Communications: radio wave antennas – Antennas – With lumped reactance filter in active antenna
Patent
1996-01-25
1998-11-10
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With lumped reactance filter in active antenna
343752, 343828, 343830, H01Q 942
Patent
active
058350675
ABSTRACT:
A physically short broad-bandwidth multiband vertical antenna with 50 ohm input impedance and 25 foot square footprint for 160, 80, 40 and 17 meter radio bands. Low ohmic resistance due to the small physical size combined with system impedance transformation and capacitive input coupling provide radiation resistance corresponding to an efficiency of about 85 percent. The 2:1 SWR bandwidth is 50 kHz on 160 meters and 87 kHz on 80 meters. A 30 foot mast, top hat capacitive load, and a plurality of parallel vertical skirt wires depending from the top hat around the mast are electrically connected together at the top of the mast. An impedance transforming multi-tap coil is connected between mast and ground. Skirt wires are in two sets separately fed at their lower ends by separate coaxial cable coupling capacitors for operation on different bands. A 50 ohm feed line, skirt wires, coupling capacitors and impedance transforming coil all have terminal connections on a mast-base insulator. End-pruning of coaxial cable capacitors combined with coil tap selection tunes the antenna for desired portions of the 160 and 80 meter bands for input impedance matching without additional matching devices. Skirt wire sets, downwardly tensioned and spaced from the mast, are connected to input capacitors by separated crossed metal spreaders at the mast-base insulator. Additional reactance-reducing components facilitate improved operation at 40 meters. More independent center frequency tuning for both 160 and 40 meter bands is obtained by connecting the impedance transformation coil from ground to a higher point on the mast via an additional skirt system.
REFERENCES:
patent: 3482249 (1969-12-01), Mullaney
patent: 3484787 (1969-12-01), Vallese
patent: 3521169 (1970-07-01), Turner et al.
patent: 3967276 (1976-06-01), Goubau
The CTSVR Uni-Hat Antenna McCoy, Lew; CQ, Dec., 1994, pp. 24, 26-28.
Freudenberg Kenton L.
Freudenberg Maxwell C.
Wimer Michael C.
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