In an aplanatic optical system, where the entrance pupil is not located at the front focal plane, a corresponding quadratic phase is expected at the back focal plane. However, tightly focused optical fields evaluated by methods based on the traditional Richards-Wolf approach, lacks this quadratic phase. In the current work we calculate the focused field, for both high and medium numerical apert...

An efficient physical optics (PO) calculation method is proposed for the electromagnetic (EM) scattering of electrically large targets coated with magnetized plasma characterized by asymmetric tensor dielectric parameters. The outer surface arbitrarily shaped target discretized into triangular elements. According to principle tangent plane approximation and using wave spectrum expansion method,...

Full-wave electromagnetic simulations of electrically large arrays of complex antennas and scatterers are challenging, as they consume large amount of memory and require long CPU times. This paper presents a new reduced-order modeling technique to compute scattering and radiation from large arrays of complex scatterers and antennas. In the proposed technique, each element of the array is replac...

In an aplanatic optical system, where the entrance pupil is not located at the front focal plane, a corresponding quadratic phase is expected at the back focal plane. However, tightly focused optical fields evaluated by methods based on the traditional Richards-Wolf approach, lacks this quadratic phase. In the current work we calculate the focused field, for both high and medium numerical apert...

It is demonstrated that there is a common theoretical basis for the Singularity Expansion Method (SEM) and stabilized, preconditioned electric field and magnetic field integral equations (EFIE, MFIE) defining radiation and scattering from a closed perfect electric conductor in a homogeneous medium. An operator relation termed the Calderon preconditioner links the MFIE and EFIE, based on the fun...

The renewed interest in the methods of electromagnetic field decomposition into upgoing and downgoing parts is generated by the practical problem of removing the effect of EM airwaves on marine controlled source electromagnetic data collected in shallow water. In this paper we consider the principles of solving this problem using the classical methods of EM field separation into external and in...

Co-plarized of radar backscattering coefficient 0 hh σ and 0 vv σ are estimated for soil surface using a standard theortical model IEM (Integrtion Eequation Model). The surface parameters for model are , dielectric constant and roughness, are determined by experimental technique. The real and imaginary parts ( ε' and ε") of dielectric constant of soil determine by wave guide cell method at a si...

It is well-known that a strong longitudinal electric field and small spot size are observed when radially polarized beams tightly focused using high numerical aperture parabolic mirror. The component can accelerate electrons along the propagation axis at intensities in focal region, which opens an application particle acceleration. In this paper, we present rigorous derivation of obtained polar...

In this paper, Small planar focal plane array (FPA) for millimeter-wave (MMW) imaging system is realized by adding an extended hemispherical lens to a scanning and focusing system, which is composed of a scanning planar mirror and a focusing parabolic mirror. Firstly, optical path and spot-patterns for different incident angles are calculated and compared without or with an extended hemispheric...

Laplacian potential fields in stratified media are usually analyzed using an integral equation for an unknown function over the union of all the interfaces between regions with different homogeneous materials. In this paper, the field problem is solved using a reduced integral equation involving a single unknown function over only the boundary of the source region. The new integral equation is ...