TRANSMITTER/RECEIVER

PROBLEM TO BE SOLVED: To easily separate various frequency ranges by providing one dielectric resonator antenna for forming one antenna arrangement. SOLUTION: This transmitter/receiver has a reception channel having a reception antenna and a transmission channel having a transmission antenna. A dielectric resonator antenna 10 is used for the reception antenna and transmission antenna. The dielectric resonator antenna 10 is extremely miniaturized and enables surface mounting (SMD techniques). Further, because of its physical characteristics, the dielectric resonator antenna 10 can be operated only in the extremely narrow frequency bands near a resonance frequency. The dielectric resonator antenna 10 has the main body (ceramic, for example,) of dielectric arranged on a surface covered with a metal. The transmission antenna is matched with a transmission frequency and the reception antenna is matched with a reception frequency. Because of narrow band characteristics, any other filter is not required for separating the reception channel and transmission channel.