1,721,407 research outputs found
Analysis of integrated antennas on anisotropic substrate, Document 223TD(90),033: Italian Contribution to COST 223: Antennas in the 90’s-Active Array Antennas for Future Satellite and Terrestrial Communications
No full textRadiation of an electric point-source in a homogeneous omega medium
No full textIn recent yeats, new materials, suck as chiral, nonreciprocal, nonlinear, gyrotropic, high T-c superconducting and omega materials, have attracted special attention for their potential applications in microwave and millimetre wave engineering, as well as in the infrared and optical regime. This paper attempts to present a rigorous formulation of the problem of the radiation of an electric point-source embedded in an unbounded omega medium. The omega medium which falls into the class of bi-anisotropic media can be, from an electromagnetic point of view, thought of as a composite medium composed of an isotropic host material within which a large number of Omega-shaped metallic microstructures are embedded. Spectral and spatial Green dyads are introduced to express the spatial radiated electric field. Eventually, numerical computations of the electric radiated field are shown, in the case of an electric (x) over cap- and (z) over cap-oriented point-source
Analysis of Signal Integrity and Electromagnetic Interference of High Speed Digital Systems
No full textAbsorbing boundary conditions for the finite element solution of the electromagnetic vector wave equation
No full textPossible Applications of Cylindrical Stratified Structures Loaded with Complex Materials
No full textIn this paper we propose an analytical study in
the spectral domain of cylindrical layered structures filled
with general bianisotropic media and fed by a 3D electric
source. The integrated structure is characterized in terms
of transmission matrices leading to an equivalent circuit
representation of the whole multilayered structure. Within
the framework of this two-port formalism, we present a
new contribution to the computation of the Green's function arising in the analysis of multilayered conformal integrated antennas loaded with general bianisotropic materials. We also propose an analytical study of the shielding
effectiveness of general bianisotropic materials located in
multilayered, cylindrical configuration. The expression of
the shielded fields sustained both by plane wave and arbitrary sources is obtained in a closed analytical form. Numerical results are also presented showing effects of electromagnetic parameters on radiation pattern, matching properties and radar cross section of the integrated structure
SPECTRAL ELECTROMAGNETIC MODELING OF A PLANAR INTEGRATED STRUCTURE WITH A GENERAL GROUNDED ANISOTROPIC SLAB
No full textIn this paper a formulation for the solution of the electromagnetic field in vertically stratified structures with a general anisotropic grounded slab under planar electric excitation conditions is presented. The development of the solution is obtained by using the two-dimensional (Fourier) transform applied to the partial differential equations describing the electromagnetic field, which can be expressed in terms of dyadic electric Green functions. Moreover, a spectral equivalent circuit representation of the solution, separated into its spectral transverse electric (TE) and transverse magnetic (TM) components (with respect to the vertical direction), is given. It is demonstrated that such a spectral circuit representation is always possible when the constitutive epsilonunderbar and muunderbar tensors are reduced to their diagonal form. Finally, we present the transmission-line representation for an unbounded gyrotropic medium with vertical preferred axis, and we then apply this theory to a planar structure with an anisotropic biaxial grounded slab and an electric horizontal point source embedded in it. Numerical examples of evaluation of the radiated pattern and noteworthy information about the radiation on the horizon plane are given with constraints on the electromagnetic parameters, thickness of the slab, working frequency, and source position
- …
