The University of Electro-communications

Hiroto Otsuka

Kazuhiko Honjo

Ryo Ishikawa

Akira Saito

Akira Saitou

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.

Wireless communication device and antenna device

Circular loop antenna elements of each of a transmitting antennaand a receiving antennahave different perimeters of approximately integral multiples of a wavelength determined from a wireless communication frequency. The transmitting antennaand the receiving antennainclude first circular loop antenna groupsA andA concentrically disposed on the same plane and second circular loop antenna groupsB andB 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)&#x3c0;/2m(where l is any integer, and mis a value of mto mthat are approximately integral multiples of a wavelength) in the first and second circular loop antenna groups.

Growing community of inventors

Tokyo, Japan

Hiroto Otsuka