| 摘要 |
PURPOSE:To reduce a circuit loss due to a feeder line, and to increase antenna gain by providing the end part of a waveguide circuit and the boundary wall surface of a conductor substrate with a slot opening part, and electromagnetic- coupling the slot opening part and a strip line, and simultaneously, making a connection part be of minimum thickness. CONSTITUTION:A feeder layer conductor pattern is printed and formed on the insulating material sheet 14 of a feeder line layer 7 together with a large number of coupled radiation elements 15. The circular patch-shaped radiation element 15 is provided with notched parts 16, 16 at a conductor circumferential part, and is power-supplied from the strip line 17, and generates a circularly polarized wave. The slot opening part 4 is formed into a slender groove shape at a position away from the position directly below the antenna radiation element, and thus, the waveguide and the strip line can be electromagnetic-coupled without disturbing an antenna arrangement. Further, the strip line whose line width of the open end part of a strip line connecting part is increased so that length from the open end of the strip line to the slot opening part of the maximum current can be shortened is connected to a feeding strip line 25. |
