Transmitting / receiving antenna and transmitter / receiver device using the same

A transmitting/receiving antenna device, comprising:

• a dielectric board;
• a driven loop antenna, which is formed by a conductor, provided to the dielectric board;
• a transmission processor connection terminal connected to the driven loop antenna;
• a transmission processor, which is connected to the transmission processor connection terminal;
• a transmitting/receiving loop antenna, which is formed by a conductor, arranged in close vicinity to the driven loop antenna in a non-contact state;
• a resonance capacitor connected to both ends of the transmitting/receiving loop antenna;
• and
• a receiving processor connection terminal connected to the transmitting/receiving loop antenna;
• a receiving processor, which is connected to the receiving processor connection terminal;
• wherein the driven loop antenna is constructed to have a loop wound in a single loop, and the transmitting/receiving loop antenna is constructed to have a loop wound in plural loops, the driven loop antenna and the transmitting/receiving loop antenna generating a mutual inductance between the driven loop antenna and the transmitting/receiving loop antenna.