Inventors:
Edward A. Goodman - Dallas TX
International Classification:
H01Q 942
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.