan; Department of Physics (2014)
Nanoparticles bearing free charges, interact very strongly with incoming electromagnetic radiation at certain frequencies called the plasmon resonance frequencies, depending on the size, shape and material properties of the particle and the medium. In order to enhance the light scattering by a two dimensional network of such plasmonic nanoparticles several strategies can be followed. In this thesis, it was pursued the fabrication and characterization of the nanoparticle decorated surfaces by colloidal solut...
Effects of experimental parameters in monitoring the hydration of cement mortars by ultrasonic testing
Keskin, Ö. Kasap; Yaman, İsmail Özgür; Tokyay, Mustafa (2012-12-01)
In ultrasonic pulse velocity testing, frequency and the travel path length are important parameters that determine the attenuation rate and the influence of near-field effect. Higher frequencies and longer distances result in higher attenuation. On the other hand, smaller path lengths are not desirable due to near-field effect. This study investigated the effect of transducer frequency and the length of path used to determine ultrasonic wave velocity in monitoring the hydration process of fresh cement morta...
Calculation of the Dielectric Constant of a Ferroelectric Liquid Crystal From a Mean Field Model
YURTSEVEN, HASAN HAMİT; Yurtseven, Hasan Hamit (2011-01-01)
The static dielectric constant epsilon(perpendicular to) of the ferroelectric liquid crystal 4-(3-methyl-2-chlorobutanoyloxy)-4'--heptyloxybiphenyl (A7) with high spontaneous polarization is calculated as a function of temperature using a mean field model. This calculation is performed close to the smectic A-isotropic liquid (SmA-I) transition for pure optically active compound (T-c = 81.6 degrees C). For this calculation of epsilon(perpendicular to), the free energy of the SmA phase is expanded in terms of...
Influence of oxygen plasma modification on surface free energy of PMMA films and cell attachment
Ozcan, Canturk; Zorlutuna, Pinar; Hasırcı, Vasıf Nejat; Hasırcı, Nesrin (2007-10-04)
For any biomaterial placed into a biological medium, the surface properties of the material, such as porosity, crystallinity, presence and distribution of electrical charge and functional groups are very critical parameters that determine the acceptance or rejection of the material. Applications, especially tissue engineering require some surface modifications at the molecular level without disturbing the bulk properties of the implants in order to enhance the cell attachment on the material. An appropriate...
Effects of surface potential fluctuations on DLTS of MOS structure
Ozder, S; Atilgan, I; Katircioglu, B (1996-02-01)
Although the conventional large signal deep-level transient spectroscopy (DLTS) technique is immune to surface potential fluctuations resulting from interface charge inhomogeneities in a MOS structure, in energy resolved, small signal DLTS, the eventual surface potential fluctuation should be considered. In this paper, the effect of the potential fluctuation on the temperature-scan DLTS signal for a given gate bias has been carried out. In fact, this effect shifts the DLTS peak position to lower temperature...
Citation Formats
H. Ö. Aydın Çivi and P. Pathak, “Effects of array guided surface waves on radiation characteristics of a finite planar printed dipole array,” presented at the IEEE Antennas-and-Propagation-Society International Symposium, Monterey, CA, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37116.