Rectifying diode for frequency of 2.5GHZ 2

Reverse recovery time (Trr) is a spec that is usually used on lower frequency diodes. When you use diodes at RF frequencies, you are usually more concerned with capacitance (Ct) as this directly determines how fast the diode is (along with other pasitic capacitances and lead/package inductances that may not be specifically listed and instead are buried in the spice model).

Note that the HP5082-2080 has a capacitance of 1.0 pF. I would look for RF Schottky diodes with a junction capacitance equal or less than this. Instead of an axial leaded part like the HP diode, look for a small surface mount package to keep the package related parasitics low. Also check that the diode is advertised as a "RF" and is usable up to some high GHz frequency.

You indicate you are building a "current rectifier". Are you trying to build a RF detector of some type?

Thanks Comcokid and biff44, you really helped me hence I am not an electronic engineer (I am a first degree physicist working mainly on mechanical design).
As for your question Comcokid I am afraid I can't answer specifically due to an NDA I am signed on, but the rectifier required is actually used for some kind of detector and therefor the rectification efficiancy is not an issue in this case.
Thanks again.

Lior