Patent ID: 6859176

Claim:
A dual-band omnidirectional antenna for wireless Local Area Networks (LANs), comprising: a planar dielectric substrate with first and second surfaces parallel with each other; a first conductive pattern arranged on a first surface of the substrate, and provided with a first feeder line arranged on a longitudinal central line of the substrate and a plurality of radiating elements which are formed to be bent, which have one ends connected to the first feeder line, and which are designed such that some of the radiating elements operate in a high frequency band, and others thereof operate in a low frequency band; and a second conductive pattern arranged on the second surface of the substrate, and provided with a second feeder line arranged on a longitudinal central line of the substrate and a plurality of radiating elements connected to the second feeder line and up-down symmetrically arranged with respect to the radiating elements on the first conductive pattern, wherein a coaxial transmission cable having an external conductor and a core is provided to the antenna in a relation in which the external conductor comes into contact with a ground part on the first feeder line, and the core comes into contact with the second feeder line.