Time-delay multiplexing of two beams in a terahertz imaging radar
Artikel i vetenskaplig tidskrift, 2010

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.

terahertz radar

Millimeter waves

submillimeter-wavelength imaging


N. Llombart

K. B. Cooper

R. J. Dengler

Tomas Bryllert

Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik

Goutam Chattopadhyay

P. H. Siegel

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN) 15579670 (eISSN)

Vol. 58 7 PART 2 1999-2007


Elektroteknik och elektronik



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