Sharp Kabushiki Kaisha Corporation

Mitsuhiro Noboru

Miyoshi Yamauchi

Syuuji Matsuura

Haruo Koizumi

Toshifumi Akiyama

Eiji Suematsu

Hiroshi Isoda

Shinji Amano

Motofumi Yamaguchi

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

Dispersing directions of oscillation frequency variable ranges of all voltage controlled oscillators provided in an integrated circuit are uniformed, and not only a range covering a frequency regardless of whether a dispersion occurs or not, but also a range covering the frequency only in a case where the dispersion occurs is used as the frequency variable range of the voltage controlled oscillator, and the frequency variable ranges of the voltage controlled oscillators are set so as to be successive with respect to each other, so that a small number of voltage controlled oscillators can cover a wide frequency variable range. Thus, the integrated circuit having voltage controlled oscillators therein is miniaturized.

Integrated circuit and receiving device

The tuner structure of the present invention includes: a circuit board on which electronic circuit components such as transistors and resistors have been mounted; a chassis angle; and a shield cover. In the tuner structure, a feedthrough capacitor for inputting/outputting a power, a control signal and the like is mounted to a metal plate disposed in parallel to the circuit board.

Tuner structure and cable modem tuner using the same

An outdoor unit low noise converter for satellite broadcast reception use and 2-band low noise converter (LNB: Low Noise Block Downconverter), the so-called 2-band LNB for receiving two frequency bands. The low noise converter is capable of receiving a plurality of bands in one converter. The 2-band LNB has terminals as many as those of the LNB of one band by placing of power supply voltages upon the IF output.

Outdoor unit low noise converter for satellite broadcast reception use

A multiple-band mixer circuit includes at least two mixer circuit blocks, a selection circuit block for selecting one of the mixer circuit blocks, and a monitor circuit provided for common use by the at least two mixer circuit blocks, for monitoring the operation state of a mixer circuit block selected by the selection circuit block.

Multiple-band mixer circuit

A two-band low noise frequency converter coupled, for example, to RF signals from a satellite and receiving at least two frequency bands therefrom including relay switch means for switching from one frequency band to another and control means which is responsive to the low level of a bi-level power-supply voltage being fed through an IF output terminal to operate the switch means. This reduces the power consumption and the heat generated thereby.

Growing community of inventors

Tondabayashi, Japan

Mitsuhiro Noboru