Tdk Corporation

Hitoyoshi Kurata

Hideaki Shimoda

Shigeru Asami

Eriko Ajioka

Hiroshi Ikeda

Yoshinari Yamashita

Takuya Adachi

Takeshi Yokoyama

Masami Itakura

Kazutaka Tamaki

A power transmission device includes a power conversion circuit that outputs an alternating voltage in order to generate an alternating magnetic field and a control circuit used to control a frequency of the alternating voltage. The control circuit sets, in a predetermined frequency range, the frequency of the alternating voltage to a higher one of a first frequency at which transmission efficiency is highest and a second frequency at which a voltage generated in the power receiving device is highest, and performs power transmission.

Power transmission device and wireless power transmission system using the power transmission device

A wireless power feeder has a power feed coil that performs a power feed by a non-contact method to a wireless power receiver having a power receive coil. A power source section supplies AC power to the power feed coil. A control section calculates a power transmission efficiency from the power feed coil to the power receive coil to control a power source section so that the power supply to the power feed coil is in a stopped or intermittent state when the power transmission efficiency is lower than a first determination reference value; is in a first power supply state when the power transmission efficiency is equal to or higher than the first determination reference value and lower than a larger second determination reference value; and is in a second power supply state when the power transmission efficiency is equal to or higher than the second determination reference value.

Wireless power feeder and wireless power transmission system

A modulated pulse wave requires a pulse width of 1 nsec or less, but it is difficult that a PIN diode, which is conventionally used treats such a modulated pulse wave with narrow pulse width. In order to solve such a problem, it is an object to provide a pulse modulator, which outputs a modulated pulse wave with narrow pulse width and a pulse wave radar device, which can output a modulated pulse wave with narrow pulse width. In order to achieve this operation, the pulse modulator and the pulse wave radar device of the present invention differentiate a pulse from a pulse generating circuit so as to generate a differentiated wave with narrow width, and switch an oscillated wave from an oscillating circuit according to the differentiated wave so as to output a modulated pulse wave with narrow pulse width.

Pulse wave radar device

At least one of a rise time and a fall time of a dielectric resonator oscillator are reduced. The dielectric resonator oscillator includes a dielectric resonator, a drive circuit for applying a resonance voltage to the dielectric resonator, a switch for applying a voltage required for generating the resonance voltage to the drive circuit, a switch for applying a ground voltage for stopping generation of the resonance voltage to the drive circuit, and a capacitor connected to a power terminal side that supplies a voltage, as seen from the switch, for removing noise generated by the drive circuit. If these switches are made conductive exclusively, oscillation can be stopped immediately by turning on the switch. Since the capacitor is in a charge storage state at all times, regardless of ON/OFF of the switch, the oscillation operation can be started immediately when the switch is turned ON.

Dielectric resonator oscillator and radar apparatus using the same

An electronic component module has a device-side module A and an antenna-side module B. The device-side module A is equipped with a first dielectric substratethat is formed with a first transmission lineand a high-frequency devicethat is mounted on the first dielectric substrateand is connected to the first transmission lineThe antenna-side module B is equipped with a second dielectric substratethat is laid on the first dielectric substratein such a manner that they are arranged in a lamination direction and that is formed with a second transmission linethat is electrically connected to the first transmission lineand an antenna elementthat is provided on the second dielectric substrateand electrically connected to the high-frequency devicevia the second transmission lineand the first transmission line

Electronic component module and manufacturing method thereof

An electronic component module according to the invention includes: a mounting substrateincluding a shield layerand on which a first cavityand a second cavityare formed; a first electronic componentpositioned in the first cavityand used in a first frequency band; a second electronic componentpositioned in the second cavityand used in a second frequency band; lid memberswhich seal the first cavityand the second cavity; and patch antennaswhich transmit/receive radio waves in the frequency bands, the antennas connected to the electronic components; wherein the electronic componentsare mounted on the mounting substratevia a substrate componenthaving a higher heat resistance than the mounting substrateand that the mounting substrateis composed of a member having a lower dielectric constant that the substrate component

Electronic component module

An electronic component module includes: printed-circuit boards on which a shield layer is formed; a spacer positioned between the printed-circuit boards, the spacer equipped with a shielding feature which forms as partitions a first cavity and a second cavity between the printed-circuit boards; a first electronic component positioned in the first cavity and mounted on any one of the printed-circuit boards and used in a first frequency band; a second electronic component positioned in the second cavity and mounted on any one of the printed-circuit boards, the second electronic component used in a second frequency band; a patch antenna formed on the surface of the printed-circuit board opposite that on which the spacer is mounted, the antenna transmitting and receiving radio waves at least one of in the first and second frequency bands; and terminals formed on the surface of the printed-circuit board opposite that on which the spacer is mounted.

An electronic component module includes a mounting substrate including a shield layer and on which a first cavity and a second cavity are formed. A first electronic component positioned in the first cavity is used in a first frequency band. A second electronic component positioned in the second cavity is used in a second frequency band. Lid members seal the first cavity and the second cavity. Patch antennas transmit/receive radio waves in the first and second frequency bands, the antennas being formed on a surface opposite to the electronic components mounting surface. And, connection terminals formed on the mounting substrate are electrically connected to the electronic components through transmission lines.

A magnetostatic wave device including a ferrimagnetic film for exciting and propagating magnetostatic waves and a magnetic field generator for applying a magnetic field to the ferrimagnetic film. The magnetic field generator includes a permanent magnet and one pair of yokes that are magnetically connected to the permanent magnet and are opposite to each other with an air gap located between them. The air gap has the ferrimagnetic film received therein.

Magnetostatic wave device

A magnetostatic wave device including a magnetic garnet film which excites and propagates magnetostatic waves upon receiving electromagnetic waves, a magnetic field generator which applies a magnetic field to the magnetic garnet film, first and second ground conductors opposing each other and sandwiching the magnetic garnet film therebetween, and an RF signal feeder line disposed between the magnetic garnet film and the first ground conductors. The first ground conductor has an opposing surface opposed to one main surface of the magnetic garnet film. The second ground conductor has an opposing surface opposed to the other main surface of the magnetic garnet film. In the device,

Magnetostatic wave device with specified distances between magnetic

For patterning a magnetic garnet layer formed on the surface of a non-magnetic garnet substrate, the magnetic garnet layer, an intermediate layer and a resist layer are formed in this order from the substrate side, the intermediate layer and the resist layer are shaped in the state of an island, and then the magnetic garnet layer is etched in a hot phosphoric acid solution, the intermediate layer being composed of a material which is more soluble in the hot phosphoric acid solution than the resist layer so that the etched magnetic garnet layer side face is formed as a gently inclined face and that a conductor pattern extending on both the non-magnetic garnet substrate and magnetic garnet layer surfaces can be formed without breaking, or a protective resist layer being formed on the reverse surface of the substrate so that the application angle of a magnetic field to the magnetic garnet layer surface can be accurately controlled.

Growing community of inventors

Tokyo, Japan

Hitoyoshi Kurata