| 摘要 |
PURPOSE:To obtain a small-size and wide-band antenna where impedance matching to a feeder can be facilitated, by piling up plural plate-shaped antennas in parallel at an interval and by making it possible that they are rotated with the part near the feeding part as the rotation axis. CONSTITUTION:Plate-shaped feeding antenna 1 and parasitic antennas 2 and 3 having the same form as antenna 1 are piled up at interval d. Parasitic antennas 2 and 3 are fitted to axis 4 and can be rotated for feeding antenna 1. When rotation angle theta is changed, the mutual coupling between feeding antenna 1 and parastic antenna 2 and 3 is changed to change the feeding point impedance. Therefore, this antenna can select optimum rotation angle theta in the used band to obtain matching, so that the antenna can be used throughout a wide band. |
