| 摘要 |
A multiple frequency antenna 20 comprises at least one conductor 12, 14, 16, 18 on one side of a printed circuit board 30 and at least one frequency tuning element 22, 24, 26 formed on the other side of the board. The patterns formed by the printed conductors are not limited and may include circles, rectangles and curved or straight lines or preferably continuous hairpin lines. The length of the tuning elements 22, 24, 26 may be one eighth to three eighths that of the resonating elements 16, 14, 18, respectively. The tuning elements 22, 24, 26 may be arranged adjacent to a central region of the resonating elements 12, 14, 16, 18. The antenna 20 may be tuned such that the resonance frequencies of the antenna are within a frequency band such as 210 MHz to 240 MHz. The antenna 20 may be used for transmitting and / or receiving digital signals in a number of different wavebands. |
