B. Bonte et al., AN AUTOMATED-SYSTEM FOR MEASURING POWER DEVICES IN KA-BAND, IEEE transactions on microwave theory and techniques, 46(1), 1998, pp. 70-75
An active load-pull system is presented for measuring devices from 50-
mu m to 3-mm gatewidth in Ka-band, It can automatically scan the inter
esting area of the Smith chart, The system protects the tested devices
because the impedance is presented at the output of the device only i
f the gate current is lower than a fixed value, Results are presented
at 30 and 38 GHz on a pseudomorphic high electron-mobility transistor
(PM-HEMT).