| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact three-frequency shared antenna, enabling a smaller installation space than a case in which two parasitic elements are disposed in parallel to a dipole antenna on one surface of a dielectric substrate.SOLUTION: A three-frequency shared antenna 100 includes one pair of radiation elements 10a, 10b, 20a, 20b having dipole antennas 10, 20 formed on the surface of a dielectric substrate 3 only. A feeder line 5 is formed on the rear face 3b of the dielectric substrate 3 only, and includes coupling parts 5a, 5b which are formed in parallel to the pair of radiation elements 10a, 10b, 20a, 20b, first parasitic elements 11, 20 and second parasitic elements 12, 22, and capacitance coupled with the pair of radiation elements 10a, 10b, 20a, 20b. The coupling parts 5a, 5b are formed at positions farther from the end part of the dielectric substrate 3 in the width direction, on which the second parasitic devices 12, 22 are disposed, than the second parasitic elements 12, 22. |
