EXPERIMENTAL STUDIES OF MICROWAVE FERRITE COMPONENTS. PART I. FERRITE LOADED SERIES FEED SYSTEM FOR PHASED ARRAYS; PART II. E-PLANE PARALLEL PLATE WYE-CIRCULATOR.
NAVAL RESEARCH LAB WASHINGTON D C
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The report describes the results of a study to determine if rf coupling from a ferrite loaded waveguide to an empty secondary waveguide can be employed as a series feed system for an electronically scanned phased array antenna. A fixed frequency of 9.375 Gc was used. Two classes of reciprocal phase shift ferrite configurations were studied one class employed broadwall coupling and the other class employed sidewall coupling. The various ferrite configurations were evaluated by observing the variation of phase shift per inch phi and coupling coefficient k as a function of longitudinally applied magnetic field. Design goals which these quantities phi and k should satisfy were specified from fundamental array considerations. Some factors which influence phi and k were determined. Two configurations which will work in principal were found, but neither is considered practical because of low values phi and k. The report describes a study undertaken to determine the feasibility of developing a ferrite wye-circulator in a parallel plate E-plane wye. Several preliminary ferrite configurations were observed. Circulation of the rf power was achieved using a pseudo waveguide configuration in the wye junction. Isolation as high as 15 db was observed although the junction was poorly matched. Author
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