Program and Abstract Book - SRON
Program and Abstract Book - SRON
Program and Abstract Book - SRON
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19 th International Symposium on Space Terahertz Technology<br />
3-7<br />
100 GHz sideb<strong>and</strong> separating mixer with wide IF b<strong>and</strong>:<br />
First results<br />
D. Maier, D. Billon-Pierron, J. Reverdy, <strong>and</strong> M. Schicke<br />
Institut de RadioAstronomie Millimétrique (IRAM)<br />
300, rue de la piscine<br />
38406 St. Martin d’Hères<br />
France<br />
We are reporting on the design of a sideb<strong>and</strong> separating SIS mixer covering the rf<br />
frequency range from 80 to 116 GHz. The mixer consists of a waveguide rf quadrature<br />
hybrid coupler, two DSB mixers <strong>and</strong> an IF hybrid coupler. Rf coupler, LO couplers, LO<br />
splitter <strong>and</strong> mixer blocks have been integrated into one e-plane split-block. The DSB<br />
mixers consist of Nb-Al/AlO x -Nb junctions integrated in Nb tuning structures. Because<br />
of the low capacitance of the mixer chip it works for IF frequencies from 4 to 12 GHz.<br />
Although in the final design the junctions are directly mounted into the integrated<br />
coupler/mixer block without prior testing, mixer blocks have been fabricated to be able to<br />
validate the mixer design by DSB mixer tests. Those tests confirmed that the design<br />
covers both rf <strong>and</strong> IF design frequency b<strong>and</strong>s obtaining good <strong>and</strong> flat noise temperatures.<br />
First 2SB mixer tests showed good noise temperatures <strong>and</strong> image rejections.<br />
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