Thank you, Alan. It is possible to use multiplier circuits and tune to the harmonics. I have actually done that to 1.2 GHz. The components are actually etched on copper clad. (Plenty of trial and lots of error) It requires more components and design effort to get to the waveguide. The beauty of the GUNN Diode is that it can be placed right into the cavity resonator and directly connected to a horn. The GaN GUNN is a better choice because it can operate at even shorter wavelengths and higher power. Both, of course require sinking. I have not found a supplier and the only devices I am familiar with were developed in the lab. But I seem to get a lot of hits as to technical information on the internet. So I thought to ask on the List because there is a very diverse group here. ----- Original Message ----- From: "Alan B. Pearce" To: "Microcontroller discussion list - Public." Sent: Monday, April 30, 2007 11:03 AM Subject: Re: [EE] GUNN Diodes > >Actually I am looking for components above 40 GHz and even >>above 100 GHz. I also need to get into the T-ray band. >>GaN devices can achieve this but I do not know of anyone >>producing them commercially. > > My understanding from the guys around here that were playing with > Terahertz > stuff, was that they were generating the necessary frequencies by > frequency > multiplying from a lower frequency that they could generate.. > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist