Samsung Galaxy Note 2 (N7100) — Wifi range is very very very poor

Address:

Thiruvananthapuram, Kerala

I am facing a problem about wifi in my note 2. I need to go very near to router if i want to connect wifi... If i turn on wifi hot spot from this note 2, then other devices will get not more than 2 bars of wifi signal even i keep this phone ever other divice...i am really angry about this problem...