| 摘要 |
<P>PROBLEM TO BE SOLVED: To make transmission of reflected waves accelerated, exceeding the limit of the driving speed of an antenna switch for terminating a reflector-side antenna. <P>SOLUTION: A non-contact transmission device transmits (n) unmodulated carriers. A mobile terminal device side, once separating the (n) unmodulated carriers by (n) filters, modulate the respective unmodulated carriers with (n) serial/parallel-converted transmission data, by using (n) antenna switches to generate modulated reflected wave signals having modulation speeds f<SB>m</SB>, respectively, thereby realizing (n) modulation speeds f<SB>m</SB>, in total. Then (n) frequencies are arranged at intervals of the integral multiples of the modulation speeds f<SB>m</SB>, i.e. at mutually null points and the interferences among carriers are suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT |
