A STUDY OF A FERRITE PHASE SHIFTER.
NAVAL RESEARCH LAB WASHINGTON D C
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A study of a DOFL-type phase shifter was conducted at S-band. This phase shifter was capable of operation at power levels above 10 kw peak power. Phase shift and loss were determined as a function of several parameters ferrite width and height, waveguide height, and presence or absence of dielectric. High power measurements consisted of measuring loss as a function of power level. At low power levels, for a given width of ferrite, much more phase shift can be obtained if the ferrite only partially fills the waveguide in height, but when the height gap is filled with dielectric as required at high power levels, at most a 20 improvement can be obtained over ferrite filling the entire height. In the range of values studied, if the waveguide height is ferrite filled, increasing the ferrite width or waveguide height increases the maximum phase shift while having little effect on loss, this improvement also occurring at high power levels. Author