| 摘要 |
The present invention is concerned with a transmitting/ receiving antenna, which includes a dielectric board (3), a driven loop antenna (12) provided to the dielectric board, transmit processing portion connection terminals (13) connected to the driven loop antenna, a transmitting/receiving loop antenna (14) arranged in close vicinity to the driven loop antenna in a non-contact state, a resonance capacitor (15) connected to both ends of the transmitting/receiving loop antenna, and receive processing portion connection terminals (16) connected to the transmitting/ receiving loop antenna. The driven loop antenna is constructed to have a loop wound in a single turn, and the transmitting/ receiving loop antenna is constructed to have a loop wound in plural turns. According to this configuration, a wider frequency band of the frequency characteristic and a reduction of the power consumption can be achieved.
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