Directional filter system

Wave transmission lines and networks – Coupling networks – Wave filters including long line elements

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Details

333137, 333212, 333248, H01P 1207, H01P 1208, H01P 1209

Patent

active

047806940

ABSTRACT:
A filter system is composed of two identical filters coupled between an input waveguide and an output waveguide to provide a 4-port directional filter characteristic operable with quasi-elliptic linear modes of electromagnetic propagation within each of the filters. Each of the filters may be constructed of a plurality of cavities arranged serially, one behind the other, with one of the cavities in each of the filters being employed for coupling electromagnetic power between the two waveguides. The coupling is accomplished by use of a transverse slot and a longitudinal slot in each of the waveguides, the slots extending through sidewalls of the waveguides into walls of the cavity in each of the filters for symmetric and antisymmetric coupling, respectively, of longitudinal and transverse components of a transverse electric wave in each of the waveguides. A phase quadrature relationship between components of a magnetic field coupled from the input waveguide is retained by the filters and, upon radiation via the slots into the output waveguide, results in the generation of an output wave in only one direction from the output waveguide, there being cancellation of a wave in the opposite direction from the output waveguide.

REFERENCES:
patent: 3074033 (1963-01-01), Smith
patent: 3234555 (1966-02-01), Petrilla et al.

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