Abstract
A compact 24 GHz quadrature Doppler radar front-end monolithic microwave integrated circuit (MMIC) with Tx leakage canceller is developed. The chip is 3 × 2 mm2 and the front-end module is 3 × 3 cm2. The MMIC consists of a 24 GHz voltage-controlled oscillator, a Tx leakage canceller and two mixers. The radar module can measure speeds as low as 2.5 mm/s, which corresponds to a 0.41 Hz Doppler shift. The quadrature topology enables the signs of a Doppler shift to be detected and obviates the null point problems.
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