| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize an antenna for a mobile communication base station 60 deg. sector zone so as to house it in a radome of 100 mm diameter. SOLUTION: Dipole antennas 21 and 22, which are vertically extended with an interval D≈1/4 wavelength kept with respect to a vertical reflector 1, and as for the antennas 21 and 22, a horizontal interval S≈1/2 wavelength, and a vertical interval H≈1/2 wavelength, and they are subjected to common mode feeding. Parasitic elements 41 and 42 are provided at positions that are an interval G≈0.177 wavelength or less, side plane reflectors 51 and 52 which are inclined at an angleθ≈2.0 deg. outwardly from a plane perpendicular to the reflector 1 are provided integrally with T≈0.13 wavelength on both sides of the reflector 1 and the width of the reflector 1 is set W≈0.5 to 0.57 wavelength.
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