| 摘要 |
PURPOSE:To suppress an unnecessary higher order mode, by providing feeding points of adjacent antennas to location deviating from the center of each antenna in opposite direction. CONSTITUTION:To feeding points P111 and P112 and P121 and P122 which are provided to microstrip antennas 11 and 12, respectively, in such a way that one point is moved by 90 deg. to the center O on each antenna, signals having phase relationships of 0 deg., 90 deg., 90 deg., and 180 deg. are supplied from an electric power distributor 20. Radio waves of circular polarized ones are generated from each microstrip antenna 11 and 12. The distributions of the lowest order mode surface electric currents of the circular polarized waves are the same in phase at both antennas and, therefore, they strengthen with each other. On the contrary, the circular polarized waves due to the distributions of the secondary higher order mode surface electric current at both antennas become opposite in phase and, therefore, they deny with each other. |
