Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Hiroshi Ikematsu

Tadashi Takagi

Morishige Hieda

Kazuyoshi Inami

Kenichi Miyaguchi

Norio Takeuchi

Michiaki Kasahara

Hiromasa Nakaguro

Atsushi Yamamoto

Hiroyuki Sato

Kenji Itoh

Kazutomi Mori

Kenji Kawakami

Hideki Morishige

Koji Namura

A planar antenna includes a plurality of antenna elements and transmits and receives a radio wave to and from a target. An attitude controller is attached to the planar antenna and controls an attitude of the planar antenna mechanically. An antenna controller controls the attitude controller such that the planar antenna points in a predetermined direction with respect to the target. A scan controller controls beam scanning performed by the planar antenna and adjusts an excitation phase of each of the antenna elements in accordance with a signal level of a reception signal generated from a radio wave received from the target during performance of the beam scanning, thereby directing a beam from the planar antenna toward the target. The scan controller limits a range of the beam scanning to a range within which no grating lobe occurs.

Antenna device, antenna control method, and program

A wireless power transfer system includes: a plurality of power transmitters, each of which transmits a microwave; and a rectenna base station which receives the microwave to generate power. The rectenna base station includes: a rectenna; and control section which specifies an identification code for identifying each power transmitter and generates a command signal to change a phase of the power transmitter specified by identification code so as to increase a power value received at the rectenna. Each of the power transmitters comprises: a plurality of transmission antenna elements, each of which transmits the microwave to the rectenna base station; and a phase controller which makes phase change of the microwave based on the command signal from the phase monitor and control section of the rectenna base station if the identification code matches a stored identification code.

Wireless power transfer system, power transmitter, and rectenna base station

A phase shifter includes an FEThaving its drain electrode connected to an input/output terminal; and FEThaving its drain electrode connected to the source electrode of the FETand its source electrode connected to an input/output terminal; and FEThaving its drain electrode connected to the source electrode of the FET; and an inductorhaving its first terminal connected to the source electrode of the FETand its second terminal connected to a ground. It can reduce the insertion loss by narrowing the gate width of the FET, and carries out the phase shift of a high-frequency signal with suppressing the reflection.

Phase shifter and multibit phase shifter

A miniaturized phase shifter and a multi-bit phase shifter are provided, in which filters are constructed using capacitors at FET pinch-off and pass phase can be shifted by turning the FET on and off, the phase shifter including: a first FET having a drain electrode connected to an input terminal and a source electrode connected to an output terminal; a second FET, in which one of a drain electrode and a source electrode thereof is connected to the source electrode of the first FET and the other is connected to ground via a first inductor; and a third FET, in which one of a drain electrode and a source electrode thereof is connected to the drain electrode of the first FET and the other is connected to ground via a second inductor.

If a local oscillation wave of a frequency approximately half the received signal frequency is input to a low noise amplifier a dc offset voltage caused by the nonlinearity of the amplifier is produced, thus degrading reception sensitivity. This problem is resolved by disposing before the low noise amplifier a filter means, such as a bandpass filter band-elimination filter or high pass filter with characteristics for passing the received wave and suppressing a frequency band at approximately half the received wave frequency, thus preventing a radiation wave at substantially the same frequency as the local oscillation wave from being input to the low noise amplifier A filter circuit is also provided in the low noise amplifier as a means for eliminating a radiation wave input to the low noise amplifier

Even harmonic direct-conversion receiver, and a transmitting and receiving apparatus using the same

A Pulse-Doppler radar apparatus is constructed such that an output of an oscillator is divided by a distributor and an on/off switch for generating pulses is coupled to an IF input of a first harmonic mixer, in order to improve precision in measurement of a distance and speed.

Growing community of inventors

Tokyo, Japan

Hiroshi Ikematsu