Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Olympus Medical Systems Corporation

Naoki Yuda

Toshio Ishizaki

Toru Yamada

Yuki Satoh

Hiroshi Kushitani

Hiroshi Takahashi

Susumu Fukushima

Hideaki Nakakubo

Makoto Fujikawa

Shoichi Kitazawa

Yoshitaka Nagatomi

Koji Hashimoto

Koichi Ogawa

Hidenori Katsumura

Toru Sakuragawa

Akihiko Iguchi

Tsutomu Matsumura

Tomoaki Ieda

Takayoshi Ishikawa

Masaaki Yamabayashi

Thuyoshi Himori

Hiroyuki Nakamura

Hiroaki Kosugi

Tetsuya Tsurunari

Akira Fujishima

Masatoshi Homan

Suzushi Kimura

Kazunari Nishihara

Kozo Murakami

Ryouichi Takayama

Masahiro Hiraka

Tsutomu Inuzuka

Ryuichi Saito

Eiji Okada

Kimio Aizawa

Youichi Morinaga

Yasuteru Asakawa

Atsushi Sasaki

Yoshikuni Fujihashi

Nobuo Sashinaka

Ikuo Ota

Hideki Nanba

Ikuo Ohta

Misako Sakae

Masahiro Oohara

Shigeo Hurukawa

Yasuhiro Otomo

Tooru Sakuragawa

An oscillator device includes a resonator including a coil and a capacitor connected to the coil in parallel; and an oscillator connected to the resonator. Electric waves are emitted from the coil to at least one receiving antenna of the receiver while the oscillator device changes position and direction over time. The coil has an outer diameter and a total length which is approximately the same as the outer diameter.

Oscillator device and transmitter module using same

A composite duplexer includes an antenna terminal, a first receiving terminal, a second receiving terminal, a transmitting terminal, a first switch, a duplexer, and a second switch. The first switch includes a first branch contact, a second branch contact connected with the transmitting terminal, a third branch contact connected with the second receiving terminal, and a first common contact connected with the first antenna terminal. The first common contact of the first switch is connected selectively with the first branch contact, the second branch contact, and the third branch contact. The first duplexer includes a first receiving filter connected with the first receiving terminal, and a first transmitting filter. The duplexer is connected with the first branch contact of the first switch. The second switch is operable to connect and disconnect electrically between the first transmitting filter of the first duplexer and the transmitting terminal. This composite duplexer can separate signals even if their frequency bands are close to each other.

Composite duplexer

A substrate on which cavities having floors and steps is provided. End faces of a light-emitting device, an optical component, and an optical transmission line are abutted on one of the cavity for positioning, and end faces of a light-receiving device, an optical component, and an optical transmission line are also abutted on the other cavity for positioning. Integrated alignment of optical axes facilitates alignment of optical axes, and thus eliminates the need of a CAN package. Accordingly, the size and height of an optical communications module can be reduced.

Optical communications module and substrate for the same

An antenna capable of attaining the miniaturization thereof and the widening of a band in use, and an electronic device containing this antenna therein, having a miniaturized structure and adaptable to a wide band. This antenna is provided with a feeding element having a feeder end, an antenna core provided with the feeding element on an outer circumference thereof, a feeder lead connected to the feeder end, and a magnetic member covering the feeder end. This electronic device is provided with the antenna, a transmission system, and a reception system, and the feeder lead of the antenna is connected to at least one of the transmission system and reception system.

Antenna and electronic device using the same

The present invention relates to an antenna equipped in a mobile telecommunication apparatus such as a portable telephone. The object of the invention is to enhance the portability and the durability of the mobile telecommunication apparatus, to provide a mobile telecommunication antenna while is improved in the mass productivity and the electrical characteristics, and to provide a mobile telecommunication apparatus employing the antenna. To achieve the object of the present invention, the mobile communication apparatus has no projecting portion of the antenna provided on a case, and the antenna is accommodated in the case. This enhances both the portability and the durability. Also, the antenna is reduced to a chip size thus improving its mass-productivity and electrical characteristics.

