| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a measurement method which can determine not only the magnitude of a phase difference but also the sign of the phase difference over a wide frequency range in measurement of phase distribution of a near electromagnetic field. <P>SOLUTION: The electromagnetic field strength at a measurement point and the electromagnetic field strength at an adjacent point for phase comparison are measured simultaneously, and a signal for phase comparison with its phase shifted is added to a measurement signal, to calculate the magnitude and the sign of the phase difference between the measurement points. <P>COPYRIGHT: (C)2013,JPO&INPIT |
