Tokin Corporation

Nec Corporation

Kazuo Minegishi

Shinichi Otomo

Shigeyoshi Yoshida

Masashi Ikeda

Ryo Ito

Kenji Takamoro

Makoto Teshima

Shigekazu Ishikawa

Fumihiro Suzuki

In an antenna for use in a mobile communication apparatus and having a helical antenna element ( ) of a helical shape, the helical antenna element is mounted on a flexible substrate ( ) rounded to form a cylindrical shape. The helical antenna element has a plurality of oblique conductive patterns ( ) extending along the flexible substrate and electrically connected to one another at their terminal ends to form the helical shape. The oblique conductive patterns have a similar pitch therebetween.

Antenna having a helical antenna element extending along a cylindrical flexible substrate

In an antenna assembly (,) including a whip antenna (,) provided with a stopper (,) of a conductive material at a lower end of the whip antenna, a helical antenna (,) provided with a conductive sleeve (,) mounted on a top end of the whip antenna, and a holder (,) of a conductive material for slidably holding the whip antenna, each of the stopper, the conductive sleeve, and the holder is of a light metal having a specific gravity not greater than 3 g/cm,. The holder is electrically connected to the stopper when the whip antenna is in an extended position. The holder is electrically connected to the conductive sleeve when the whip antenna is in a retracted position. The light metal may includes at least one of aluminum and magnesium. Alternatively, the light metal essentially consists of 0.4% or less Si, 0.7% or less Fe, 5.0-6.0% Cu, 0.30% or less Zn, 0.2-0.6% Bi, 0.2-0.6% Pb, and the balance Al in weight.

Lightweight antenna assembly comprising a whip antenna and a helical antenna mounted on a top end of the whip antenna

In a multi-band antenna (10) being provided with an antenna element having an LC parallel resonance circuit (3) and a first and a second radiation element (1,2) connected to opposite ends of the LC parallel resonance circuit, the LC parallel resonance circuit is constituted by self-resonance of an inductor itself. A telescopic whip antenna may be constituted by combining a small-size antenna and a whip antenna which is receivable in a radio device casing and expandable.

Multi-band antenna suitable for use in a mobile radio device

An antenna assembly (30) includes a whip antenna (11) and an antenna top (12) has a helical antenna (18) and mounted on a top end of the whip antenna. The antenna assembly is slidably mounted on a cellular telephone set (20) and movable between an extended position and a retracted position. The antenna assembly is further provided with a conductor sleeve (32) connected to the helical antenna. In the retracted position, the helical antenna is brought into electrical connected to an electrical circuitry in the telephone set through the conductor sleeve. The conductor sleeve is rotatably mounted but prevented from axial movement on a dielectric joint member (31) fixed on the top end of the whip antenna, but is fixed to the antenna top so that the antenna top is rotatably mounted on the joint member. The antenna top is mounted on the joint member but freely rotated on the joint member.

Antenna assembly comprising whip antenna and helical antenna contained

A multiband antenna comprises an antenna device which is resonant at two or more different frequencies. The antenna device comprises a first antenna rod (7), a second antenna rod (8), and a distributed-constant dielectric resonator which is a coaxial dielectric resonator (1A) comprising a dielectric block (1A1). The first antenna rod (7) is electrically connected to an inner conductor (4) covering the inner surface of the dielectric block (1A1). The second antenna rod (8) is electrically connected to an outer conductor (5) covering an outer periphery of the dielectric block (1A1). In another structure, the dielectric resonator is a triplate dielectric resonator (1B) comprising two dielectric plates (1B1). The first antenna rod (7) is electrically connected to a center conductor (6) interposed between the dielectric plates (1B1). The second antenna rod (8) is electrically connected to outer conductors (5) covering the dielectric plates (1B1) at the side opposite to the center conductor (6).

Growing community of inventors

Sendai, Japan

Kazuo Minegishi