Echelle crossed grating millimeter wave beam scanner.

TitleEchelle crossed grating millimeter wave beam scanner.
Publication TypeJournal Article
Year of Publication2014
AuthorsO Furxhi, DL Marks, and DJ Brady
JournalOptics Express
Start Page16393
Pagination16393 - 16407
Date Published06/2014

We present a two-dimensional, active, millimeter-wave, electronic beam scanner, with Doppler capabilities for stand-off imaging. The two-dimensional scan is achieved by mapping the millimeter wave spectrum to space using a pair of crossed gratings. The active transceiver and heterodyne quadrature detection allow the measurement of the relative phase between two consecutive measurements and the synthesis of the scene's Doppler signature. The frame rate of the imager is currently limited by the sweep rate of the vector network analyzer which is used to drive the millimeter wave extenders. All of the beam steering components are passive and can be designed to operate at any wavelength. The system design, characterization and measurements are presented and further uses and improvements are suggested.

Short TitleOptics Express