I have heard of terrifying microwave directed-energy weapons that seem like something right out of 1950s scifi. I won't even joke around because this is so dead serious. This technology was used in Australia once to attack peaceful protesters. It actually hurt them and they didn't hurt anyone!
I think someone should take these matters into their own hands. In publicity photos I have seen computers used to control these machines. And computers are susceptible to EM interference. My idea is using a directional antenna to direct harmless-to-humans EM at those wretched machines to crash the computers. This would take the whole directed energy weapon temporarily off-line.

I have very little background in RF stuff, but I'll tell you what I know.

I think having electromagnetic waves that are harmless to humans but harmful to computers would be difficult in continuous operation, I think the best bet would be an electromagnetic pulse device. I have seen plenty of EMP devices on Youtube, but getting it powerful and directional enough to work at a distance might be an issue. It would also probably affect other innocent computers in the area as well, possibly more so than your target.

Of course doing this yourself would probably be illegal since you are damaging property of others (as well as the government property). And some communications governing agency would probably not allow that due to the amount of power involved, assuming you are unlicensed (just guessing).

Maybe this is possible, but I don't recommend doing it.

I don't think an offensive strategy here is wise. Defence is key here.

You can completely forget trying to disable the computers. Just beaming radio waves at it won't work because modern *professional* electronics are usually well shielded. Especially stuff that literally is sending out radio waves. Look at what people are doing with tesla coils. Those things create MASSIVE field strenghts of RF energy (they are literally based on the technology of 1900s era radio transmitters/spark gap transmitters), yet people's cameras are still running just fine, and midi control boards for musical tesla coils are only occasionally glitching out.

An EMP will take a capacitor bank mounted to a box truck with an enormous coil to induce currents in that machine. Unrealistic, *properly* weapons grade (as in 'you are now not a civillian anymore but you're using military scale power against the government) and there's no way to validate its effect against the devices you want to put out of service until you actually have access to one of those and a plot of aussie outback where you can do those tests. You cannot do those tests without being noticed by the authorities, because the EMPs will propagate like easy to receive radiowaves at a distance.

Now, what can you do? Well, that's fairly simple. Buy a roll of super fine stainless steel, thin, flexible fly screen or filter mesh. Make this into full body coverage garments that you wear over a long sleeve shirt and trousers. Ensure all seams are folded over and stitched together firmly so everything makes electrical contact. Connection between shirt and trousers of the garment should overlap generously.

On the condition that the holes in the screen are smaller than the wavelength of the microwave weapons, this will essentially reduce the power your body absorbs by 100-1000x.

As a bonus, this will also protect fully against stun guns/cattle prods (it'll short them out) and diminish the effect of tazers (the darts will still stick into your skin, but part of the energy will be conducted through the mesh. This does come at the risk of sparking on the skin causing small burns, but that is preferable over being shocked and incapacitated).

Of course i have not validated the effect of protective clothing like this. I am a ham radio operator but generating legal limit power at the frequencies used by those weapons (many GHz) is really hard. And tbh, i'd be scared shitless if i were to concentrate that amount of power on part of my own body, even with a suit that theoretically should protect against it.

It's something i've been thinking about since the rise of authoritarian politics both in my own country and abroad. I actually have a roll of copper plated textile mesh sitting around i bought on Aliexpress and it is indeed actually properly conductive, so plated textiles may also be doable. But i don't know how durable the plating is, whether it won't just wear off after a few hours of wearing, and how much power it can dissipate or reflect before flashing off.