An object of the present invention is a small composite antenna that is capable
of operating in a plurality of different frequency bands. A first antenna 2
constituting a GPS circularly polarized loop antenna is formed on a dielectric
substrate 10. A second antenna 3 constituting an ETC square patch
antenna is formed on substantially the same axis as the first antenna 2.
An earth pattern is formed in the underside of the dielectric substrate 10,
and a recess in whose bottom face an earth pattern is formed so as to lie opposite
the second antenna 3 is provided. An arc-shaped feed pattern 4 is
electromagnetically coupled to the first antenna 2 so as to supply electricity
thereto, whereby this antenna is made to operate as a right-handed circularly polarized
antenna. Electricity is supplied by a coaxial cable to the second antenna 3
to cause same to operate as a right-handed circularly polarized antenna.
