Omnidirectional Wideband E-Shaped Cylindrical Patch Antennas

Two novel wideband cylindrical microstrip array antennas (CMAAs) are proposed. They involve two symmetrically located probe-fed E-shaped radiating elements mounted on a cylindrical ground platform. The first design consists of two E-shaped patches located on a textile circular dielectric substrate. The second design involves a radiating element consisting of four strongly coupled E-shaped patches. For both CMAAs, the design has been performed using CST Microwave Studio. In both cases, an omnidirectional radiation pattern (ORP) in the horizontal plane with a deviation of less than 3 dB (maximum over minimum) is obtained. The two antennas are operational at 3.4 and 3.3 GHz with realized bandwidths of 33% and 21% and peak gain values of 2.98 and 4.56 dBi, respectively. A –
10\;dB

sidelobe level is reached in the vertical plane for the second antenna. The CMAA with the higher gain has been fabricated and measured. Above the
–
10\;dB

reflection level, simulations and measurements are in good agreement.