Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Holdings Corporation

Shoichi Kajiwara

Hiroyuki Tani

Atsushi Yamamoto

Yoshio Koyanagi

Koichi Ogawa

Yutaka Saito

Akihiro Ozaki

Yoshitaka Asayama

Yuki Tanaka

Kazuhiro Ikurumi

Yoichiro Ueda

Kazuhiko Ikeda

Takuma Ikeda

Hirofumi Kosaka

Osamu Kumazawa

A radio power transmission system and a radio power transmission method are provided. The radio power transmission system includes a first radio device and a second radio device including a control signal generator and an antenna. The control signal generator generates a control signal for synchronizing frequencies and phases of power waves, based on signals indicating reception intensities of the power waves in a receiving device receiving the power waves. The antenna transmits the control signal to a plurality of the first radio devices. In the radio power transmission system, the plurality of first radio devices radiate, toward the receiving device, the power waves having the frequencies and phases set to a predetermined value based on the control signal.

Radio power transmission system and radio power transmission method

An apparatus for determining a type of an electromagnetic wave generating source, including: a measurement unit that measures electromagnetic field strength at first and second measurement points at vertically different respective distances from a main surface of an object to be measured; a calculation unit that calculates an attenuation amount of the electromagnetic field strength between the first and second measurement points using measured values of the electromagnetic field strength measured by the measurement unit; and a determination unit that determines whether the generating source is the electric current source or the magnetic current source by judging which one of a reference value of an electric current source and a reference value of a magnetic current source is close to a value of the attenuation amount calculated by the calculation unit.

Apparatus and method for determining the type of electromagnetic wave generating source

An electromagnetic wave measuring method is provided that is capable of performing high-precision measurement in a shorter time and in a greater variety of frequency bands than heretofore with a comparatively simple configuration. A plate-like antenna () of which the outline shape of an opposed surface opposite a measured object () is similar to the outline shape of an opposed surface of the measured object () is brought close to the measured object (), and an electromagnetic wave from the measured object () is measured based on the frequency spectrum of a received signal received by the plate-like antenna ().

Electromagnetic wave measuring method and electromagnetic wave measuring apparatus

In order to direct a probe having directivity that a received band is widened in accordance with a measurement distance, toward a DUT, shift the received band of the probe in sequence, receive electromagnetic, and measure electromagnetic interference, a plurality of long and short measurement distances between the probe and the DUT are set, and measurement at the long measurement distance and measurement at the short measurement distance are performed plural times. Herein, the measurement at the short measurement distance is performed on a received band where electromagnetic interference is measured by the measurement at the long measurement distance. Thus, measurement of electromagnetic interference can be performed with high accuracy in a short time.

Method and apparatus of electromagnetic measurement

In an apparatus for measuring a specific absorption rate (SAR), a first near magnetic field distribution of a radio wave radiated from an array antenna of a reference antenna including a plurality of minute antennas is measured, and an SAR distribution with respect to the radio wave radiated from the array antenna is measured with a predetermined phantom. Then a distribution of a transformation coefficient &#x3b1; is calculated by dividing the measured SAR distribution by a square of the measured first near magnetic field distribution, a second near magnetic field distribution of a radio wave radiated from a measured radio communication apparatus is measured, and an SAR distribution with respect to the radio wave radiated from the radio communication apparatus is calculated by multiplying a square of the measured second near magnetic field distribution by the calculated distribution of the transformation coefficient &#x3b1;.

Apparatus for measuring specific absorption rate of radio communication apparatus

In an apparatus for measuring a specific absorption rate (SAR) for use in a radio apparatus, a first near magnetic field of a radio wave radiated from a reference radio apparatus is measured in free space, and an SAR of the radio wave radiated from the reference radio apparatus by using a predetermined phantom according to a predetermined measurement method. A transformation factor &#x3b1; is calculated by dividing the measured SAR by a square value of the measured first near magnetic field, and a second near magnetic field of a radio wave radiated from a radio apparatus to be measured is measured in free space. Then an SAR of the radio wave radiated from the radio apparatus to be measured is estimated and calculated by multiplying a square value of the measured second near magnetic field by the calculated transformation factor &#x3b1;.

Apparatus for measuring specific absorption rate based on near magnetic field for use in radio apparatus

An electromagnetic wave measuring apparatus includes a loop probe section having loop probes whose loop planes are placed so as to be perpendicular to each other, and each loop probe is placed so that its magnetic field detection space is not interfered with by other loop probes. If the loop probe section is placed at measurement position coordinates x, y, it detects a magnetic field component at the measurement position coordinates x, y, which is parallel to an XY plane, and a magnetic field component in a Z-axis direction at measurement position coordinates x, y, and repeats measurement by pitch p in a positive Y-axis direction. By calculating the root sum square of the detection results at each measurement position coordinate, a three-dimensional magnetic field level of an object to be measured can be obtained at each measurement position coordinate as electromagnetic field distribution with high-precision.

Electromagnetic wave measuring apparatus and method

Based on a relationship between cutting-and-removing amounts for partly cutting out a stub of a pattern line and impedances of a matching circuit, a cutting-and-removing amount for adjusting the impedance to a target value is determined by simulation or by comparison operation of an impedance measured value with information stored in a database. Then, based on the determined cutting-and-removing amount, the stub of the pattern line is partly cut and removed so that the impedance is adjusted to the target value.

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Osaka, Japan

Shoichi Kajiwara