| 摘要 |
PROBLEM TO BE SOLVED: To obtain a three-frequency sharing characteristic with space-saving by making this antenna device comprise one combination circuit operating in a 2nd frequency, one hybrid circuit or the like which is connected to the 3rd output terminals of two 3 branching filters and operates in a 3rd frequency. SOLUTION: In 1st and 2nd frequencies, combination circuits 22 and 23 respectively operate in 1st and 2nd frequencies energize array antennas 17a and 17b through 3 branching filters 18a and 18b in each frequency. In such a case, since the circuits 22 and 23 can select an amplitude and a phase in each frequency independently, they can form almost the same beams in width and direction of a horizontal plane in the 1st and 2nd frequencies. According to such a configuration, the characteristics of the conventional two-frequency sharing antenna are realized in the 1st and 2nd frequencies, and an antenna device having main beams in two different directions can be realized in a 3rd frequency.
|
