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This letter studies the property of a divide-by-2 quadrature injection-locked frequency divider (QILFD) with dual-resonance resonator. The QILFD consists of a transformer-coupled quadrature voltage controlled oscillator and two NMOS injectors. The proposed QILFD has been implemented with the TSMC 0.18 μm CMOS technology and the core power consumption is 3.4 mW at the supply voltage of 0.75 V. At the input power of 0 dBm, the low-band and high-band divide-by-2 operation ranges are respectively from 6.3 GHz to 8.2 GHz and 8.1 GHz to 10.3 GHz. The high-frequency band tuning range of free-running QILFD can be measured after the power-on, and the low-frequency band tuning range of free-running QILFD can be measured only after the low-frequency band injection signal is injected to the QILFD.