This paper presents the results of a novel miniature single sideband (SSB) subharmonic direct upconverter GaAs MMIC with no DC power consumption and developed in uniplanar technology. The mixer uses 100MHz I and Q signals to directly modulate the second harmonic of a 30GHz carrier, producing the required 60.1GHz RF output. Two pair of antiparallel diodes reduce feed-through of the fundamental 30GHz signal to the RF output while novel coplanar waveguide centre conductor-based structures provide matching. This 2.1mm2 chip also uses a reduced-size Wilkinson divider based on asymmetric coplanar stripline and a standard size CPW 90° coupler. It exhibits a conversion loss of less than 11dB and a high image rejection ratio of greater than 20dB over a wide frequency range from 52GHz to 61GHz.

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Keywords 60GHz ISM band, Asymmetric series stubs, CPW series stubs, millimeter waves, MMIC, subharmonic mixer
Conference 7th European Microwave Integrated Circuits Conference, EuMIC 2012 - Held as Part of 15th European Microwave Week, EuMW 2012
Hettak, K., Ross, T., Irfan, N., Morin, G., Yagoub, M.C.E., & Wight, J. S. (2012). Highly integrated 60GHz SSB MMIC mixer with no DC power consumption based on subharmonic LO and CPW circuits in GaAs pHEMT technology. In European Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 7th European Microwave Integrated Circuits Conference, EuMIC 2012 (pp. 536–539).