| 摘要 |
PROBLEM TO BE SOLVED: To provide an array antenna that facilitates impedance matching in a wide band.SOLUTION: An array antenna is composed of a main cable 32, a sub-cable 33 and a plurality of antennas 130. In (a), where two antennas 130 are used in a combination, transmission signals of the same phase are supplied in parallel via the sub-cable 33 branching from the main cable 32, the impedance of the sub-cable 33 and the input impedance of the antennas 130 are set to 2×Z with respect to the impedance Z of the main cable 32. In (b), in a case where three antennas 130 are used in a combination, the impedance of the sub-cable 33 and the input impedance of the antennas 130 are set to 3×Z. In (c), and in a case where N number of antennas 130 are used in a combination, the impedance of the sub-cable 33 and the input impedance of the antennas 130 are set to N×Z. |
