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.

Additional Metadata
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
Citation
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).