| 摘要 |
PURPOSE:To reduce the variation in amplitude of a radiation pattern, and also to miniaturize a non-directional antenna with circular-polarization antenna elements with a cavity arranged, by shaping the cavity into a truncated pyramid. CONSTITUTION:At the circumference of the non-directional antenna which has several cavity circular-polarization antenna elements arranged at its circumference, spiral antenna elements 4 with cavity in a truncated pyramid are arranged, thereby constituting the circular-polarization non-directional antenna. The antenna of this constitution is provided with rectangular spiral radiation conductors 3a to 3d, feeders 4a to 4c supplying radio waves to radiation conductors 3a to 3d are connected, and dielectrics 2a to 2d are fitted to the opening terminal of cavity 5. In this constitution, the amplitude variation of the radiation pattern can be reduced and the antenna can also be miniaturized. |
