Mitsubishi Denki Kabushiki Kaisha

Yasuhito Imanishi

Hideaki Shoji

Toru Fukasawa

Hiroyuki Ohmine

Tetsuya Tanaka

Hirokazu Taketomi

Yasuhiro Nishioka

Takatoshi Katsura

Yoshinori Matsunami

Shigeru Makino

Yonehiko Sunahara

Eriko Komori

A mobile phone includes a lower housing having one and and the other end, an upper housing having one end pivotally connected to the lower housing, and an antenna accommodated close to one end of the lower housing. The other end of the upper housing pivots toward and away from the other end of the lower housing. The mobile phone is used in close proximity to a user's head with the other end of the upper housing being distanced from the other end of the lower housing. Upon use, the lower housing is disposed relative to the upper housing so that the upper housing intervenes between the antenna and the user's head.

Mobile terminal including first and second housings and an antenna

In a foldable portable telephone, a shield box provided within an upper casing is connected via a flexible cable to an output terminal of a transmitting circuit provided within a lower casing, and the shield box is used as an antenna. Thus, compared to the conventional case where a rod antenna is provided at an upper end of the lower casing, variation in gain dependent on a state of the user's hand holding the portable telephone is lessened.

Foldable portable telephone

A mobile phone includes a lower housing having one end and the other end, an upper housing having one end pivotally connected to the lower housing, and an antenna accommodated close to one end of the lower housing. The other end of the upper housing pivots toward and away from the other end of the lower housing. The mobile phone is used in close proximity to a user's head with the other end of the upper housing being distanced from the other end of the lower housing. Upon use, the lower housing is disposed relative to the upper housing so that the upper housing intervenes between the antenna and the user's head.

An antenna device, a radio communication terminal, an external antenna, and a hand strap can be provided, which are capable of ensuring satisfactory communication performance without being affected by the surrounding environment even in an area where the electric field is weak, and having the antenna performance improved by slightly modifying the body of an existing radio communication device. The antenna device according to the present invention includes an internal antenna () electrically connected to and incorporated into a circuit for radio communication within a case () and an external antenna () externally attached to the case.

Antenna device, wireless communication terminal, external antenna and hand-strap

The antenna device includes a linear antenna ( ), a fixing member ( ), and a power feed member ( ). The fixing member ( ) is formed from a dielectric, and holds a portion ( ) of the antenna. The power feed member ( ) contacts the antenna ( ). The fixing member ( ) holds the antenna ( ) in a movable manner.

Antenna device and portable device

An antenna device includes: a conductive board ( ) having one end portion and the other end portion opposite the one end portion; a flat plate antenna( ) mounted on the board ( ) with a dielectric interposing therebetween wherein when feeding a current thereto to excite, a current also flows in said board ( ); a first current direction change means ( ) changing a direction of the current flowing in the board ( ) to a first direction when exciting the antenna ( ) and located on said one end portion of the board ( ); and a second current direction change means ( ) changing a direction of the current flowing in the board ( ) to a second direction different from the first direction when exciting said antenna ( ) and located on the other end portion of the board ( ).

Antenna device and portable machine

A portable telephone including a main unit case and an antenna element. The antenna element includes a meander line antenna as the first antenna unit arranged within the main unit case and formed to extend in one direction, and a second antenna unit extending substantially orthogonal to the extending direction of the meander line antenna, and arranged projectable from the main unit case, having an electrical length of approximately (&lgr;/2)&times;A (A is an integer), and coupled to the meander line antenna.

Antenna element and portable information terminal

An antenna device ( ) includes a substrate ( ) and an antenna ( ) provided on the substrate ( ) and having an electrical length of (&lgr;/2)&times;A (A is an integer). The antenna ( ) includes a plate antenna ( ) positioned at a portion where an electrical length from an end portion ( ) is approximately &lgr;/4&plus;(&lgr;/2)&times;B (B is an integer), and a meander line antenna ( ) connected to the plate antenna ( ).

Antenna device and portable terminal

An antenna element includes a plate antenna which is substantially equivalent to a series resonant circuit, and a monopole antenna which is connected to the plate antenna and is substantially equivalent to a parallel resonant circuit.

A portable telephone includes a metal substrate, a shield box, a monopole antenna and a feed unit. The surface of the metal substrate includes a conductive metal layer. The shield box covers a radio transmitter-receiver unit provided on the metal substrate to electromagnetically shield the radio transmitter-receiver unit, and has conductivity. The monopole antenna extends in a predetermined direction, and has an electrical length of (&lgr;/2)&times;N (N is an integer). The feed unit is provided at the metal substrate so as to be apart from the shield box in the extending direction of the monopole antenna. The feed unit includes a matching circuit.

Portable wireless terminal

A slide lever ( ) is provided to a cabinet ( ) of portable radio equipment, and an antenna ( ) formed by nickel elastic alloy is held by a holding member ( ). A lower portion of the antenna engages with an engaging portion ( ) of slide lever ( ), and by sliding slide lever ( ), the lower portion of antenna ( ) is bent at engaging portion ( ) such that the entire antenna is inclined in a vertical direction by a desired angle, thereby reducing loss due to nonconformity of polarization with respect to an antenna of a base station.

Antenna structure of portable radio

High gain antenna equipment is provided by improving gain with optimal impedance matching with an antenna element in a stored state as well as in an extended state. The antenna equipment is provided with a radio communication device housed in a case, a pullout type antenna element, a coil acting as a matching circuit element in an extended state of the antenna element and as a helical antenna in a stored state, and a switch connected to the coil at one end which is brought into contact at the other end with a ground terminal when the antenna element is in an extended state and which is brought into contact with an open terminal when the antenna element is in a stored state.

Switched retractable, extendable, dual antennas for portable radio

An antenna equipment employing a chip inductor based antenna includes a multilayered miniaturized chip inductance element having an approximately .lambda./4 wavelength which achieves a half-wave dipole antenna performance together with a ground having an approximately .lambda./4 wavelength. In a preferred embodiment, the inductance element is formed of a plurality of thin sheets of insulating material carrying conductor segments which are connected through via-holes in the sheets to form a spiral inductance element within the stack of sheets. Direct connection avoids impedance matching circuit insertion loss and low-cost miniaturization with reduced antenna gain deterioration from surrounding conductors is provided for an effective miniature portable radio communication apparatus.

Antenna for a radio communication apparatus

A radio frequency transceiver apparatus for changing over between a whip antenna and an internal antenna, wherein the whip antenna itself is utilized as both an antenna change-over element and an antenna change-over line, thereby permitting the antenna change-over in a simple construction and permitting the reduction of insertion loss, with little deterioration of VSWR.

Growing community of inventors

Hyogo, Japan

Yasuhito Imanishi