Murata Manufacturing Co., Ltd.

Matsushita Electric Industrial Co., Ltd.

Murata Mfg. Co., Ltd.

Kazuya Sayanagi

Takekazu Okada

Yuichi Maruyama

Yutaka Sasaki

Ikuo Takakuwa

Kiyoshi Nakanishi

Akihiro Sasabata

On one surface of a dielectric substrate having a thickness of one quarter of a signal wavelength, a ground electrode, and a strip line, one end thereof being connected to a high-frequency element via a wire, are formed. On the opposite surface thereof, which opposes a waveguide, a ground electrode is formed, a first electrode opening having a predetermined length and width is formed, opposite to a proximity of an open end of the strip line, and a second electrode opening is formed so that a center line of a width thereof is separated outward by one quarter of the signal wavelength from a conductor wall of the waveguide. Furthermore, via holes having a length of one quarter of the signal wavelength, electrically connecting the ground electrodes on either surface, are formed. The waveguide is disposed in proximity to the dielectric substrate so that a center of the first electrode opening coincides with that of the waveguide.

High-frequency line transducer, having an electrode opening surrounded by inner and outer vias

A ground electrode and a terminal electrode are formed on a first main surface of dielectric substrate forming a circuit board. Wiring electrodes are formed on a second main surface of the dielectric substrate. A semiconductor device and a filter are mounted on the wiring electrodes. A strip line electrode of the filter is connected to the ground electrode of the circuit board for conducting direct current, via a through-hole provided in the filter, a ground electrode of the filter, the wiring electrode, and a through-hole provided in the circuit board. With this arrangement, the terminal electrode is connected to a high-frequency signal terminal of the semiconductor device via the filter.

High-frequency circuit board unit, high frequency module using the same unit, electronic apparatus using the same module, and manufacturing method for the high-frequency circuit board unit

An antenna-integrated strip line cable with which it is possible to improve the performance of a high-frequency appliance such as a portable telephone without making the appliance larger. An antenna-integrated strip line cable 1 is made up of a transmission line part 2, an antenna part 3 and a counterpoise 4. The transmission line part 2 is made up of two conductors 21, 22 disposed in parallel, insulators 23, 24 having plasticity or flexibility disposed between these two conductors 21, 22, and a central conductor 25 disposed between the insulators 23, 24 centrally in the width direction thereof. Wide-pattern impedance matching circuits 26a, 26b are provided in the central conductor 25. The antenna part 3 has portions of the insulator 24 and the central conductor 25 extending from the transmission line part 2. The counterpoise 4 has portions of the insulator 23 and the conductor 21 extending from the transmission line part 2. The counterpoise 4 is perpendicular to the antenna part 3 and the length of the counterpoise 4 is about one-fourth of the wavelength .lambda. of the frequency used. Some benefits of this novel construction are that the number of parts is reduced, the work of connecting a coaxial cable to an antenna is made unnecessary, the counterpoise reduces directivity of the antenna part, the antenna is tough, and it is not necessary to provide an impedance matching circuit externally.

Antenna-integrated strip line cable

In a multi-plate high frequency parallel strip-line cable including a strip-shaped dielectric body made of either an electrical insulating material having a flexibility or another electrical insulating material having a plasticity, the dielectric body is composed of a pair of dielectric layers. A pair of thin-film-shaped earth conductors is formed on both surfaces of the dielectric body so as to oppose to each other, and a thin-film-shaped center conductor is formed between the pair of dielectric layers in the dielectric body so as to be located between a pair of earth conductors. Further, a circuit device part such as an impedance adjusting circuit, a filter, an attenuator or the like is formed between a pair of dielectric layers in the dielectric body so as to be electrically connected with the center conductor, thereby the parallel strip-line cable having either a flexibility or a plasticity. Furthermore, a further dielectric body composed a pair of further dielectric layers may be formed on one earth conductor with a further earth conductor formed thereon. In this case, the circuit device part is formed in the further dielectric body.

Multi-plate type high frequency parallel strip-line cable comprising

In a high frequency parallel strip line cable including a pair of thin-film-shaped earth conductors formed on both surfaces of a dielectric body so as to oppose to each other, a thin-film-shaped center conductor is formed in the dielectric body so as to be located between the pair of earth conductors, and the connector part is formed in one end of the high frequency parallel strip line cable so as to expose one end of the center conductor. Further, a connector is provided for connecting with the connector part of the high frequency parallel strip line cable. In the connector, a connection concave for inserting the connector part is formed in a dielectric case. An elastic center conductor terminal for electrically connecting to the center conductor of the high frequency parallel strip line cable is mounted in the dielectric case so as to extend into the connection concave, and at least one elastic earth conductor terminal for electrically connecting to at least one of the earth conductors of the high frequency parallel strip line cable is mounted in the dielectric case so as to extend into the connection concave.

Growing community of inventors

Osaka, Japan

Kazuya Sayanagi