Patent ID: 8866685

Claim:
An omnidirectional multi-band antenna comprising: an upper portion including at least one segment having one or more upper radiating elements, one or more tapering features, and one or more slots; a lower portion including one or more lower radiating elements and one or more slots; whereby the one or more slots of the upper and lower portions enable multi-band operation of the antenna and the one or more tapering features are operable for impedance matching; whereby the antenna is operable within a first frequency range, with the lower portion and the at least one segment of the upper portion each having an electrical length of about λ/4; and whereby the antenna is operable within a second frequency range, with the lower portion and the at least one segment of the upper portion each having an electrical length of about λ/2; wherein: the lower portion comprises two generally rectangular radiating elements and a generally rectangular ground element disposed between the two radiating elements, the two radiating elements spaced apart from the ground element by the one or more slots of the lower portion of the antenna, the two radiating elements and ground element generally perpendicular to and connected to a generally rectangular connecting radiating element; and the lower portion comprises a planar skirt element; and/or the lower portion is configured to be operable as a quarter wavelength (λ/4) choke at the first frequency range, such that at least a portion of the antenna current does not leak into an outer surface of a coaxial cable when the antenna is being fed by the coaxial cable; and/or the lower portion is configured to be operable as ground; and/or the lower portion is operable as a sleeve choke at the first frequency range.