Sharp Kabushiki Kaisha Corporation

Motofumi Yamaguchi

Eiji Suematsu

Mitsuhiro Noboru

Miyoshi Yamauchi

Haruo Suzuki

An earphone antenna device operable to be connected with a wireless communication terminal device includes: earphone cables, connected with earphone sections, respectively, for supplying audio signals; an audio cable one end of which is connected with the wireless communication terminal device and the other end is connected with the earphone cables; and a coaxial cable one end of which is connected with the wireless communication terminal device and the other end is connected with a pair of string-shaped antenna elements integrated with the earphone cables. The earphone cables are insulated from the antenna elements and the audio cable is insulated from the coaxial cable. This provides a dipole antenna device and an earphone antenna device hardly influenced by noises from the wireless communication terminal device and noises transmitted via the audio cable. Further, a wireless communication terminal device to be connected with the antenna devices is provided.

Dipole antenna device, earphone antenna device, and wireless communication terminal device connected to the device

An antenna of the present invention includes a coaxial cable, antenna elements (and), and an unbalanced/balanced converter. The unbalanced/balanced converter has a high-pass circuit provided between an input terminal portand an output terminal portand a low-pass circuit provided between the input terminal portand an output terminal port. Moreover, the high-pass circuit rejects frequencies within a VHF band, and the high-pass circuit and the low-pass circuit both pass frequencies within a UHF band. In response to a signal, inputted to the input terminal port, which falls within the UHF band, the high-pass circuit and the low-pass circuit output signals that are inverted in phase and equal in amplitude with respect to each other. Therefore, the antenna has high transmission and reception sensitivity in a wide frequency range, i.e., in the VHF and UHF bands. This makes it possible to provide an antenna having high transmission and reception sensitivity in a wide frequency range.

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Osaka, Japan

Motofumi Yamaguchi