DOUBLE ANTENNA

摘要

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 <EMI ID=0.236 HE=6 WI=3 TI=CHI> and <EMI ID=0.237 HE=6 WI=3 TI=CHI> and shield - to wires <EMI ID=0.238 HE=6 WI=3 TI=CHI> and <EMI ID=0.239 HE=6 WI=3 TI=CHI> is connected on side of short vibrators 10 to connection line 1 which two wires <EMI ID=0.240 HE=6 WI=3 TI=CHI> and <EMI ID=0.241 HE=6 WI=3 TI=CHI> in upper part of cloth and two wires <EMI ID=0.242 HE=6 WI=3 TI=CHI> and <EMI ID=0.243 HE=6 WI=3 TI=CHI> in lower part of cloth are interconnected by pairs. Downlead cable 12 which central conductor is connected to wires <EMI ID=0.244 HE=6 WI=3 TI=CHI> and <EMI ID=0.245 HE=6 WI=3 TI=CHI> and shield - to wires <EMI ID=0.246 HE=6 WI=3 TI=CHI> and <EMI ID=0.247 HE=6 WI=3 TI=CHI> is connected on side of long vibrators 2 to connection line which wires <EMI ID=0.248 HE=6 WI=3 TI=CHI> and <EMI ID=0.249 HE=6 WI=3 TI=CHI> and <EMI ID=0.250 HE=6 WI=3 TI=CHI> and <EMI ID=0.251 HE=6 WI=3 TI=CHI> 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.