Hitachi Metals, Ltd.

Marino-Forum21

Tokyo Kyuei Co., Ltd.

Mitsuhiro Watanabe

Shigeru Kemmochi

Hiroyuki Tai

Tsuyoshi Taketa

Keisuke Fukamachi

Kazuhiro Hagiwara

Satoru Yokouchi

Toshihiko Tanaka

Hirohiko Miki

Masayuki Uchida

Masaki Nakamura

Takahiro Yamashita

Yoshiyuki Murakami

Provided is a magnetic sheet including a resin film and a thin sheet-shaped magnetic body adhered to the resin film by an adhesive layer sandwiched between the thin sheet-shaped magnetic body and the resin film. The thin sheet-shaped magnetic body is made from an Fe-based metal magnetic material, has a thickness of 15 &#x3bc;m to 35 &#x3bc;m, and has an AC relative magnetic permeability (&#x3bc;) in the range of 220 to 770 at a frequency of 500 kHz.

Magnetic sheet, electronic device using same, and method for manufacturing magnetic sheet

A multiband high-frequency circuit comprising a first switch SPDTfor switching the connections of a multiband antenna to transmitting circuits-T,-T and receiving circuits-R,-R of first and second communications systems, and a transmitting/receiving circuit BLT-TR of a third communications system, a diplexer circuit Dipfor branching a high-frequency signal to-R and-R or BLT-TR and a diplexer circuit Dipfor branching a high-frequency signal to-T and-T, both of which are disposed downstream of SPDT, each diplexer circuit Dip, Dipcomprising a lower-frequency-side filter and a high-frequency-side filter, a bandpass filter BPFbeing disposed downstream of the lower-frequency-side filter of the diplexer circuit Dip, and a second switch SPDTbeing disposed downstream of the bandpass filter BPF

Multiband high-frequency circuit, multiband high-frequency circuit device and multiband communications apparatus comprising same

A high-frequency circuit comprising a high-frequency switch circuit for switching the three-way connection of an antenna to a transmitting circuit for the first communications system, a receiving circuit for a first communications system, and a transmitting/receiving circuit for a second communications system; a first bandpass filter disposed between the antenna and the high-frequency switch circuit; and a balanced-unbalanced conversion circuit disposed between the receiving circuit of the first communications system and the high-frequency switch circuit.

Multi-band-high-frequency circuit, multi-band high-frequency circuit component and multi-band communication apparatus using same

A DC-DC converter comprising a soft-magnetic, multi-layer substrate provided with a laminated coil constituted by connecting pluralities of conductor lines, and a semiconductor integrated circuit device comprising a switching device and a control circuit, which are mounted on the soft-magnetic, multi-layer substrate; the semiconductor integrated circuit device comprising an input terminal, an output terminal, a first control terminal for controlling the ON/OFF of the switching device, a second control terminal for variably controlling output voltage, and pluralities of ground terminals; the soft-magnetic, multi-layer substrate comprising first external terminals formed on a first main surface, first connecting wires formed on the first main surface and/or on nearby layers, second connecting wires formed between the side surface of the multi-layer substrate and a periphery of the laminated coil, and second external terminals formed on a second main surface; and terminals of the semiconductor integrated circuit device being connected to the first external terminals on the multi-layer substrate, at least part of the first external terminals being electrically connected to the second external terminals through the first and second connecting wires, and the input or output terminal being connected to the second external terminals via the laminated coil.

DC-DC converter

A high-frequency switch circuit common to a plurality of frequency bands includes a first high-frequency switch adapted to pass transmission signals and block received signals; and a demultiplexer. The high-frequency switch circuit passes one of the received signals of first and second frequency bands and blocks the other.

High-frequency switch circuit, high-frequency switch module and wireless communications device comprising it

A high-frequency switch module, including a laminate constituted of dielectric layers having electrode patterns, the high-frequency switch module also including a high-frequency switch circuit for switching a transmitting circuit and a receiving circuit of transmitting/receiving systems, and a filter circuit connected to a receiving side of the high-frequency switch circuit.

