摘要 |
A variable capacitance antenna allows individual adjustment of linear resonators on a beam antenna. A linear resonator is associated with each dipole element on a common support boom. A variable capacitance is positioned inside the boom and created using an arrangement of two coaxial conductive tubes as capacitive plates. One of the conductive tubes may be axially moved by a motor using a remote drive control. The movement of one conductive tube relative to the other can vary the capacitance from 0 to 100 picofarads, for example. The variable capacitance antenna can be used for both horizontal and vertical signal polarization applications.
|