# Rough feasability of 1W of microwave power in a 1mm^3 region at 10GHz?

I understand, from a previous question, that the generation and simulation of near-field microwave electronics is challenging.

Before doing a full simulation, is it possible to get a ballpark estimate for what a reasonable amount of microwave power is possible to generate in a small region (without enhancing it via a cavity)?

For example, what is the rough feasability of 1W of microwave power in a 1mm^3 region at 10GHz? It would be my first time trying something like this, and I want just a quick evaluation of people with more experience if this is a realistic goal.

• What is the meaning of power delivered to a volume of undefined impedance? Would a microstrip transmission line not suffice? Commented Aug 4 at 13:32
• @TimWilliams, perhaps I'll write a new question to explain the details. But the context is: I was origionally considering a microwave cavity at 10GHz, and I wanted to see if I could produce the same field strength for a small region inside the cavity, in an open configuration without a cavity at all. I have a loose understanding that this should be equivalent to about 1W of microwave power in a 1mm^3 region -- but as you say, perhaps my estimate of power is not so clear. Commented Aug 6 at 17:13
• Are you asking specifically about generation, ie. Feed X watts of DC into a cubic millimeter, then some fraction of it comes out as microwaves? Otherwise, what’s the purpose of the word generate? The limitations will be purely thermal, not much to do with RF. It is insanely hard to cool down a cubic mm even if everything around it is metal. The imaginary generator would be fed power via solid copper, and RF would exit via a copper transmission line with minimum of dielectric. Commented Aug 6 at 17:16
• If you’re not generating the RF power, just passing it through dielectric, then 1W/mm^3 is not very much. Plenty of transmission lines do this day in, day out. So, is that what you are asking? You want about 1mm^3 of space, all of it presumably dielectric, right? There can be metal around it. Not even necessarily nearby - the cube can be inside a waveguide that’s pushing kilowatts out. So it looks like your question is sort of trivial, unless you can really explain what you mean. The lack of clarity makes it frustrating. You mean something - just say it, don’t save it for later. Commented Aug 6 at 17:22
• @Kubahasn'tforgottenMonica, well perhaps you can assist me in the correct word choice. Here's another description for clarity: if you imagine, for example, that I already have a microwave source, which is coupled in an SMA cable -- then my goal is to produce a certain field strength such that it corresponds to 1W of disappation of power from a standard SMA cable. Commented Aug 6 at 17:22