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  • 1
    Publication Date: 2013-08-31
    Description: A new type of frequency multiplier structure is being developed which is suitable for application at frequencies above 1 THz. This structure preserves some of the properties of waveguide for mode control, yet is not truly single mode. The device resembles a sectoral horn, with a varactor diode mounted near the throat. Input and output coupling are through the same aperture, requiring a quasi-optical diplexer. Initial tests are directed at building a tripler at 500 GHz, for comparison with waveguide structures. The diplexer is a blazed diffraction grating with appropriate focusing optics. Model studies show that the impedance match to a varactor should be good, and initial tests of the beam patterns of the prototype indicate that optical coupling efficiency should be very high. The structure also has the potential for use as a fundamental mixer, or as a third harmonic mixer.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Michigan Univ., The Third International Symposium on Space Terahertz Technology: Symposium Proceedings; p 181-188
    Format: application/pdf
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  • 2
    Publication Date: 2019-07-13
    Description: The U.S. design concept for the Square Kilometre Array (SKA) program is based on utilizing a large number of small-diameter dish antennas in the 12 to 15 meter diameter range. The Technology Development Project (TDP) is planning to design and build the first of these antennas to provide a demonstration of the technology and a solid base on which to estimate costs. The latest considerations for selecting both the optics and feed design are presented.
    Keywords: Communications and Radar
    Type: IEEEAC Paper 1597 , Aerospace Conference, 2011 IEEE; Mar 05, 2011 - Mar 12, 2011; Big Sky, MT; United States|Aerospace Conference Proceedings, 2011 IEEE; 1-10
    Format: text
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