| 摘要 |
PURPOSE: A circularly polarized wave dipole antenna is provided to maintain stable receiving level regardless of polarization direction between the base station and the terminal equipment and prevent interference between neighbor antennas by attaching a reflector plate to the antenna. CONSTITUTION: Horizontally polarized wave dipole antennas(1,2) are installed perpendicularly to vertically polarized wave dipole antennas(3,4) mounted onto a support. The radiation element(4) of 1/4 wavelength is changed in its location. Based on the feeding point, each radiation element is arranged to have length asymmetrical with each other in vertical direction. The impedance difference caused by the adjustment of the position of radiation element is adjusted to be 90 degrees. Thus, the condition for generating circularly polarized wave is satisfied by the arrangement of radiation elements.
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