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A 96-GHz CMOS oscillator is demonstrated in this brief with the use of a high-Q metamaterial resonator. The proposed metamaterial resonator is constructed by a differential transmission line (T-line) loaded with complementary split-ring resonator engraved on the T-line. A negative real part of permittivity, i.e., , is observed near the resonance frequency, which introduces a sharp stopband and, thus, leads to a high-Q resonance. This brief is the first in literature to explore CMOS on-chip metamaterial resonator for oscillator design at the millimeter-wave frequency region. Compared with the existing oscillators with a LC-tank-based resonator at around 100 GHz, the proposed 96-GHz oscillator with high- metamaterial resonator shows much lower phase noise of 111.5 dBc/Hz at 10-MHz offset and figure-of-merit of 182.4 dBc/Hz.