How does a signal jammer work?

Question

mobile connection

Please clarify on the subject of signal jammers.
There was a need to make a jammer for signals in the range of 2.7-2.9 GHz (it is supposed to put direct noise interference in a specific range, those, as I understand it, "hammer the air", and the need to use a directional antenna was discussed, weight-dimensions and power do not matter) .
I understand the general principle at the teapot level, but when I started rummaging through the sites I somehow got lost.
Maybe someone can throw a link to a tutorial, website, video or something like that.
ps I wanted to consider at least some specific options or schemes, or at least understand at a simple level what works and how.
p.s. i would appreciate any help

Answer 1

First you need to distinguish between active and passive. Passive ones simply fill the air with "white" noise. Active ones transmit at the moments of transmission of third-party systems. Hence the different circuitry: in the passive generator and signal amplifier, and in the active, a transceiver with a microcontroller can be used, which transmits only at specific points in time.
Naturally passive are the easiest to implement.