| 摘要 |
PURPOSE:To attain broad band and high gain by providing a waveguide feeding line connecting many holes to a metal or metallized plastic having many holes forming radiation elements. CONSTITUTION:The 1st metallic plate 1 has a recessed hole 3 and the 2nd metallic plate 2 has a hole 4 having the same diameter as the hole 3 and penetrated vertically and having a conical shape at the upper side. In placing the 2nd metallic plate 2 onto the 1st metallic plate 1, they are positioned so as to make the holes 3, 4 coincident. In placing the 2nd metallic plate 2 on the 1st metallic plate 1, a cavity 5 linked to the holes 3, 4 is formed. The cavity 5 forms a waveguide feeding line connecting many holes. Through the constitution above, the feeding phase and power distribution ratio are changed by the line to obtain various directivities. That is, in changing the distance from the feeding part 6 to the radiation element, the phase is changed and the ratio of impedance is changed by making thin or thick at the branched suspended line and the directivity is changed optionally.
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