Null point elimination using RF phase shifter in continuous-wave Doppler radar system

W. Pan, J. Wang, J. Huangfu, C. Li, L. Ran

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

A voltage-controlled tunable phase shifter is introduced in the architecture of a microwave Doppler radar to eliminate the null point problem in the non-contact vital sign detection. With a simple control mechanism, the phase of the demodulated signal can be effectively adjusted, providing an opportunity to always lock the radar system to the optimum point. Experiment demonstrates that such a method results in a significant improvement in measurement accuracy.

Original languageEnglish
Pages (from-to)1196-1198
Number of pages3
JournalElectronics Letters
Volume47
Issue number21
DOIs
StatePublished - Oct 13 2011

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