The four necessary physical conditions have been established theoretically to achieve high-performance nonreciprocal coaxial devices for use at low microwave frequencies and in the UHF region. Theoretical differential phase shift of 180° pet inch of line length has been obtained in the 3000-Mcps range. The exact electromagnetic field patterns of the parallel-plate ana¬log of the coaxial line have been plotted. The conditions for the efficient operation of a ferrite-loaded coaxial resonance isolator have been described.
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