| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent the deterioration of an antenna gain in speech by automatically changing the impedance of a passive element into a proper impedance according to a transmission/reception frequency in order to prevent currents from being concentrated onto the central section of a circuit board. <P>SOLUTION: The passive element 15 is connected to a circuit board ground 16, and current distribution at a circuit board 11 side is changed by making a circuit board look long so that currents can be prevented from being concentrated onto the section close to the head of a human body. Also, an impedance adjusting circuit for changing the impedance of the passive element 15 is configured between the passive element 15 and the circuit board ground 16 according to a transmission/reception frequency so that the deterioration of an antenna gain in speech can be automatically prevented in the band of all the transmission and reception frequency. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
