PURPOSE: To strengthen the connection of a radiation/element and a slot and to prevent the degradation of cross polarized wave characteristics. ;CONSTITUTION: A first power feed substrate 2, a conductor board 3, a second power feed substrate 4 and a radiation circuit board 5 are successively laminated on a conductor board 1 while interposing dielectrics 6-9. A first feeder line 11 is provided on the first power feed substrate 2 while being turned from the central part of one side to a center, and a slot 12 is provided on the conductor board 3 orthogonally to the feeder line 11. Besides, a second feeder line 21 is provided on the second power feed substrate 4 parallelly with the slot 12. The leading part of this feeder line 21 is branched into two parts and positioned on both sides of the slot 12. A conductor board 14 is laminated on the upper face of the radiation circuit board 5 and a radiator 15 is formed at its central part. The slot 12 is arranged almost just under the center of the radiator 15 and power inputted from the first feeder line is coupled at the position of maximum magnetic field.;COPYRIGHT: (C)1996,JPO
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