| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radio circuit using coil-form antennas, which prevents size and cost increases and suppresses an electromagnetic interference between the antennas. <P>SOLUTION: A radio circuit includes: a first radio circuit which uses a coil to wirelessly transmit an electrical signal or power in a first frequency band; and a second radio circuit which uses a coil to wirelessly transmit an electrical signal or power in a second frequency band. The first frequency band is lower band than the second frequency band. The first radio circuit is connected to a terminal of the coil via a low-pass filter circuit, while the second radio circuit is connected to a terminal or mid-point of the coil via a high-pass filter circuit. The low-pass filter circuit includes a serial capacitance element at an input terminal for connecting to the coil. The high-pass filter circuit includes a serial inductance element at an input terminal for connecting to the coil. <P>COPYRIGHT: (C)2013,JPO&INPIT |
