We present experimental demonstration of phase conjugation using nonlinearmetamaterial elements. Active split-ring resonators loaded with varactor diodesare demonstrated theoretically to act as phase-conjugating or time-reversingdiscrete elements when parametrically pumped and illuminated with appropriatefrequencies. The metamaterial elements were fabricated and shown experimentallyto produce a time reversed signal. Measurements confirm that a discrete arrayof phase-conjugating elements act as a negatively-refracting time reversal RFlens only 0.12$\lambda$ thick.
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