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It is just an example and the antenna dimensions are not fixed. My aim is to learn how to simulation a fixed pcb+this kind of antenna but I don't know how to ameliorate the S11 because I can't add a matching components in simlation

The ground plane is fixed by the PCB shape, I can't modify it

Thanks a lot for the link and your reply For tha simulation of helical antenna connected to a pcb https://www.google.fr/search?q=helical+antenna&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj1zLmi6NXTAhUJ2RoKHZ56AB4Q_AUICigB&biw=1600&bih=794#imgrc=Hv5lHJHUmWxyWM: How we can adjust the imput impedance??

In simulations??

Hello For an inverted F antenna, I know that we can modify the distance beteween the feeding line and the grounded one to modify une input impedance of the antenne and ameliorate S11. How we can do the same thing for a monopole antenna?? how we can ameliorate the S11?? Thank you