| 摘要 |
PURPOSE:To cope with circularly polarized waves having two relatively close frequencies by arranging a pair of deforming parts on each micro strip antenna of a composite micro strip one in concentrically aranged micro strip antennas and supplying a high frequency signal to feed points arranged at intervals of a prescribed angle. CONSTITUTION:A 1st micro strip antenna MSA 40 and a circular radiation conductor 53 whose diameter is smaller than the inside diameter of a radiation conductor 43 are provided. A composite MSA consists of a 1st MSA 40 and a 2nd MSA 50 where the conductor 53 is arranged with the same center as the conductor 43. Pairs of deforming parts 46c and 46d and deforming parts 56c and 564 having prescribed areas are formed in open peripheral edges of conductors 43 and 53 at angular intervals of 90 deg. to obtain two-frequency resonance type conductors. A high frequency signal is supplied to feed points 44 and 54, which are arranged on radiation conductors 43 and 53 at prescribed angular intervals to corresponding deforming parts and are at 90 deg. angular interval, with a 90 deg. phase difference. Thus, the composite MSA is obtained which is small-sized and simple and copes with circularly polarized waves having two relatively close frequencies. |
