Multi-band dipole antenna with matching stubs

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 is of a triangular configuration with a central element running from the apex to the base of the triangle at a substantially perpendicular intersection. A plurality of matching stubs connect from the coaxial fed apex and substantially 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 feed and the first capacitor, providing required circuit Q. A matching end can connect across the feedpoint at a common matching stub point for the swept elements. A plurality of apex fed opposing swept elements positioned on a boom and supported by a mast provides a beam antenna when using a driven element and a reflector element, and additionally a director element as desired. The antenna can be structured to operate on a plurality of frequencies such as 20 meters, 15 meters and 10 meters in the amateur radio spectrum or on any other frequencies as desired in the HF or higher spectrum.