An electronic device comprising: an antenna radiator (400; 500; 600; 700; 800; 900; 1000) formed in an open loop shape having at least one opening end part (401; 501; 601; 701; 801; 901; 1001) said open loop shaped antenna radiator having a slit, at least a portion of the at least one opening end part (401; 501; 601; 701; 801; 901; 1001) being connected to a supply part (410; 510; 610; 710; 810; 910; 1010); at least one electronic component (420; 520; 620; 720; 820; 920; 1020) formed of metal material being electrically connected with the antenna radiator (400; 500; 600; 700; 800; 900; 1000); and at least one metal member (430; 530; 630; 730; 830; 930; 1030) being arranged around the antenna radiator (400; 500; 600; 700; 800; 900; 1000), wherein the antenna radiator (400; 500; 600; 700; 800; 900; 1000) is arranged such that it induces resonance at the at least one opening end part (401; 501; 601; 701; 801; 901; 1001) to produce radiation in a direction reverse to the direction from the opening end part (401; 501; 601; 701; 801; 901; 1001) to the metal member (430; 530; 630; 730; 830; 930; 1030); wherein the open loop shape is formed by first, second, third and fourth strips such that the first strip and the second strip extend in a first direction and are opposite to each other, the first strip and the second strip are connected by the third strip at one of their ends, the third strip is longer than the first and the second strip, the third strip extends in a second direction perpendicular to the first direction, the fourth strip extends in the second direction and is located opposite to the third strip and connected to the second strip, the electronic component (420; 520; 620; 720; 820; 920; 1020) being placed at the first strip, wherein the slit (402; 502; 602; 702; 802; 902; 1002) is surrounded and defined by the strips and is formed partially in the same direction as the third and fourth strips with a slit portion between non-connected end parts of the first strip and the fourth strip, wherein the opening end part (401; 501; 601; 701; 801; 901; 1001) is formed on the fourth strip to direct radiation in the direction of the electronic component (420; 520; 620; 720; 820; 920; 1020). an antenna radiator (400; 500; 600; 700; 800; 900; 1000) formed in an open loop shape having at least one opening end part (401; 501; 601; 701; 801; 901; 1001) said open loop shaped antenna radiator having a slit, at least a portion of the at least one opening end part (401; 501; 601; 701; 801; 901; 1001) being connected to a supply part (410; 510; 610; 710; 810; 910; 1010); at least one electronic component (420; 520; 620; 720; 820; 920; 1020) formed of metal material being electrically connected with the antenna radiator (400; 500; 600; 700; 800; 900; 1000); and at least one metal member (430; 530; 630; 730; 830; 930; 1030) being arranged around the antenna radiator (400; 500; 600; 700; 800; 900; 1000), wherein the antenna radiator (400; 500; 600; 700; 800; 900; 1000) is arranged such that it induces resonance at the at least one opening end part (401; 501; 601; 701; 801; 901; 1001) to produce radiation in a direction reverse to the direction from the opening end part (401; 501; 601; 701; 801; 901; 1001) to the metal member (430; 530; 630; 730; 830; 930; 1030); wherein the open loop shape is formed by first, second, third and fourth strips such that the first strip and the second strip extend in a first direction and are opposite to each other, the first strip and the second strip are connected by the third strip at one of their ends, the third strip is longer than the first and the second strip, the third strip extends in a second direction perpendicular to the first direction, the fourth strip extends in the second direction and is located opposite to the third strip and connected to the second strip, the electronic component (420; 520; 620; 720; 820; 920; 1020) being placed at the first strip, wherein the slit (402; 502; 602; 702; 802; 902; 1002) is surrounded and defined by the strips and is formed partially in the same direction as the third and fourth strips with a slit portion between non-connected end parts of the first strip and the fourth strip, wherein the opening end part (401; 501; 601; 701; 801; 901; 1001) is formed on the fourth strip to direct radiation in the direction of the electronic component (420; 520; 620; 720; 820; 920; 1020).