Microwave Microphone Using a General Purpose 24-GHz FMCW Radar

Eloi Guerrero, Josep Brugues, Jordi Verdu, Pedro de Paco

Research output: Contribution to journalArticleResearchpeer-review

15 Citations (Scopus)


The usage of a commercial 24-GHz frequency-modulated continuous-wave radar sensor to retrieve sound signals is investigated in this letter. Thanks to the great phase measurement capabilities of current radar sensors, low-frequency audio signals can be recovered by measuring the vibrations they induce in objects due to their pressure wave nature. To prove the concept, a sound emitted by a speaker is recorded by analyzing the small-scale displacement of a reflective surface using a radar sensor originally devised for automotive and unmanned aerial vehicle (UAV) applications at the 24-GHz industrial, scientific, and medical band.
Original languageEnglish
JournalIEEE Sensors Letters
Issue number6
Publication statusPublished - Jun 2020


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