The present invention relates to an imaging device (1) comprising:- a first microwave frequency sensor or set of sensors (2), preferably radiometric, each microwave frequency sensor (2) being configured so as to sense electromagnetic radiations emitted or reflected by bodies or objects situated in a zone of detection of said microwave frequency sensor (2), and - a reflecting means (6) configured so as to reflect the electromagnetic radiations that may be sensed by the first microwave frequency sensor or set of microwave frequency sensors (2). In particular, the reflecting means (6) is mounted movably in the zone of detection of each microwave frequency sensor (2), so as to displace said detection zone by displacing the reflecting means (6). The invention also relates to a corresponding method of microwave frequency imaging.