In islam, Minarates are not essential for building mosque, it was introduced by the time there was no amplifiers, to allow the "mu'athen" to reach higher place than all surroundings and to his voice to reach as far as possible. now that technology allowed voice to reach everywhere, minarates become just a traditional shape of mosques.

what swiss are trying to ban is the loud muslims call to prayers in mosques, main reason of banning building of minarates

Yalla!