ASYMMETRICAL COUPLED TRANSMISSION-LINE MODELING OF GROUNDED FERRITE SLAB AND ELECTRONIC BEAM SCANNING BY A SLOT ANTENNA IN A FERRITE SLAB

1993-07-02
AYDIN, O
HIZAL, A
Radiation characteristics of a slot antenna in a ground plane covered by a ferrite slab which is magnetized perpendicularly by a DC magnetic field are investigated. This structure has a beam steering feature controlled by a DC bias field. Fourier transformed field representations and asymmetric coupled transmission line modelling are used to analyze this strudure. Far fields are evaluated by the Method of Steepest Descents. Numerical results are obtained at frequencies between 18 and 35 GHz for different parameters of ferrite. Typically k35 degree scanning with 10- 1 degrees 3 dB beamwidth is obtained. The presented analysis can be easily applied to various radiation problems of sources in stratified media including anisotropic and dielectric slabs.

Suggestions

Radial motion of highly conducting sphere in magnetic field
Gurcan, OD; Mirnov, VV; Ucer, D (2000-05-01)
Radial motion of a highly conducting sphere in external magnetic field is considered. It both perturbs the external magnetic field and generates an electric field. Exact analytic solution has been obtained previously for a uniformly expanding sphere. In the present paper a new exact solution is derived which is valid not only for expansion but for contraction as well. It allows us to calculate analytically the total electromagnetic energy irradiated by the sphere involved in periodical radial motion with ar...
Anisotropic Conductivity Imaging with MREIT Using J-substitution and Hybrid J-substitution Algorithms
Degirmenci, E.; Eyüboğlu, Behçet Murat (2009-09-12)
Magnetic Resonance Electrical Impedance Tomography (MREIT) is a tomographical imaging technique which uses measurements of magnetic flux density induced by a probing current to reconstruct electrical conductivity distribution within a conductor object with magnetic resonance active nuclei. In this study, two novel anisotropic conductivity reconstruction algorithms for MREIT are proposed. The technique is evaluated with simulated measurements.
Induced Current Magnetic Resonance Electrical Impedance Tomography with z-Gradient Coil
Eroglu, Hasan H.; Eyuboglu, Murat (2014-08-30)
Magnetic Resonance Electrical Impedance Tomography (MREIT) is a medical imaging method that provides images of electrical conductivity at low frequencies (0-1 kHz). In MREIT, electrical current is applied to the body via surface electrodes and corresponding magnetic flux density is measured by means of Magnetic Resonance (MR) phase imaging techniques. By utilizing the magnetic flux density measurements and surface potential measurements images of true conductivity distribution can be reconstructed. In order...
Equipotential projection based MREIT reconstruction without potential measurements
Eyüboğlu, Behçet Murat (2007-09-02)
Magnetic resonance electrical impedance tomography (MREIT) is used to produce high resolution images of true conductivitv distribution. Images are reconstructed by utilising measurements of magnetic flux density distribution and surface potentials. Surface potential measurements are needed to reconstruct true conductivity values. In this study, a novel MREIT reconstruction algorithm is developed to generate conductivity images without utilizing the surface potential measurements. The proposed algorithm and ...
Electrical impedance tomography using the magnetic field generated by injected currents
Birgul, O; Ider, YZ (1996-11-03)
In 2D EIT imaging, the internal distribution of the injected currents generate a magnetic field in the imaging region which can be measured by magnetic resonance imaging techniques. This magnetic field is perpendicular to the imaging region on the imaging region and it can be used in reconstructing the conductivity distribution inside the imaging region. For this purpose, internal current distribution is found using the finite element method. The magnetic fields due to this current is found using Biot-Savar...
Citation Formats
O. AYDIN and A. HIZAL, “ASYMMETRICAL COUPLED TRANSMISSION-LINE MODELING OF GROUNDED FERRITE SLAB AND ELECTRONIC BEAM SCANNING BY A SLOT ANTENNA IN A FERRITE SLAB,” 1993, p. 372, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/64842.