an antenna device for a mobile phone is disclosed , wherein a distance between a miniaturized radiator and a miniaturized reflector may be shortened by means of an introduced dielectric material optimizing the electrical distance between the radiator and reflector to create a compact antenna unit having a desired cardioid shaped radiation pattern . furthermore an additional field reducing means in the form of metallic strips is used , for example utilizing an additional dielectric layer , with at least two thin isolated metallic strips running parallel to the current edges of the reflector element to thereby form chokes at the back of the reflector , which is normally directed towards the user , to further concentrate the near - field on this side to an area in between the chokes .