Passive intermodulation (PIM) is a growing issue in several communication systems, like cellular networks, shipboard systems and satellite communication systems. These intermodulation products are due to the non linear behaviour of passive components in which the signals travel. But, unlike the more known distortions due to active devices, they are more complicated to remove and can lead to problems during the communication. Indeed, these unwanted frequencies can fall within the receiver band, leading to interference problems and reducing the performance of the whole system. Specifi cally, the arise of PIM is related to the non ideal metal-metal (MM) contacts in the system.