| 摘要 |
PURPOSE:To attain sure communication even if an opposite mobile station is in any direction by combining a three-element Yagi antenna with a screen reflector whose H plane directivity is smooth and a conventional three-element Yagi antenna while the directivity is inverted by 180 deg. and using a distributer so as to attain split feeding. CONSTITUTION:The H plane directivity of the three-element Yagi antenna 21 with a screen reflector is smooth and has no sub-lohe and the phase change and backward amplitude of the directivity are less, and a conventional three- element Yagi antenna 22 is fitted to said Yagi antenna 21 while the directivity is made different by 180 deg.. A signal power given from a communication equipment (not shown in figure) is supplied to a feeder 21a of the Yagi antenna 21 and a feeder 22a of the Yagi antenna 22 via a coaxial cable 23 in the power ratio of 3:1, for example through a two-distributer 24 and coaxial distribution cables 25, 26 respectively.
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