Easiest way to think about it is that radar and all radio/microwave communications are light.. they are light beyond what we can but it is light none the less. There is little to no radio/microwave light in the atmosphere naturally (there is natural radio but its very weak/dim). This light needs a special eye to see it and can be broadcast by the same eye in most cases.. this is the antenna/tower/dish. At the ELI5 level what is happening is that they flash the light and look for images in what is bouncing off of it for radar.. and for communications its like a pattern of blinking light and using light of different colors to send messages.
Jammers work by blasting the area with a brighter light.. so bright that you cant see anything else. Patterns of light/light color that overwhelm the “eyes” (antenna/tower/dish). You blast light to the point that any other light in the area cannot be distinguished. Kinda like looking with a flashlight in the dark and then someone turns on a super powerful strobe light. Your eyes are blinded by the flash and keep changing to fast for your eyes to adapt and see what your flashlight was lighting up.
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