Abstract

A broadband omnidirectional distributed antenna is studied theoretically and experimentally. By loading three shorted coupling patches over the top of the radiation patches and a circular sleeve on the ground plane, the bandwidth of the antenna which is excited by a truncated cone feeding structure is significantly enhanced. Results show that an impedance bandwidth of 152% ranging from 0.97 to 7.09 GHz is achieved. Omnidirectional radiation patterns in the horizontal plane, low cross polarisation level, and stable antenna gain ranging from 2.1 to 7.3 dBi are realised over the operating band, which suggests the distributed antenna can be widely used in indoor wireless communication systems.

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