Does anybody know any good manufacturers of microwave diodes? Specifically, I'm looking for rectification that can be operated at essentially as high of a frequency as I can get. This led me to look for Schottky diodes (anybody have a better suggestion?). So far, all the microwave Schottky diodes I have found use silicon and have a 40 GHz cutoff. However, Sze has a plot (Fig. 37, Ch. 3, 3rd Ed.) that shows GaAs Schottky diodes with cutoff frequencies upwards for 800 GHz! Hell, anybody know where I can get these bad boys?