Wi fi strength is too weak than other laptop in same distance and same wifi connection

[Yunus SIR]

I have Sony SVE15127CNB laptop running with windows 10. My laptop has less wifi strength than other laptop in same network and same distance. While my laptop shows 2 bars near about 2 meter distance but other laptop like dell,hp which I have in my family shows full strength and if the distance become more than 3 meter the wifi signal gone but at the same time other laptop have shown full or 4 bars . For that reason they can access internet almost everywhere in my home but I cant. I have to sit near the router. I made the the adapter updation , adapter install and reinstall from sony website

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