Circularly polarised printed antenna with conical beam

A new circularly polarised printed antenna concept with conical beam is presented. The proposed concept describes a simple printed structure with an omnidirectional pattern and maximum gain of /spl sim/6 dBi at elevation angles between 30/spl deg/ and 60/spl deg/, with features suitable for various commercial applications. The voltage standing wave ratio is <1.3 and the axial ratio is <2 dB in the 3% operational bandwidth around 4.6 GHz. The experimental results show good agreement with those obtained by simulation.