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Frequency conversion studies conducted upon polycrystalline ferrites and yttrium iron garnets have established that microwave mixing displays a linear dependence upon input powers. Sum and difference signal powers generated in ferrites and garnets were examined as a function of rf power and sample shape. Conversion efficiencies of −14 db for sum signal output and −36 db for difference signal output were achieved for magnesium manganese ferrite at X band.

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