Answered
How to get this beacon effect in after effect?
https://www.lottiefiles.com/113-muzli-beacon -> beacon effect sample
https://www.lottiefiles.com/113-muzli-beacon -> beacon effect sample
Create a circle shape layer, then duplicate it.
Keyframe-animate the scale and opacity values (you probably want to use the ease-in keyframe type)
Duplicate the animated layer, and offset the timing of the keyframes.
Then you can pre-compose and loop the animation as required.
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