Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Patent
1996-09-13
1998-02-17
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
343792, 343901, H01Q 124
Patent
active
057195870
ABSTRACT:
A dual frequency vertical antenna for radiating a first and a second airwave signal in response to a first and a second conducted signal, the first airwave signal having a first frequency and the second airwave signal having a second frequency lower than one-half the first frequency. The antenna includes a horizontal base member and a vertical mast, including a coaxially disposed rod, projecting upward from the base member to a masthead. For feeding the conducted signals, a lower mast extension projecting downward from the base member and a tuning sleeve projecting either upward or downward from the base member are tuned to 1/4 wavelength at the first frequency and a single coaxial cable is connected between the base member and a feedpoint on the rod. The first airwave signal radiates from a dipole formed of an 1/4 wavelength upper rod extension extending upward from said masthead and a concentric 1/4 wavelength upper sleeve external to the mast projecting downward from said masthead. The mast is 1/4 wavelength at the second frequency for radiating the second airwave signal from a dipole formed of the mast and the base member.
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Dorne & Margolin sales literature showing a combination VHF/GPS antenna given a model No. DM CN7-1/A, Nov. 1994.
Gildea David R.
Hajec Donald T.
Phan Tho
Trimble Navigation Limited
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