Topic
Physical optics
About: Physical optics is a research topic. Over the lifetime, 5342 publications have been published within this topic receiving 101388 citations. The topic is also known as: wave optics.
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TL;DR: In this article, a collection of papers written by leading researchers reflects the forefront of research in the dynamic field of quantum optics, including BEC, atomic optics, quantum information, cavity QED and quantum noise processes.
Abstract: This collection of papers written by leading researchers reflects the forefront of research in the dynamic field of quantum optics. Topics covered include BEC, atomic optics, quantum information, cavity QED and quantum noise processes.
23 citations
01 Oct 1968
TL;DR: In this article, the scattering of plane waves from perfectly conducting cylinders is studied, using the condition that the total field inside the cylinders must be zero, and it is shown that the surface current density can always be expressed as a sum of proper modes.
Abstract: The scattering of plane waves from perfectly conducting cylinders is studied, using the condition that the total field inside the cylinders must be zero. It is shown that the surface current density can always be expressed as a sum of proper modes. In general, fewer modes are required for calculating the scattered far field than are required for calculating the surface current density to the same accuracy. Two new approximate methods are introduced. These methods complement the method of physical optics, and the more accurate of them is suitable for calculating the scattering over a wide range of bistatic angles.
23 citations
TL;DR: In this paper, a delaminating quadrature method was proposed to calculate the physical optics (PO) integrals over non-uniform rational B-spline (NURBS) surfaces.
Abstract: Physical optics (PO) is a widely used radar cross section (RCS) estimation approach for electrically large-scaled objects, and it is finally reduced to the calculation of highly oscillatory integrals. In this paper the PO integrals over non-uniform rational B-spline (NURBS) surfaces is proposed to be calculated with a delaminating quadrature method. The method has the merits of being very stable, accurate, and fast, and its computation cost does not increase with frequency. Moreover, in order to keep these good properties for PO integrals involving critical points (stationary phase point, resonant point), a scheme of integral-subdividing is proposed, and new approaches for locating the critical points are also presented. Numerical examples of flat surface, cylindrical surface, and spherical surface well show the advantages of the new method.
23 citations
TL;DR: In this article, it is shown that the separation of the co-and cross-polar components of the primary field does not depend on the symmetry of the antenna, and that it holds even for off-set fed reflectors.
Abstract: It is well known that focussed, axial symmetrical reflector antennas collimate the co- and cross-polar components of the primary field separately, i.e., the reflector does not create a contribution to the cross polarization of the far-field. By a simple extension of a classical physical argument it is demonstrated that this separability does not depend on the symmetry of the antenna, and that it, therefore, holds even for off-set fed reflectors. A new mathematical formulation of the collimation is derived in which this is shown. Yet the separability does depend on how the co- and cross-polar fields are defined, and the cross polarization of feeds for asymmetric reflectors is discussed in detail in the light of this. It is further suggested how to design low cross polarization feeds for off-set fed antennas. As a consequence of the separate collimation such feeds will lead to low cross-polarization of the secondary fields. Two simple examples are treated. The only limitations of the results are those due to the application of the aperture field version of the physical optics approximation.
23 citations