@jacopocanova you can get those connectors from Mouser.com in Europe as well, [https://www.mouser.com/c/connectors/rf-interconnects/rf-connectors-coaxial-connectors/?q=coax%20%20IPEX%20SMD&product=PCB%20Receptacles|This link] is for the US site but the same mouser part numbers apply for the european stores. Parts are inexpensive but Mouser is expensive shipping so you may want to shop around any of the major electronic parts store. I believe Farnell in the UK carries those as well.