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Electromagnetic irradiation distribution measurement device

A technology of electromagnetic radiation and measuring devices, applied in the direction of measuring devices, measuring electrical variables, electromagnetic field characteristics, etc., can solve the problems of unsatisfactory isolation of micro-ring devices or antenna devices, poor isolation, and reduced detection sensitivity

Inactive Publication Date: 2005-09-07
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there is a problem: the existing sequential selection measurement device takes a considerable time before it completes all measurements, because the measurement is performed by sequential selection of up to 1000 and miniature ring devices
Another problem is that the detection sensitivity is reduced, or the isolation between adjacent micro-ring devices is deteriorated, especially in the high-frequency range such as the 2GHz band, because of the capacitance between the terminals of the switching diode and the transmission line The frequency response of
In the measurement of near electromagnetic fields of high frequency such as the 2GHz band which is the transmission frequency of cellular phones, the isolation between micro loop devices or antenna devices is not satisfactory

Method used

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Examples

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no. 1 example

[0034] figure 1 is an explanatory diagram of the configuration of the electromagnetic radiation distribution measuring device according to the first embodiment of the present invention. figure 1 (a) shows its front view, figure 1 (b) shows its side view. The electromagnetic radiation distribution measurement device includes n ring devices 1a-1n, n coaxial cables 4a-4n, n level detectors 7a-7n, supporting substrate 5, distributor 13, local oscillator 14, AD Converter 15 and Arithmetic Section 16. The electromagnetic radiation distribution measuring device is designed to measure the distribution of a near electromagnetic field radiated from a cellular phone located on a mobile station 18 disposed above the ring devices 1a-1n. The number n of measurement systems comprising ring devices 1a-1n and level detectors 7a-7n is eg 9, and generally around 10.

[0035]The ring devices 1a-1n corresponding to the electromagnetic field detectors each form a ring plane by forming a copper ...

no. 2 example

[0058] image 3 is a side view of the configuration of an electromagnetic radiation distribution measuring device according to a second embodiment of the present invention. and figure 1 Those same components are given the same symbols and numerals, and corresponding explanations are omitted.

[0059] Typically, in order to reduce battery power consumption to a minimum level to extend talk time, cellular phones perform intermittent transmissions in which no radio waves are transmitted when voice is not being transmitted. Therefore, the cellular phone is expected to be in an intermittent transmission state which reflects the actual state in the measurement of the near electromagnetic field radiated from the cellular phone. In this regard, this embodiment shows the configuration of an electromagnetic radiation distribution measuring device for measuring a near electromagnetic field in an intermittent transmission state of a cellular phone.

[0060] The electromagnetic radiatio...

no. 3 example

[0067] Figure 5 is an explanatory diagram of the configuration of an electromagnetic radiation distribution measuring device according to a third embodiment of the present invention, Figure 5 (a) shows its front view, Figure 5 (b) shows its side view. and figure 1 Those parts that are the same as in are given the same symbols and numerals, and the corresponding explanations are omitted.

[0068] Ring devices 1a-1n generally show variations in detection sensitivity according to the dimensional accuracy of the machine. The characteristics of the individual circuit components of the level detectors 7a-7n are not always the same, which leads to variations in detection sensitivity or variations in frequency response. The third embodiment is an example in which the electromagnetic radiation distribution measuring apparatus according to the first and second embodiments has a measurement data calibration characteristic for calibrating detection accuracy and frequency response. ...

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Abstract

An object of the present invention is to measure the distribution of a near electromagnetic field radiated from a small wireless communication device such as a cellular phone at high speed and high precision. The electromagnetic radiation distribution measurement device includes: a plurality of U-shaped ring devices (1a to 1n) mounted on a printed circuit board (2) at predetermined intervals, a support substrate ( 5) and the level detectors (7a to 7n) to which the ring devices (1a to 1n) are to be connected via coaxial cables (4a to 4n) fixed to the support substrate (5). Near electromagnetic field signals detected by the ring devices (1a to 1n) are converted into DC voltage signals (11a to 11n) in level detectors (7a to 7n) and output. The signal is converted into digital data by an AD converter (15), and measurement data of strength of an electromagnetic field in the vicinity obtained by detecting a magnetic field component is stored in a processing section (16).

Description

technical field [0001] The present invention relates to a device for measuring the characteristics of electromagnetic radiation, and more particularly to an electromagnetic radiation distribution measuring device for measuring the distribution of a near electromagnetic field radiated from a wireless communication device such as a cellular phone. Background technique [0002] In general, it is important for device design and EMC countermeasures to understand the distribution of near electromagnetic fields of a wireless communication device such as a cellular phone, that is, from which part of the device electromagnetic waves of what intensity are radiated. In the prior art, there are known devices for measuring the distribution of the near electromagnetic field, such as disclosed in JP-A-62-237363. This device is a sequential selection type measuring device in which about 1000 micro ring devices are arranged in a grid shape in a plane, and detected signals are sequentially se...

Claims

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Application Information

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IPC IPC(8): G01R29/08
CPCG01R29/0814
Inventor 斋藤裕小柳芳雄小川晃一梶原正一尾崎晃弘浅山叔孝
Owner PANASONIC CORP