Mobile telecommunication antenna and mobile telecommunication apparatus using the same

Mobile communication antenna and mobile communication apparatus using it

A small antenna device having a wide frequency band suitable for being built in mobile communications apparatuses. This antenna device includes a planar radiating element (radiating plate) and a grounding plate provided in parallel to and facing the radiating plate. A feeding line is disposed at approximately the end center of the radiating plate, and supplies high-frequency signals. A shorting portion shorts the radiating plate and grounding plate at near the feeding line. A slit is provided at an end face of the radiating plate approximately opposing the feeding line to form two resonators. A coupling level between two resonators is optimized by adjusting the shape or dimensions of this slit, or loading a reactance element or conductive plate on this slit. Accordingly, a small and short antenna with a preferred characteristic is achieved.

Antenna device

The present matching circuit chip has an integrated shape comprising a first transmission line, a second transmission line and a third transmission line, wherein one end of the first transmission line, one end of the second transmission line and one end of the third transmission line are connected to one another, a first filter connection terminal is connected to the other end of the first transmission line, an antenna terminal is connected to the other end of the second transmission line, and a second filter connection terminal is connected to the other end of the third transmission line, whereby the second transmission line converts the characteristic impedances of the first and third transmission lines so that the impedance matching between the antenna terminal and the first filter connection terminal can be attained, and so that the impedance matching between the antenna terminal and the second filter connection terminal can be attained.

Matching circuit chip, filter with matching circuit, duplexer and cellular phone

The present invention aims to realize, in regard to a high frequency switch used for a mobile communication apparatus such as a portable telephone or the like, a dual band switch having simple structure and changeable to ON and OFF states in two bands. For realizing the aim, the present invention provide a dual band switch comprising a series circuit of a PIN diode ( ) and its compensation circuit ( ), and, the compensation circuit ( ) is formed with a circuit having at least two series resonance points and one parallel resonance point. The above structure allows the impedance of the compensation circuit, which is capacitive in low frequency close to a direct current, to be inductive after undergoing the first series resonance point, whereby the parasitic capacity of the diode is canceled in the first band, and also to be inductive again after undergoing the parallel resonance point and the following series resonance point, whereby the parasitic capacity of the PIN diode is canceled in the second band.

Diode compensation circuit including two series and one parallel resonance points

A small multilayer filter, in which a phase shifter may be constituted without increasing overall size of the filter. The overall size may be reduced without deteriorating the characteristics. Above the open end of a plurality of strip lines A provided on a dielectric layer a coupling sector A of input/output pattern is placed to face it with a dielectric layer interposed. An inductance L L is formed by connecting a side electrode A, B with a continuity sector B of input/output pattern; and said side electrode A, B with an input electrode A, output electrode B, respectively, by means of an electrode pattern A.

Multilayer filter having varied dielectric constant regions

Saw filter antenna sharing device using the same, and mobile communication terminal using the same

An antenna device used in mobile communication apparatus such as cellular phones, and which achieves good transmission and reception of information in more than one frequency band. Easy and wide ranging adjustment of the impedance properties of the antenna as well as their productive mass production is allowed. The antenna device includes a) a spiral-shaped first antenna element ( ) of which one end is open and the other end is electrically connected to a high frequency circuit inside a communication terminal; and b) a second antenna element ( ) having both ends being open, and which is insulated from and disposed on either outer or inner surface of the first antenna element ( ). The impedance properties of an antenna can be adjusted by changing the disposing position of the second antenna element ( ).

Antenna device and mobile communication unit

A diplexer employed in mobile communications equipment such mobile phones which can divide signals into two channels with a simple configuration without interfering the other band. In this diplexer, an inductor is connected between a &pgr;-type three-stage one polar low-pass filter and a common terminal as a first matching circuit, and a capacitor A is connected between a one polar band-pass filter and a common terminal as a second matching circuit so that interference with the other band can be prevented and the higher harmonics can be sufficiently attenuated with simple configuration.

Diplexer duplexer and two-channel mobile communications equipment

A small multilayer filter, in which a phase shifter may be constituted without increasing overall size of the filter. The overall size may be reduced without deteriorating the characteristics. Above the open end of a plurality of strip lines A provided on a dielectric layer , a coupling sector A of input/output pattern is placed to face it with a dielectric layer interposed. An inductance L , L is formed by connecting a side electrode A, B with a continuity sector B of input/output pattern; and said side electrode A, B with an input electrode A, output electrode B, respectively, by means of an electrode pattern A.

Multilayer filter with electrode patterns connected on different side surfaces to side electrodes and input/output electrodes

Growing community of inventors

Osaka, Japan

Naoki Yuda