| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a dual-band circularly polarized antenna capable of improving the flexibility of applications by being integrated into an antenna module of a limited space. <P>SOLUTION: The present invention relates to a dual-band circularly polarized antenna, more particularly a dual-band circularly polarized antenna for performing transmission and reception at two different frequency bands. Mainly, the dual-band circularly polarized antenna comprises a first polarized antenna element with at least one corner being chamfered, a plurality of second polarized antennas with each of the second polarized antennas having at least one corner being chamfered, a signal distributor for distributing an electrical signal, a signal coupling unit electrically connecting with the first polarized antenna unit, the signal distributor and a ground plate. The dual-band circularly polarized antenna of the present invention not only can be manufactured with a low cost, but also has a simpler structure. Thus, the dual-band circularly polarized antenna of the present invention is integrated into the antenna module of a radio frequency identification system and circularly polarized signals are received and transmitted at two frequency bands. <P>COPYRIGHT: (C)2008,JPO&INPIT |
