Patent ID: 7679577

Claim:
An antenna arrangement provided in a portable communication device, the antenna arrangement comprising: a first set of joined material layers defining a circuit board and ground; a second set of joined material layers comprising an antenna layer that includes all antennas for the device, and a common grounding layer for all the antennas of the antenna layer, where the grounding layer comprises an Artificial Magnetic Conductor (AMC) material structure configured to face the antenna layer, where the antenna layer is divided into different sections, with each section configured for a separate frequency range, where the AMC material structure is divided into sections corresponding to the sections of the antenna layer, where each AMC material structure section facing a corresponding antenna layer section is configured to have a high surface impedance for the frequency range of the corresponding antenna layer section, and where at least one of the AMC material structure sections further comprises at least one island occupying an area that is aligned with and surrounds an antenna in the corresponding antenna layer section, said island being designed to have a high surface impedance for the frequency range of said antenna layer section and being surrounded by AMC material having a high surface impedance for the frequency range of another antenna layer section.