Effects of anisotropy of ferrite coating on the radiation characteristics of a cylindrical conductor excited by elementary sources

In this paper, radiation characteristics of an arbitrarily oriented source in an anisotropic multilayered cylindrical structure are investigated by using the state transition matrix approach. Full wave transversal field equations in spectral domain are derived for anisotropic medium in cylindrical coordinates. These expressions are formed into a set of linear first order differential equations. The solution at each layer is expressed in terms of the state transition matrices which are evaluated numerically. Fields are matched at the interfaces. Far fields are evaluated asymptotically by using the steepest descents method. Numerical results are presented for a conducting cylinder coated with an anisotropic ferrite excited by Hertzian dipole. The effects of changing the bias magnetic field of the ferrite and the other medium parameters on the radiation characteristics are examined. Beam scanning, beam splitting, pattern shaping, beamwidth adjustment and control on cross polarized component can be obtained by varying the medium parameters.


Characteristics of HfO2 and SiO2 on p-type silicon wafers using terahertz spectroscopy
Altan, Hakan; Pham, D.; Grebel, H.; Federici, J. F. (IOP Publishing, 2007-05-01)
The effect of high-kappa dielectric HfO2 films on 200 mm diameter p-type silicon substrates was investigated and compared with conventional dielectric material, SiO2. We employed all-optical characterization methods using terahertz (THz) time-domain spectroscopy and visible cw pump/THz probe spectroscopy. Measurements were performed on two sets of samples, each set containing both HfO2 and SiO2 coated wafers with varying thickness of oxide layer. One set had a protective coating of either photoresist or Si3...
Effect of Li addition on the properties of Bi-based superconductors
Ogun, SE; Ozkan, H; Hasanlı, Nızamı (Institute of Electrical and Electronics Engineers (IEEE), 2003-06-01)
The effect of Li addition on the formation and properties of Pb containing Bi-based superconductors has been studied. Three successive thermal sintering cycles have been applied to the oxides adjusted for the nominal composition, Bi1.6Pb0.4Sr2CaCu2O8+d. Eight different samples having Li2CO3 from 0.0 up to 3.0 weight% have been synthesized, X-ray diffraction patterns, resistivity-temperature behaviors and differential thermal analysis of the samples have been examined. Li2CO3 addition at 650degreesC decrease...
Effects of screening on the two-dimensional electron transport properties in modulation doped heterostructures
Sen, O; Beşikci, Cengiz; Tanatar, B (Elsevier BV, 1998-06-01)
The effects of screening on the polar optical phonon scattering rates and on the transport properties of the two-dimensional electron gas in AlGaAs/GaAs modulation doped heterostructures have been investigated through Monte Carlo simulations incorporating the three valleys of the conduction band, size quantization in the Gamma valley and the lowest three subbands in the quantum-well. At typical sheet densities observed in modulation doped field-effect transistors, screening considerably affects the electron...
Structural and electronic properties of carbon-doped c-BN(110) surface
Kökten, Hatice (Elsevier BV, 2009-12-15)
The structural and electronic properties of a substitutional C atom in a neutral charge state on both the B and N site of the c-BN(110) surface have been investigated from a theoretical point of view using density functional theory. The impurity formation energies [unrelaxed (E(f)(0)) and relaxed (E(f))] are reported for the first time for the c-BN(110) surface.
Effects of Si nanowire on the device properties of n-ZnSe/p-Si heterostructure
COŞKUN, EMRE; Gullu, H. H.; Colakoglu, T.; Emir, C.; Bozdogan, E.; Parlak, Mehmet (Springer Science and Business Media LLC, 2019-03-01)
The semiconductor nanowire (NW) technology has raised attention owing to its one-dimensional geometry as a solution for lattice mismatch in the fabricated heterostructures. Although, SiNWs have been investigated for various device technologies, there is no published work on the p-n junction formed by deposition of ZnSe thin film on these NW structures, in which this film layer has significant optical and electrical properties in optoelectronics applications. The aim of this study is determining the device p...
Citation Formats
H. Ö. Aydın Çivi, “Effects of anisotropy of ferrite coating on the radiation characteristics of a cylindrical conductor excited by elementary sources,” JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS, pp. 287–307, 1998, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/39350.