| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a circuit board which can improve radiation efficiency of a radio communication antenna which operates in a plurality of frequency bands, or a plurality of radio communication antennas which operate at different frequencies. <P>SOLUTION: A circuit board 1 is configured to feed power to a plurality of radio communication antennas 3a, 3b, with a ground pattern formed on its surface. The plurality of antennas 3a, 3b operate at different frequencies, respectively, and a feeding position of each of the antennas is determined independently of a feeding position of the other antenna. The ground pattern includes a notched part 10 for improving radiation efficiency of the plurality of antennas 3a, 3b and the notched part 10 includes a current control part 12 for controlling the path of a current flowing to the substrate itself in accordance with the different frequency bands of the plurality of antennas 3a, 3b. Therefore, the circuit board 1 is enabled to improve the radiation efficiency of a plurality of radio communication antennas, which operate at different frequencies, respectively. <P>COPYRIGHT: (C)2011,JPO&INPIT |
