| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a highly reliable composite antenna which is constituted by combining a circular polarization wave antenna with a vertical polarization antenna and is suitably miniaturized and made thin. <P>SOLUTION: A flat antenna 11 being a vertical polarization antenna for a ground wave is fixed on a printed board 10, and a patch antenna 12 being a circular polarization wave antenna for a satellite wave is placed and fixed on a metallic plate 14 of the flat antenna 11. A power feeding pin 23 of the patch antenna 12 is connected to the power feeding line of a coaxial cable 31 by using an opening 13 of the flat antenna 11. Also, the relative positional relation of the metallic plate 14 to the patch electrode 21 is set so as to be almost uniform along the peripheral direction. Thus, it is possible to reduce the heightwise dimension or planar size of the whole composite antenna, and to prevent the collapse of non-directional properties within an azimuth face due to the electromagnetic coupling of the flat antenna 11 to the patch antenna 12. <P>COPYRIGHT: (C)2004,JPO |
