Radiation from slots in artificially soft and hard cylinders

Author

Ulversoy, Tore ; Kildal, Per-Simon

Author_Institution

Norwegian Inst. of Technol., Trondheim, Norway

Volume

37

Issue

12

fYear

1989

fDate

12/1/1989 12:00:00 AM

Firstpage

1628

Lastpage

1632

Abstract

The radiation fields of circumferential slots in soft and hard cylinders are calculated for the case in which the slots are excited by a TE₁₁ circular waveguide mode. The results are compared to those for a smooth conducting cylinder, showing that the soft surface strongly reduces the intensity of the field radiated along the cylinder whereas the hard surface enhances it. The results are applicable to the design of self-supported feeds for paraboloids, and to the analysis of the line feeds of the radio telescope at the Arecibo observatory. The calculations are confirmed by measurements

Keywords

antenna feeders; antenna radiation patterns; waveguide antennas; Arecibo observatory; TE₁₁ circular waveguide mode; antennas; circumferential slots; hard cylinders; line feeds; paraboloids; radiation fields; radiation pattern; radio telescope; self-supported feeds; soft surface; Antenna arrays; Antenna feeds; Antenna measurements; Electromagnetic scattering; Electromagnetic wave polarization; Electromagnetic waveguides; Reflector antennas; Slot antennas; Surface acoustic waves; Surface waves;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.45108

Filename

45108