Or a micro-wireless jammer that’s so weak, it wouldn’t even disrupt anything outside of what it’s built into.
Even if you can’t block the outgoing signal, you’ll disrupt the incoming signal and prevent any kind of handshake from happening.
Wrap it in aluminum foil as a Faraday cage?
That's not a practical solution for a car.
Basically, the problem is the car's electronics have a cellular modem component, but I want everything besides that to continue to function and receive other radio signals. I can disconnect the antenna plug, but my understanding is that will just make the reception worse but not eliminate it.
I'm wondering if there's something simple and safe that would basically act as an anti-antenna, and absorb or interfere with any signals the rest of the electronics manage to pick up or transmit. I don't know much about electronics, but I was thinking maybe some kind of passive component, like a capacitor or resistor, might be able to soak up any residual signal.
Wouldn't such a thing require an antenna that you could remove or disable to function?
Speaking of... is there a more effective way to disable a cellular modem than removing its antenna? Like some kind of component that you could replace the antenna with that would mitigate any residual antenna-function of the remaining wiring? I want to do this to the modem on my car.