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.

Additional Metadata
Keywords Circuit design and applications, Passive components and circuit
Persistent URL dx.doi.org/10.1017/S1759078713000330
Journal International Journal of Microwave and Wireless Technologies
Citation
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