High-frequency switch module

An unbalanced-balanced multiband filter module comprising three high-frequency switches each comprising a switching element, and two unbalanced-balanced bandpass filters having different transmitting frequency bands, a first high-frequency switch being connected to an unbalanced port of the module, an unbalanced port of the first unbalanced-balanced bandpass filter, and an unbalanced port of the second unbalanced-balanced bandpass filter; a second high-frequency switch being connected to a first balanced port of the module, a first balanced port of the first unbalanced-balanced bandpass filter, and a first balanced port of the second unbalanced-balanced bandpass filter; a third high-frequency switch being connected to a second balanced port of the module, a second balanced port of the first unbalanced-balanced bandpass filter, and a second balanced port of the second unbalanced-balanced bandpass filter; and the first to third high-frequency switches being switched depending on a passing high-frequency signal, whereby a high-frequency signal input into an unbalanced port of the module is output from the first and second balanced ports, or a high-frequency signal input into the first and second balanced ports is output from an unbalanced port of the module.

Unbalanced-balanced multiband filter module

A switch circuit for switching the connection of the receiving or transmitting circuits of two communication systems to an antenna circuit, which comprises first and second switch means having two switching elements, the first switch means comprising a first inductance element between a port connected to the antenna circuit and a port connected to the second switch means; the second switch means comprising a second inductance element between a port connected to the first switch means and a port connected to a receiving circuit of a first communication system, and a transmission line constituting the first inductance element having a lower characteristic impedance than that of a transmission line constituting the second inductance element.

Switch circuit and composite high frequency elements

A high-frequency switch circuit is provided for switching a connection between a common transmission circuit and antenna side circuit in a plurality of transmitting and receiving systems. The high-frequency switch includes a connection between the antenna side circuit and a reception circuit in one of the plurality of transmitting and receiving systems, and a connection between the antenna side circuit and a reception circuit in the other of the plurality of transmitting and receiving systems, the high-frequency switch circuit comprising a first diode; a first distributed constant line; a second diode; a capacitor; a third diode; a second distributed constant line; and a fourth diode.

High-frequency switch circuit

A switch circuit for selectively switching connection of an antenna side circuit with a reception circuit and a transmission circuit of two communication systems one of which has a reception frequency band partially overlapped with a transmission frequency of the other. The switch circuit includes (a) a first switch unit for switching connection of the antenna side circuit with the transmission circuit side of the first and tie second communication systems and the reception circuit side of the first and the second communication system and (b) a second switch unit connected between the first switch unit and the reception circuit of the first and the second communication system for switching connection of the antenna side circuit with the reception circuit of the first and the second communication system. (c) The transmission circuit side of the first and the second communication system of the first switch unit is connected to a transmission circuit shared by the first and the second communication system. (d) When the transmission circuit of the first and the second communication system is connected to the antenna side circuit, the second switch unit cuts off the connection between the reception circuit of the first communication system and the first switch unit.

Switch circuit and composite high-frequency part

A high-frequency switch circuit is provided for switching a connection between a common transmission circuit and an antenna side circuit in a plurality of transmitting and receiving systems. The high-frequency switch includes a connection between the antenna side circuit and a reception circuit in one of the plurality of transmitting and receiving systems, and a connection between the antenna side circuit and a reception circuit in the other of the plurality of transmitting and receiving systems, the high-frequency switch circuit comprising a first diode, a second diode, and a distributed constant line, wherein a third diode is connected to the first and second diodes through the distributed constant line.

A multi-band antenna switch circuit including a diplexer connected to an antenna terminal for demultiplexing signals of different passing bands, a first and a second switch circuit for switching a high frequency signal and a low frequency signal demultiplexed by the diplexer to a plurality of transmission/reception terminals, a first and a second low pass filter connected to a transmission path between the diplexer and the transmission terminal or between the first and the second switch circuit and the transmission terminal, and a notch filter provided between the diplexer and the first switch circuit or between the diplexer and the second switch circuit. The multi-band antenna switch circuit includes a high pass filter having an input terminal and an output terminal and provided at least between die diplexer and the antenna terminal and including a first inductor connected between the input terminal and the ground, a first capacitor connected between the input terminal and the output terminal, a second inductor connected to the output terminal, and a second capacitor connected between the second inductor and the ground.

Bypass filter, multi-band antenna switch circuit, and layered module composite part and communication device using them

A high-frequency module is connected to a transmitting circuit, a receiving circuit, and an antenna to control the connections between the transmitting circuit and the antenna and between the receiving circuit and the antenna. The module includes means for controlling transmitted signals, which includes a first phase-shift circuit and a high-frequency amplifier provided between the antenna and the transmitting circuit. The high-frequency amplifier and the first phase-shift circuit are integrated into a module composed of a plurality of dielectric layers.

Growing community of inventors

Tottori-ken, Japan

Mitsuhiro Watanabe