| 摘要 |
An antenna, which has a plurality of coaxial, generally cylindrical portions interconnected by a plurality of parallel-resonant traps to enable it to transmit or receive signals at one or more relatively high frequencies, is connected to a transmission line by a fixed capacitor, a fixed inductor, and an adjustable inductor which are connected in parallel with each other. That capacitor, fixed inductor and adjustable inductor are located adjacent the lower end of that antenna; and they enable that antenna to continue to transmit or receive signals at the said one or more relatively high frequencies, while also enabling that antenna to receive or transmit signals at a lower frequency - without increasing the overall length of that antenna.
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