System separating filter for separating first and second doubly

Details System separating filter for separating first and second doubly System separating filter for separating first and second doubly

1975-09-10

1976-08-31

Gensler, Paul L.

Wave transmission lines and networks

Plural channel systems

With balanced circuits

333 21A, 333 73W, 333 98R, H01P 116, H01P 120, H01P 512

Patent

active

039784347

ABSTRACT:
A system separating filter for separating first and second signals each consisting of a doubly polarized frequency band with the two bands being of different frequencies. The filter includes first, second and third series connected doubly polarizable waveguide sections with the first waveguide section having an inner cross section of such dimensions that both frequency bands can exist therein with their respective dual polarizations, and with the second waveguide section serving as a transition piece between the first waveguide section and the third waveguide section which has an inner cross section of such dimension that at least the second frequency band can exist. Means are provided for causing the first frequency band to form standing waves in the second waveguide section which is provided with two coupling arrangements, each associated with one of the two directions of polarization and each including a pair of coupling elements which are symmetrically disposed opposite one another in the walls of the second waveguide section, for coupling out the first frequency band and blocking the second frequency band, with the electrically effective reflection plane of each coupling arrangement effecting a total reflection for the second frequency band. The outputs of each coupling arrangement are connected together via a respective hybrid circuit so that a signal corresponding to each polarization of the first frequency band is separately available at the summing output of the associated hybrid circuit. A polarization filter is connected to the third waveguide section to provide separate output signals corresponding to the two polarizations of the second frequency band.

REFERENCES:
patent: 3731235 (1973-05-01), Ditullio et al.
patent: 3731236 (1973-05-01), Ditullio et al.
patent: 3838362 (1974-09-01), Kurtz
patent: 3914764 (1975-10-01), Ohm

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