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International Journal of Infrared and Millimeter Waves

A 385–500 GHz Sideband-Separating (2SB) SIS Mixer Based on a Waveguide Split-Block Coupler

Mamoru Kamikura, Yu Tomimura, Yutaro Sekímoto, Shin’ichiro Asayama, Wenlei Shan, Naohisa Satou, Yoshizou Iizuka, Tetsuya Ito, Toshiaki Kamba, Yasutaka Serizawa, Takashi Noguchi

Published Sep 17, 2007• 13 citations
Publisher
DOI
10.1007/s10762-007-9280-2

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We present the results of the development and characterization of the sideband separating (2SB) SIS mixer for the APEX band 1, 211-275 GHz.All mixer components, except the IF hybrid, are integrated into a single mixer block. The sideband separation is achieved by using a quadrature scheme where a local oscillator (LO) pumps two identical SIS mixers. The RF power is divided using a waveguide branch line coupler and directed with 900 phase difference to the ends of the substrate, where each path is coupled to the mixer chip through a waveguide to microstrip transition. Preliminary tests of this 2SB mixer show a sideband suppression ratio of about 12 dB and a typical SSB noise temperature of 80K.

Softwaretechnik-Trends•May 1, 2006•0 citations
We present the results of the development and characterization of the sideband separating (2SB) SIS mixer for the APEX band 1, 211-275 GHz.All mixer components, except the IF hybrid, are integrated into a single mixer block. The sideband separation is achieved by using a quadrature scheme where a local oscillator (LO) pumps two identical SIS mixers. The RF power is divided using a waveguide branch line coupler and directed with 900 phase difference to the ends of the substrate, where each path is coupled to the mixer chip through a waveguide to microstrip transition. Preliminary tests of this 2SB mixer show a sideband suppression ratio of about 12 dB and a typical SSB noise temperature of 80K.