Abstract
AbstractAs a sensor capable of identifying the direction of the signal propagating along a transmission line on a printed circuit board and the mismatch of the characteristic impedances and its location, a directional‐coupler sensor in a stripline configuration is conceived. The tested sensor can measure the direction of the electromagnetic wave and the mismatch location of the characteristic impedances along the transmission line, which has been difficult to do with magnetic or electric sensors. In this paper, physical shape of the sensor with the best directionality is derived by FDTD numerical calculations. Such a sensor is fabricated and its effectiveness is demonstrated. It is confirmed that the tested sensor has a directivity of more than 25 dB at frequencies below 6 GHz, and of more than 17 dB at frequencies below 7 GHz. © 2005 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 88(8): 41–49, 2005; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/ecja.10146
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