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Time-delay multiplexing of two beams in a terahertz imaging radar

N. Llombart ; K. B. Cooper ; R. J. Dengler ; Tomas Bryllert (Institutionen för mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik ) ; G. Chattopadhyay ; P. H. Siegel
IEEE Transactions on Microwave Theory and Techniques (0018-9480). Vol. 58 (2010), 7 PART 2, p. 1999-2007.
[Artikel, refereegranskad vetenskaplig]

We demonstrate a time-delay multiplexing technique that doubles the frame rate of a 660-690-GHz imaging radar with minimal additional instrument complexity. This is done by simultaneously projecting two offset, orthogonally polarized radar beams generated and detected by a common source and receiver. Beam splitting and polarization rotation is accomplished with a custom designed waveguide hybrid coupler and twist. A relative time lag of approximately 2 ns between the beams' waveforms is introduced using a quasi-optical delay line, followed by spatial recombination using a selectively reflective wire grid. This delay is much longer than the approximately 20-ps time-of-flight resolution of the 30-GHz bandwidth radar, permitting the two beams' reflected signals from a compact target to be easily distinguished in digital post-processing of the single receiver channel.

Nyckelord: Millimeter waves, submillimeter-wavelength imaging, terahertz radar

Denna post skapades 2011-04-20. Senast ändrad 2017-08-17.
CPL Pubid: 139548


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