| 摘要 |
PROBLEM TO BE SOLVED: To provide a small, light and inexpensive diversity antenna with high performance by constituting a main antenna and a sub-antenna, to be arranged on an identical substrate so as to prevent mutual interference. SOLUTION: An antenna exciter 3 resonating atλ/4 on one surface of an antenna substrate 1 is coupled electrostatically with a strip-like antenna element 2, resonating atα/2 on the other surface by means of a minute electrostatic capacitance coupling C, wherein power is fed to the antenna exciter 3 by a coaxial cable 7 m in which an external conductor is connected to a strip-like ground plate 4 with aλ/4 electric length, thus a main antenna M is constituted. A grounded plate 4' is arranged in a base end part on one surface of the substrate 1, a patch antenna 5 resonating atλ/2 is formed to face opposite to it over the substrate 1, and power is fed from a point with a coaxial cable 7S where the external conductor is connected to the grounded plate 4'. Thus, the main antenna M and the sub-antenna S share the substrate 1 being arrange in a column and connected integrally. Then, the main antenna coaxial cable 7 m is arranged in parallel with the grounded plate 4' of the sub-antenna S.
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