MacBook Pro doesn't find my WLAN!

Hi, my MacBook Pro doesn't find my WLAN anylonger. It worked before, but now it just doesn't find it. And I didn't change any settings. It can locate other WLAN Routers in the vicinity though but not mine (HITRON CVE-30360). This is strange because my WLAN-Router is recognized by both, my iPad and my iPhone, and works just fine with these vices. I resetted the router, but nothing changed. Kindly request advice.