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In this paper, a triple-band impedance matching network is introduced and applied to rectifier design. It can be used to realize impedance matching at three frequencies simultaneously. Theoretical analysis of the triple-band matching network is carried out, and a rectifier operating at 0.85, 1.77, and 2.07 GHz is designed, fabricated, and measured. Measurement results show that when the input power is 0 dBm, the measured maximum RF-to-dc power conversion efficiencies are 61.9%, 71.5%, and 60.5% at the frequencies of 0.85, 1.77, and 2.07 GHz, respectively. Compared with other related designs, the proposed rectifier features high efficiency and compactness. Thus, it is suitable for ambient RF energy harvesting application.