| 摘要 |
A planar antenna apparatus is disclosed, which includes a monopole antenna with slits. During design, a number of slits are formed on the monopole antenna. The slits are arranged so that a path through the monopole antenna is formed, and the path has sharp turns in alternating directions. In this way, the path of the excited surface current of the monopole antenna is extended, leading to the monopole antenna operating at a lower frequency. Thus, the size of the monopole antenna is reduced as compared with the size of the conventional monopole antenna operating at the same frequency. In addition, the structure of the planar antenna apparatus can be employed for the purpose of polarization diversity. For implementation, two monopole antennas in the above structure are mounted perpendicularly. In this way, the excited surface currents of the respective antennas flow along different directions perpendicular to one another. It leads to the polarization planes and both E-plane and H-plane patterns of the two antennas are perpendicular to each other, fulfilling the purpose of polarization diversity.
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