To more easily and inexpensively manufacture a loop antenna by making the intensity of a magnetic field near an antenna to be strong and that a remote place to be weak and eliminating the need of adjusting the total area, the shapes and the line lengths of two loop antennas.
First and second loop antennas 1 and 2 which are closely arranged are installed. The total areas, the shapes and the line lengths of the first and second loop antennas 1 and 2 are equal. The directions of currents flowing in the first and second loop antennas 1 and 2 are made to be opposite and therefore phases are set to be opposite. The first and second loop antennas 1 and 2 are connected in parallel and they share power feeding points 3. The first and second loop antennas 1 and 2 are formed of conductors which are started from a pair of power feeding points 3 installed in one place, distributed and returned to the power feeding points 3 again.
KAMIUMA KOUKEI
MISAWA RYUSUKE
ISHIDA OSAMI
TAKAHASHI IKUO
TAKAYAMA NAOHISA
YAMAZAKI HIROSHI
