USE OF AMC MATERIALS IN RELATION TO ANTENNAS OF A PORTABLE COMMUNICATION DEVICE

摘要

A portable communication device comprises a first set of layers (42) providing different circuits, and a second set of layers (40) comprising an antenna layer (46) including all antennas and a grounding layer for all antennas. The grounding layer comprises an AMC material structure (10) facing the antenna layer. The antennas are grouped according to operational frequency range, where each group covers a separate frequency range. The AMC material structure (10) is also divided into sections, where each section faces a group of antennas and has a high surface impedance for the frequency range of this group. There is also a casing surrounding elements of the device including the antenna and grounding layer, where one side of the casing is provided with a strip of AMC material having a high surface impedance for an operational frequency range of at least one antenna.