A Ku/K-band PHEMT Diode Single-balanced Mixer

This paper describes the design and measured performance of a single-balanced mixer using a planar Marchand balun for operation in the microwave and millimeter-wave bands. The MMIC was fabricated on AlGaAs/InGaAs/GaAs pseudomorphic high-electron-mobility transistor (PHEMT) processes with a chip size of 2.11 times 1.54 mm
²
. The best up-conversion loss is 8 dB with an LO-to-RF isolation better than 30 dB