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Showing papers by "Per-Simon Kildal published in 1992"


Journal ArticleDOI
01 Apr 1992
TL;DR: In this paper, a numerical parametric study of a circularly polarised square hard horn realised by dielectric-filled longitudinal corrugations is presented, and the horn is analyzed as an open waveguide.
Abstract: A numerical parametric study is presented, of a circularly polarised square hard horn realised by dielectric-filled longitudinal corrugations The horn is analysed as an open waveguide The attenuation introduced by losses in the dielectric material is calculated from the characteristic equation of the modified TE/sub 10/ mode The far field including radiation from the walls, is found from the electric vector potential The attenuation, aperture efficiency and crosspolar sidelobe level are presented for different dielectric linings and waveguide sizes, and are compared with the performance of the smooth-walled horn

14 citations


Proceedings ArticleDOI
18 Jun 1992
TL;DR: In this article, an integral equation is formulated and solved for the slot E-field, and the equivalent shunt admittance of the slot is then calculated for an isolated waveguide slot radiating into three different outer geometries: in an infinite ground plane, between baffles of infinite height, and between a set of finite height.
Abstract: The calculation of the equivalent admittance of a longitudinal slot radiating between baffles of finite height is discussed. A general method for analysis of waveguide slot antennas with arbitrary outer cross sections was introduced by Kildal et al. (1991). It was stated that, for large k/sub z/ values (wavenumber in z-direction), the slot cannot 'see' the environment around it and the problem can be considered equivalent to that of a slot radiating in an infinite ground plane. It is noted that, by using this concept, it becomes much easier to perform the inverse transform. To find the slot admittance, the H-field between the baffles is found by using a spectrum of 2-D solutions. An integral equation is then formulated and solved for the slot E-field. The equivalent shunt admittance of the slot is then calculated. The normalized 2-D field solution at the transverse location of the slot is shown as a function of k/sub z/ for an isolated waveguide slot radiating into three different outer geometries: in an infinite ground plane, between baffles of infinite height, and between baffles of finite height. >

2 citations