| 摘要 |
PROBLEM TO BE SOLVED: To provide a spiral antenna capable of achieving size reduction and good antenna characteristics in a low-range frequency band.SOLUTION: The spiral antenna includes spiral arms 11, 12 and connection sections 13, 14 adjacent to terminal sections of the spiral arms 11, 12 and connected with the spiral arms 11, 12 and is structured to be folded at the terminals of the spiral arms 11, 12, thereby to suppress a reflection wave at the terminal sections of the spiral arms 11, 12, improve antenna characteristics (gain, axial ratio) in a low-range frequency band with a simple structure, and reduce the size of the spiral antenna. |
