Antenna system for a portable device

An antenna system comprising first and second antennas, the second antenna being disposed laterally from the first antenna along a longitudinal axis, and further comprising a first isolation structure disposed between the first and second antennas, the first isolation structure comprising a first resonator element having a first arm with first and second ends, the first arm connected to ground at its first end and extending across the longitudinal axis, and a lateral second arm connected to the second end of the first arm, wherein at least a portion of the first resonator element is disposed adjacent to a portion of the first antenna such that the first resonator element is strongly coupled to the first antenna, wherein the first isolation structure further comprises a second resonator element disposed relative to the first resonator element so as to couple strongly to the first resonator element, and wherein the first and second resonator elements are not directly electrically connected to each other, but are each separately connected to ground, and wherein the second resonator element comprises a lateral elongated element located between the first antenna and the first arm of the first resonator element.