This paper presents a novel, compact, single-sideband (SSB) subharmonically-pumped (SHP) direct upconverter developed in a uniplanar 0.18 μm GaAs technology. A total of 100 MHz in-phase and quadrature signals directly modulate the second harmonic of a 30 GHz carrier signal, producing a 60.1 GHz output. Two pairs of antiparallel diodes reduce feed-through of the 30 GHz local oscillator (LO) signal to the mixer's RF output. Novel structures patterned in the center conductor of a coplanar waveguide (CPW) provide matching and size-reduction simultaneously. The 2.1mm2 circuit also uses a miniaturized Wilkinson divider based on asymmetric coplanar stripline and a standard CPW 90° coupler. The SSB SHP direct upconverter exhibits a conversion loss of 10 dB, a lower-sideband rejection of 15 dB and 2fLO suppression of approximately 25 dB over a wide frequency range from 52-61 GHz.

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Keywords Circuit design and applications, Passive components and circuit
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Journal International Journal of Microwave and Wireless Technologies
Hettak, K. (Khelifa), Ross, T.N. (Tyler N.), Irfan, N. (Nazish), Cormier, G. (Gabriel), Yagoub, M.C.E. (Mustapha C. E.), Morin, G.A. (Gilbert A.), & Wight, J. S. (2013). Miniature single-sideband subharmonically-pumped 60 GHz direct upconverter in a uniplanar GaAs pHEMT technology using inductive and capacitive loading techniques. In International Journal of Microwave and Wireless Technologies (Vol. 5, pp. 319–328). doi:10.1017/S1759078713000330