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Analysis and design of microstrip-slot line for phase shifting applications

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2 Author(s)
E. -B. El-Sharawy ; Dept. of Electr. & Comput. Eng., Massachusetts Univ., Amherst, MA, USA ; R. W. Jackson

The analysis and design of printed phase shifters based on the microstrip line are described. A spectral-domain analysis is presented where the necessary Green's functions are formulated using the transmission matrix technique. The nonreciprocal characteristics for single-layer and multilayer structures are studied. Microstrip-slot in a multilayer structure of ferrite and high-dielectric material is found to have considerably more nonreciprocity than microstrip-slot for microstrip in a single-layer structure. Over 65°/cm is predicted for certain optimized designs. This, in addition to the 50-Ω design capability of the line, makes the microstrip-slot line a suitable choice for phase shifting applications. A multilayer microstrip-slot line was constructed on a rectangular ferrite toroid. Differential phase shifts of roughly 45°/cm were measured over a 6.0-8.5-GHz frequency range. These results are in good agreement with the analysis

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IEEE Transactions on Microwave Theory and Techniques  (Volume:38 ,  Issue: 3 )