DOUBLE ANTENNA Russian patent published in 1998 - IPC

FIELD: antenna equipment. SUBSTANCE: invention refers to antennas ensuring operation in two different wave ranges at same time. It may be used in communication systems and in television as room or outdoor receiving or transmitting antenna. Antenna has antenna cloth manufactured in the form of two vertically spaced apart parts anchored on post 13 and connected on two sides to section of four-wire connection line 1 and forming in assemblage log-periodic structure of halves of parallel linear vibrators 2-10 which lengths and distances between which diminish in geometrical progression with period of structure from one end of connection line 1 to other end. Downlead cable 11 which central conductor is connected to wires and and shield - to wires and is connected on side of short vibrators 10 to connection line 1 which two wires and in upper part of cloth and two wires and in lower part of cloth are interconnected by pairs. Downlead cable 12 which central conductor is connected to wires and and shield - to wires and is connected on side of long vibrators 2 to connection line which wires and and and are interconnected by pairs. Manufacture of connection line 1 from four wires and their proper interconnection on sides of short and long vibrators in combination with insertion of second downlead cable connected on side of long vibrators ensure reliable operation of antenna having small dimensions both under mode of metric and decimetric waves. EFFECT: small dimensions and expanded range of working frequencies of antenna. 2 dwg