Open structure log-periodic SIS receivers at 180 and 305 GHz |
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| Authors: | José Antonio López Fernández Thomas Lehnert and François Mattiocco |
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| Institution: | (1) IRAM, Institut de Radioastronomie Millimétrique, 300 Rue de la Piscine, 38406 St. Martin d'Hères, France;(2) Currently at the Centro Astronómico de Yebes, Apartado de Correos 148, E-19080 Guadalajara, Spain |
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| Abstract: | Two open structure heterodyne receivers have been designed and tested at 180 and 305 GHz. The RF signal is coupled via a seven teeth log-periodic planar antenna to the mixer. The beam efficiency of the antenna is 65 %. The coupling efficiency to the fundamental gaussian mode is higher than 90%. The mixer incorporates a series array of two SIS Nb-Al/AlOx-Nb junctions. Photolithographical techniques have been employed to fabricate the antennas and the junctions. Double side band noise receiver temperatures of 95 K at 190 GHz and 160 K at 305 GHz have been measured. |
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| Keywords: | Log-periodic planar antenna Beam efficiency Gaussicity SIS Nb-Al/AlOx-Nb junction |
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