Communications: radio wave antennas – Antennas – With variable reactance for tuning antenna
Patent
1995-03-20
1997-04-29
Hajec, Donald T.
Communications: radio wave antennas
Antennas
With variable reactance for tuning antenna
343722, 343747, 343749, 343823, 343878, H01Q 900
Patent
active
056253672
ABSTRACT:
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. Such a variable capacitance antenna can receive and transmit electromagnetic signals on multiple frequency bands and in between frequency bands with high gain, high directivity, high efficiency, and low wind loading.
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Hajec Donald T.
Phan Tho
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