An object of the present invention is to provide a small composite antenna that
is capable of operating in a plurality of different frequency bands. A GPS first
loop antenna 2 is formed on a dielectric substrate 10. A VICS radio
wave beacon second loop antenna 3 is formed on substantially the same axis
within the first loop antenna 2. In addition, an ETC patch antenna 4
is formed in the bottom face of a recess 12 provided substantially in
the center of the dielectric substrate 10. An earth pattern is formed over
the whole of the underside of the dielectric substrate 10. An arc-shaped
first feed pattern is electromagnetically coupled to the first loop antenna 2
so as to supply electricity thereto and cause same to operate as a right-handed
circularly polarized antenna. An arc-shaped second feed pattern is electromagnetically
coupled to the second loop antenna 3 so as to supply electricity thereto.
Electricity is supplied by a coaxial cable to the patch antenna 4 to cause
same to operate as a right-handed circularly polarized antenna.
