| 摘要 |
PROBLEM TO BE SOLVED: To facilitate a tuning of frequencies. SOLUTION: This shared antenna for multifrequencies 1 is provided with a helical element 10, and a parasitic helical element 11 which is associated electromagnetically with helical element 10. A tip of parasitic helical element 11 is folded to form a linear return 11a, the length of which is changed to tune the frequency of parasitic helical element 11. At that time, return part 11a is not in dense combination with helical element 10, and frequency tuning can be operated without affecting helical element 10. |
