| 摘要 |
PURPOSE:To prevent unnecessary radiation due to a feeder line and to prevent a radiation loss by forming a exciting element and the feeder line on the same substrate, making it into a triplate constitution, easily obtaining impedance matching, and making approximately the same the aperture of a plane antenna and the exciting element. CONSTITUTION:A conductive plate 1 where the square aperture part is provided and a ground conductive plate 5 constitute a triplate external conductor, and they are at the same potential. A film 4 is set at the center between the conductive plate 1 and the ground conductive plate 5, and on the film 4, a feeder line 2 and a square exciting element 3 are formed by etching, etc. Further, the exciting element 3 is tuned to the aperture part. In addition, the exciting element 3 and the aperture part have approximately the same size. That is, one side of the exciting elements is (0.35 to 0.53)lambda0, and one side of the aperture part is (0.41 to 0.57)lambda0. The lambda0 is a free space wavelength with respect to central frequencies. By making approximately the same the sizes of the aperture part and the exciting element, the rate of the feeder line to be external exposed through the aperture part is made minimal, and the unnecessary radiation from the feeder line is prevented. |
