The μ r ′′ values show an increasing trend from −1.90 to −3.2 at 2 GHz with an increase in annealing temperature from 650 °C to 1250 °C.
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Tunable Twin Matching Frequency (f<sub>m1</sub>/f<sub>m2</sub>) Behavior of Ni<sub>1-x</sub>Zn<sub>x</sub>Fe<sub>2</sub>O<sub>4</sub>/NBR Composites over 2-12.4 GHz: A Strategic Material System for Stealth Applications.
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