| 摘要 |
PROBLEM TO BE SOLVED: To provide a loop antenna capable of being shared by circular polarization and linear polarization in different frequency bands.SOLUTION: A loop antenna comprises: first and second line conductors 14 and 16 which are arranged so as to extend in parallel at a prescribed distance from each other and have both ends connected electrically; and first and second detour line conductors 18 and 20 which are additionally arranged so as to extend laterally and externally. The loop antenna is: made to function as a dipole antenna for a signal in one frequency band which is formed by the first and second line conductors 14 and 16 and radiates linear polarization; and made to function as a loop antenna for a signal in the other frequency band which radiates circular polarization as a whole, by making the added first and second detour line conductors 18 and 20 or either of the conductors function as a phase delay element for generating predetermined phase delay in part of current in the antenna. Thereby, the circular polarization and linear polarization can be radiated by the one-turn loop antenna. |
