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This paper presents a broadband terahertz (THz) high-temperature superconducting (HTS) mixer based on a log-periodic antenna-coupled YBa2Cu3O7−x (YBCO) step-edge Josephson junction. The THz thin-film antenna, as well as the microwave coupling circuits, have been carefully designed to optimize the power transmission from and into the junction while realizing good isolation between the DC bias, local-oscillator...
We report on a monolithic extracting structure for terahertz quantum cascade laser based frequency combs. For a spectral bandwidth of more than 600 GHz at a center frequency of 2.5 THz a frequency comb with well-defined farfield pattern could be achieved. In addition the dynamic range of the frequency comb has been significantly improved.
A fully-integrated broadband 0.03–1.032THz radiating array is presented. Coherent spatial combining from 8 elements is successfully demonstrated. The combined signal achieves a jitter of 270fsec, a record pulse-width of 5.4psec, and an impulse peak EIRP of 30dBm. Each array element includes a programmable delay with step resolution of 300fsec and dynamic range of 95psec. Frequency-domain measurements...
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