Patent ID: 7446716

Claim:
An electronic device including a flat display unit having a thickness and a dipole antenna for communication with an external device; comprising: the display unit including a conductive portion formed in a rectangular or substantially rectangular shape, the conductive portion having a main surface parallel to a display screen of the display unit and a lateral portion positioned at a lateral edge of the main surface; wherein in a case where a plane containing a main part of radiating conductors of the dipole antenna is called an antenna surface, when it is assumed that there is an imaginary straight line m 1 , which extends in a direction perpendicular to a longitudinal direction of the dipole antenna, passes through a center of the dipole antenna in the longitudinal direction and is parallel to the antenna surface, the dipole antenna is disposed on the lateral portion or in the vicinity of the lateral portion of the display unit so that the imaginary straight line m 1 is parallel or substantially parallel to the display screen of the display unit, is parallel or substantially parallel to an upper side or a lower side of the main surface of the conductive portion and passes through the lateral portion of the conductive portion or has contact with the lateral portion; the electronic device having a function of communicating with the external device through the dipole antenna; wherein when the dipole antenna has a length L A in the longitudinal direction thereof, when the conductive portion has a thickness T, and when a radio wave for communication with the external device has a wavelength λ 0 in the air, the formula of λ 0 ≧L A ≧T is established; and at least one of the four sides forming the rectangular or substantially rectangular shape of the conductive portion having a greater length than the wavelength λ 0 ; wherein when the formula of L A =(λ 0 /2) or L A ≅(λ 0 /2) is established, a shortest distance d between each of the peripheral portions of the radiating conductors and the lateral portion of the conductive portion ranges from (λ 0 /20) to 3λ 0 ; and wherein when the formula of L A ≠(λ 0 /2) is established or when the formula of L A ≅(λ 0 /2) is not established, the shortest distance range from (L A /10) to 6L A .