JPS5481757A - Flat type slot antenna - Google Patents

Abstract

PURPOSE:To enable to transmit and receive the circular polarized waves, by taking the arrangement distance n of the slot in continuity with lengthwise the line among a plurality of slots arranged along the feeding strip line as an odd number (in-line wave length x n)/4 and by making orthogonal each electric field. CONSTITUTION:The strip line 13 for feeding is constituted by coating the strip conductor 12 of band shape on one plane of the dielectric substrate 11, and the grounding conductive film 14 is coated on the entire surface of other plane. Next, the long side is arranged and formed in the film 14 having the length of a half wave length coupled with the line 13 and at the both side of the line 13 of two slots A and B while the line 13 is tilted by 45 deg. toward veritcal direction. After that, at the both ends of the line 13, the high frequency source 15 and the termination impedance 16 of equal impedance value almost to the characteristic impedance of the line 13 are connected. The distance l toward length wise of the line 13 of the slots A and B is taken as lambdag n/4 by taking lambdag and n as an odd number, and the distances dA and dB to the center line are made equal.