A quasi-optical Schottky receiver based on an integrated planar antenn
a-mixer structure has been developed and tested at 335 GHz. The receiv
er antenna is based on the quasi-integrated horn antenna with 23 dB di
rectivity. At room temperature, the measured DSB antenna-mixer convers
ion loss and noise temperature at 335 GHz are 8.5 dB and 1750K, respec
tively. This simple and tunerless design has a noise figure within 1 d
B of the best tuned room temperature waveguide mixer using a similar p
lanar GaAs Schottky diode [1].