Abstract: A wireless communication apparatus includes a transmitting antenna; and a receiving antenna that receives a wireless signal transmitted from the transmitting antenna. Each of the transmitting antenna and the receiving antenna includes a plurality of circular loop antennas arranged concentrically in an identical plane, each of the plurality of circular loop antennas having a loop perimeter approximately equal to an integer multiple of one wavelength determined from a frequency in a wireless communication; and a plurality of feeding sections individually connected with the plurality of circular loop antennas. A central axis of the plurality of circular loop antennas of the transmitting antenna and a central axis of the plurality of circular loop antennas of the receiving antenna are arranged approximately on a straight line. Thus, a wireless signal is transmitted between the circular loop antennas having a loop perimeter of a transmitting side and a receiving side.

Abstract: Circular loop antenna elements of each of a transmitting antenna 100 and a receiving antenna 200 have different perimeters of approximately integral multiples of a wavelength determined from a wireless communication frequency. The transmitting antenna 100 and the receiving antenna 200 include first circular loop antenna groups 100A and 200A concentrically disposed on the same plane and second circular loop antenna groups 100B and 200B including circular loop antenna elements of the same perimeter as that of a plurality of circular loop antenna elements of the first circular loop antenna group. An angular position of a terminal for connecting power supply units to circular loop antenna elements having the same perimeter is set to an angular position rotated by (2l+1)?/2mi (where l is any integer, and mi is a value of m1 to mN that are approximately integral multiples of a wavelength) in the first and second circular loop antenna groups.

Abstract: Circular loop antenna elements of each of a transmitting antenna and a receiving antenna have different perimeters of approximately integral multiples of a wavelength determined from a wireless communication frequency. The transmitting antenna and the receiving antenna include first circular loop antenna groups concentrically disposed on the same plane and second circular loop antenna groups including circular loop antenna elements of the same perimeter as that of a plurality of circular loop antenna elements of the first circular loop antenna group. An angular position of a terminal for connecting power supply units to circular loop antenna elements having the same perimeter is set to an angular position rotated by (2l+1)?/2mi (where l is any integer, and mi is a value of m1 to mN that are approximately integral multiples of a wavelength) in the first and second circular loop antenna groups.

Abstract: A wireless communication apparatus includes a transmitting antenna; and a receiving antenna that receives a wireless signal transmitted from the transmitting antenna. Each of the transmitting antenna and the receiving antenna includes a plurality of circular loop antennas arranged concentrically in an identical plane, each of the plurality of circular loop antennas having a loop perimeter approximately equal to an integer multiple of one wavelength determined from a frequency in a wireless communication; and a plurality of feeding sections individually connected with the plurality of circular loop antennas. A central axis of the plurality of circular loop antennas of the transmitting antenna and a central axis of the plurality of circular loop antennas of the receiving antenna are arranged approximately on a straight line. Thus, a wireless signal is transmitted between the circular loop antennas having a loop perimeter of a transmitting side and a receiving side.