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A Quadrature Radar Topology With Tx Leakage Canceller for 24-GHz Radar Applications

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3 Author(s)
Choul-Young Kim ; Korea Adv. Inst. of Sci. & Technol., Daejeon ; Jeong-Geun Kim ; Songcheol Hong

A quadrature radar topology with a Tx leakage canceller is presented. The canceller is composed of four branch-line hybrid couplers, a 90deg delay line, and a Wilkinson combiner. It has high Tx-to-Rx isolation and wide bandwidth characteristics. The isolation is 35.27 dB at 24 GHz and does not drop below 30 dB over a 2-GHz bandwidth. Given that the isolation of the branch-line hybrid coupler is 21.5 dB, the enhancement of the isolation is expected to be 13.77 dB. A quadrature Doppler radar front-end with the canceller was implemented. The noise level in the mixer output is lower by 9 dB compared with that of a conventional quadrature radar. This radar can measure speed as low as 0.76 mm/s, which correspond to a 0.12-Hz Doppler shift. It is also able to detect signs of the Doppler shift from a moving target due to its quadrature topology.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:55 ,  Issue: 7 )