| 摘要 |
In a mobile phone, a vibrator 102 having two power supply terminals of a first terminal a and a second terminal b is arranged on a substrate 101. The vibrator 102 is one of essential electronic components which informs the user of an incoming call and the like during manner mode. The first terminal a of the vibrator 102 is connected to a control circuit unit 109 via a first wiring a103, a coil a104 and a second wiring a105. In addition, the second terminal b of the vibrator 102 is connected to the control circuit unit 109 via a first wiring b106, a coil b107 and a second wiring b108. A capacitor b111 is connected between the first wiring a103 and the first wiring b106. One end of an antenna sub-element 112 is connected to the first wiring a103 via a capacitor a110. The other end of the antenna sub-element 112 is connected to a radio circuit unit 114 via a matching circuit 113. An antenna unit 115 including the radio circuit unit 114 and the antenna sub-element 112 operates at a frequency »2. The radio control unit 109 and the vibrator 102 operate at a frequency »1. The frequency »2 corresponds to a frequency utilized for communications. Generally, »2 > »1 holds true. In addition, the coil a104 and the coil b107 have a self resonant frequency of »2 and are designed to form a short-circuit connection at the frequency »1 and an open-circuit connection at the frequency »2. The capacitor a110 and the capacitor b111 are designed to form an open-circuit connection at the frequency »1 and a short-circuit connection at the frequency »2. This enables reduction of the number of antenna component members mounted on a radio and reduction in size of an antenna. |
