The HMC204 is a passive miniature frequency doubler in a MMIC die. Suppression of undesired fundamental and higher order harmonics is 40 to 60 dB with respect to input signal level and 24 to 42 dB with respect to the output level. The doubler utilizes the same GaAs Schottky diode/balun technology found in Hittite MMIC mixers. It features small size no DC bias, and no measurable additive phase noise onto the multiplied signal. Applications include commercial microwave radios and VSAT, as well as military ECM and communication systems.