Time-delay multiplexing of two beams in a terahertz imaging radar
Journal article, 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, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

Goutam Chattopadhyay

P. H. Siegel

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN) 15579670 (eISSN)

Vol. 58 7 PART 2 1999-2007

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering



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