Aternative diode classes for high frequency(10GHz) applications
Diodes for 10 GHz are very much in the "microwave" part of electronics, you will probably not find any suitable diodes at Farnell, Digikey etc.

You might have a better chance at "microwave" companies like Skyworks, Tryquint, Avago and Minicircuits.

To get you going this article might be interesting.

I am unsure if you will find any discrete diode for your application, in the microwave world it is usually integrated in some small metal box. This is because you need properly matched transmission lines to the diodes.