Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1986-01-17
1988-11-15
Sikes, William L.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343747, 343818, H01Q 928
Patent
active
047853085
ABSTRACT:
Antenna for operation on a plurality of frequencies, the antenna including apex fed opposing swept elements and a plurality of stubs parallel to a central element, a plurality of capacitors connected between one end of the central element and ends of the stubs, and a coaxial cable connected to the opposing swept elements. Each swept element has a triangular configuration with a central element running from the apex to the base of the triangle at a perpendicular intersection. Plural matching stubs connect from the coaxial fed apex and parallel along the central tube, secured at the other end with clamps or capacitors. Ceramic doorknob capacitors connect between the coaxial fed apex and a free end of the first stub and between the first and second stub ends. A hairpin coil can be utilized between the apex fed and the first capacitor. A matching end can connect across the feed point at a common matching stub point for the swept elements. A plurality of apex fed opposing swept elements positioned on a boom provides a beam antenna when using a driven element and a reflector element, and additionally a director element. The antenna can operate on plural frequencies such as 20 meters, 15 meters, and 10 meters in the amateur radio spectrum or on any other frequencies in the HF or higher spectrum. An inductor and two ceramic capacitors are shunted across the 10M-15M circuitry of the driven element for 12M or 17M operation.
REFERENCES:
patent: 2175253 (1939-10-01), Carter
patent: 2591790 (1952-04-01), Denson
patent: 2640934 (1953-06-01), Lago
patent: 4161737 (1979-07-01), Albright
Butternut Electronic Company
Jaeger Hugh D.
Sikes William L.
Wise Robert E.
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