GB1145507A - Dipole aerial - Google Patents

Abstract

1,145,507. Aerials. RAYTHEON CO. 29 July, 1966 [2 Aug., 1965], No. 34134/66. Heading H4A. An aerial comprises a dipole fed by a two conductor quarter-wave transmission line, the arrangement being such that the two sections of the dipole are located in different parallel planes, with a spacer separating them and also the two conductors of the transmission line. As described, a plastics disc 50 has printed or otherwise deposited on its upper face the sections 18, 22, 26 of three dipoles 10, 12, 14 and on its lower face their other sections 16, 20, 24. The dipoles are disposed symmetrically around the periphery of the disc 50, to obtain a horizontally omni-directional radiation pattern, and they are joined to central rings 34, 58 by means of quarter-wave transmission lines 29, 31, 33 comprising upper conductors 28, 30, 32 and lower conductors 52, 54, 56. Other quarterwave transmission lines 39, 41, 43, which extend, from the rings 34, 58, between the lines 29, 31, 33 and are short-circuited by wires 45, 47, 49 passing through the disc 50, thus providing symmetrical direct-current return paths, are stated to improve the radiation pattern of the aerial. A coaxial cable has its inner conductor passing through a hole 36 in the disc and connected to the upper ring 34, its outer conductor being connected to the lower ring 58.