Ferrite/Dielectric High Power Phase Shifter Development Part II. On Broadband Y-Junction Circulators.
Final rept. 26 Jul 71-26 Jan 73,
MONSANTO RESEARCH CORP DAYTON OH DAYTON LAB
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The significance of this research and development to the Air Force is the finding that MIC junction circulators can have octave bandwidths without sacrifice of other properties. The study began with a review of current theory and design practices. It was found that previous workers did not consider appropriate modes in the Greens Function, limited the range of coupling angle, and failed to consider the effects of fringe fields on the quarterwave transformers. This study considered the n 0,1,2,3 modes, included the coupling angle as a variable, and developed two conditions for perfect circulation. Condition 1 defines the propagation constant-radius product SR while Condition 2 gives the substrate to disk impedance ratio at the junction. Both sets of curves are related to the anisotropic splitting ratio. The Condition 2 curve and the junction impedance curve can be made to overlap by proper choice of materials. The circulator can thus operate over a wide range of SR whereas by earlier design methods these were fixed values. Through proper choice of 4 pi Msubs octave bandwidths can be acheived. Experimental work has verified these findings and the device has been named the Continuous Tracking Circulator.
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