| 摘要 |
PROBLEM TO BE SOLVED: To attain stable and high quality radio relay even in a channel or a tunnel and to make the size small and the weight light. SOLUTION: The system is provided with reception antennas 21, 23, a transmission antenna 22, and a height adjustment device 28 consisting of an antenna mount plate 24, a spherical seat 25 to adjust the height of the transmission antenna 22, an adjustment bolt 26 and a guide 27. The reception antenna 21 and the transmission antenna 22 are made up of a 2-element right-handed rotatory polarized wave microstrip path element, and the reception antenna 23 is made up of a 2-element left-handed rotatory polarized wave microstrip path element. The reception antennas 21, 23 conduct the circularly polarized wave diversity reception using a right-handed rotatory polarized wave and a left- handed rotatory polarized wave. The reception antennas 21, 23 and the transmission antenna 22 are directly mounted on the antenna mount plate 24 at an interval of 1λ respectively. The transmission antenna 22 is mounted by a height of about 1/4λ via the height adjustment device 28. Furthermore, a feeding connector 29 is provided to the reception antennas 21, 23 and the transmission antenna 22. |
