| 摘要 |
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.
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