ANTENNA DEVICE FOR TRANSMITTING AND RECEIVING OF ELECTROMAGNETIC WAVES

PROBLEM TO BE SOLVED: To provide an antenna device for transmitting and receiving electromagnetic waves which can cope with a data responder, regardless of the incident angle of the responder. SOLUTION: Passive antennas 24-1 and 24-2 are constituted in such a structure, that can cope with the data responder coming in with a two-dimensional inclination by combining the antennas 24-1 and 24-2 with each other, so that specific electromagnetic waves outputted to an active antenna 22 by means of a converter by adjusting an impedance which is to intersect each other at right angles. The antennas 24-1 and 24-2 can be made to obtain desired capacities, corresponding to the induced inductances of the antennas 24-1 and 24-2 so as to meet the frequency of the converter, by causing the antenna 24-1 and 24-2 to generate electromagnetic waves through electromagnetic induction. Consequently, this antenna device can cope with the data responder regardless of the incident angle of the responder to the antennas 24-1 and 24-2, and at the same time, the electromagnetic waves generated from the antennas 24-1 and 24-2 can be resonated at the frequency of the converter.