| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To separate a signal superimposed in a substrate of a head unit or an on-vehicle unit main body when a head unit including a floodlight/light receiving device for an optical VICS and an antenna for DSRC is connected with an on-vehicle unit main body by a coaxial cable and a DSRC transmitting/receiving signal to be transmitted on the coaxial cable is transmitted by superimposing an optical VICS transmitting/receiving signal. <P>SOLUTION: A line through which the signal for optical VICS passes is branched from a line through which a signal for DSRC passes, their characteristic impedance is equalized from the branching point to a position of electric length, where a phase in a frequency of the DSRC becomes 90°and capacity ground is performed at the position of the electric length where the phase becomes 90°in the frequency of DSRC from the branching point. Standing waves of a signal frequency band of the DSRC are generated on a pattern of a substrate to minimize an influence of line branching to an optical VICS circuit block. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
