APPLICATION OF THE ISOPARAMETRIC FINITE-ELEMENT INTEGRAL EQUATIONS METHOD TO G. Jeng, M.H. Lean, and A. Wexler ABSTRACT A refined numerical technique, based on a variational approach using isoparametric finite-elements is presented for the solution of three-dimensional electromagnetic scattering problems. This technique allows a higher-order approximation of the unknown function over a bound

NUMERICAL SOLUTION OF THE APERTURE BACKED BY A RECTANGULAR CAVITY FIELD INTEGRAL EQUATION FOR A WIDE SLOT Kari Suneli ABSTRACT A two-dimensional vector integral equation for the tangential electric field distribution in a cavity-backed aperture is presented. The solution of the integral equation for a rectangular cavity by the method of moments is discussed. The expansion and testing funct

ON THE CYLINDRICAL ELECTROMAGNETIC AND SPHERICAL WAVES SPECTRAL CONTENTS OF RADIATED FIELDS *E.B. Abstract: Ojeba and General +C.H. Walter for the cylindrical and spherical expressions wave ex- pansion coefficients of the field of an arbitrary antenna are determined, using the dyadic Green's function, expanded in the appropriate vector waves. The upper limit on the amplitudes of these

A COMPARATIVE COEFFICIENTS STUDY OF GTD AND PHYSICAL OPTICS DIFFRACTION FOR AXIALLY SYMMETRIC REFLECTORS Mehmet §afak ABSTRACT The diffraction coefficients of the qeometrical theory of diffraction (GTD) and those of the physical optics (PO) are compared. A unified method for calculating the complete scattered patterns of all the axially symmetric reflectors (spheroid, ellipsoid, parabol

SHADOWING OF AN INHOMOGENEOUSPLANE WAVE BY AN EDGE Henry L. Bertoni, Arthur C. Green and Leopold B. Felsen Abstract - When an inhomogeneous plane wave or other type of evanescent field in a lossless medium strikes a large opaque object, the boundary of the shadow zone is displaced from the familiar geometric optical location for non-evanescent fields. This change is attributable to the co

PROPAGATION IN SHIELDED HELICAL LI~~ CONTAINING ~~GNETISED LATCHING FERRITE AZIMUTHALLY K.F. Ivanov+) ABSTRACT The propagation in an infinitely long thin-wire cylindrical helix, surrounded by a latching ferrite tube, magnetised azimuthally to remanence and perfectly conducting metallic shield is studied theoretically. The characteristic equation of the system for circularly symmetrical mode, i

A MULTI OCTAVE EDGE MODE NON RECIPROCAL PHASE SHIFTER L. COURTOIS + - G. FORTERRE - J. MARCOUXx ABSTRACT A non reciprocal phase shifter using an electromagnetic surface wave (OSEL) in a ferrite strip line is presented. The characteristic equation of a strip line using a composite medium (fetrite - dielectric or ferrite - ferrite) is established for the forward and reverse TE modes. Three

APERTURED FERRITE SLAB SUBSIDIARY RESONANCE POWER LIMITERS L.K. Brundle, M.D. Coleman, S.R. Longley* ABSTRACT New geometrical structures of ferrite and dielectric, in standard rectangular waveguide, have been employed as subsidiary resonance power limiters for X-band receiver protection. The structures consist of monolithic ferrite slabs containing circular or rectangular apertures some of whi

THE MODAL SPECTRUM OF FERRITE-LOADED STRIPLINES, II Donald M. Bolle * ABSTRACT: This paper expands upon earlier results obtained for the dispersion characteristics and modal structure of a waveguiding geometry which models the inhomogeneously ferrite load stripline. These results strongly indicate that components presumed to employ the edge-guided peripheral mode to obtain isolation in fact

NEW THEORETICAL WAVE JUNCTION MODELS AND COMPUTER PROGRAMS FOR ACCURATE DESIGN OF MICRO- CIRCULATORS and B. Hansson G. Fil ipsson ABSTRACT This paper presents some of the results zation and design of microwave junction microstrip applications. obtained in a project for optimicirculators for stripline and A new set of expressions for the ferrite permeability parameters has been developed