GB665736A - Improvements in or relating to electro-magnetic wave transmission systems - Google Patents

Abstract

665,736. Wave-guides. WESTERN ELECTRIC CO., Inc. April 3, 1947 [April 8, 1946], No. 9076/47. Class 40 (viii). [Also in Group XL (c)] In an electromagnetic wave-guide or modechanging structure, certain of the walls of the structure are constructed of conducting elements spaced apart a distance substantially equal to or less than a quarter wavelength at the operating frequency. Waveguides. Figs. 1 and 2 illustrate the application of the invention to a rectangular and a circular wave-guide respectively. In Fig. 1, in which vertically-polarized waves of the H 10 type are transmitted, the side walls of the structure are constructed of conducting elements 7 spaced apart a distance S substantially equal to or less than a quarter-wavelength. In the circular guide of Fig. 2, the conductors are similarly spaced. Mode-changers. Fig. 4 illustrates arrangements for rotating the plane of polarization of an electromagnetic wave or for converting a plane-polarized wave analogous to those described in Specification 665,736, [Group XL (c)]. In the present arrangement the vertical walls 12 which are spaced apart by more than a halfwavelength are each constructed of a plurality of vertical conductors 17 spaced apart by less than a quarter-wavelength. The conductors are supported by guys slung between two towers 14. Specification 650,767, [Group XL (c)], also is referred to.