Abstract: A hearing aid includes: a signal processor for processing a first audio signal into a second audio signal compensating a hearing loss of a user of the hearing aid; a receiver that is coupled to an output of the signal processor for converting the second audio signal into an output sound signal; and a transceiver for wireless data communication, wherein the transceiver is connected with an antenna for electromagnetic field emission and electromagnetic field reception; wherein the antenna comprises an electrically conductive material, and a slot provided in the electrically conductive material, the slot extending in a plane being substantially orthogonal with an ear to ear axis of the user when the hearing aid is worn in its operational position by the user, the antenna with the slot being configured to emit an electromagnetic field upon excitation of the antenna.

Abstract: An antenna device includes a first antenna configured to operate within a first frequency band, a second antenna configured to operate within a second frequency band, wherein the second antenna is separated from the first antenna by a distance, and at least one parasitic antenna element, wherein the at least one parasitic element is substantially orthogonal to the first antenna, to the second antenna, or to both the first and second antennas, so as to substantially isolate between the first antenna and the second antenna.