This paper proposes a single-layered dual-band patch antenna using a CRLH mushroom-like metamaterial structure. The antenna is compact, it can achieve maximum gains of 2.29 dBi at 2.76 GHz and 7.06 dBi at 4.27 GHz, with a monopole-like and a patch-like radiation pattern, respectively. The bandwidths for the reflection coefficient less than -10 dB are 28 MHz at the low frequency band and 130 MHz at the high one. The proposed compact dual-band antenna exhibits an overall size of 0.18λ_0×0.18λ_0×0.03λ_0 at 2.76 GHz.
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