The invention relates to an electronic apparatus including at least one electronic board provided with an external coupling connector and a radio transmission device comprising at least one antenna tuned to a predetermined frequency, the connector having a metal casing connected to an earth of the electronic apparatus. At least one metal tab is attached to the metal casing of the connector in order to project laterally from the casing so as to attenuate, in the vicinity of the antenna, a spurious electromagnetic field produced by the connector during operation, the tab having a length suitable for resonating at the predetermined frequency.