A photonic approach using two quadrature optical power ratios is proposed to peerform microwave frequency measurement. First, under the carrier-suppression and single-sideband modulation, a microwave signal is applied to modulate a cont; nuous-wave (CW) laser source, leading to the generation of a single sideband., Then optical comb filters are adopted to process the sideband and two optical powers presenting sine-form and cosine-form distributions are detected as the microwave frequency increases. After comparing the two optical powers to the reference power, two optical power ratios of sine-form and cosine-form are obtained, namely quadurature optical power ratios. Based on the two optical ratios, the frequency is unambiguously estimated within the full free spectral range (FSR) of the comb filtering responses. Two setups are designed to verify the proposed approach, one consisting of two laser sources and a single comb filter, and the other including a single laser source and two comb filters. The latter setup is experimentally demonstrated. Compared with other reported approach, the proposed approach provides a larger measurement range and a promising way to design cascaded or parallel configurations.