A Compact, Omni-directional, Circularly Polarized Microstrip Antenna

摘要

A new type of omni-directional, circularly polarized microstrip antenna employing a zero-order resonator (ZOR) loaded with arc-shaped stubs along the patch is presented. The concept of the proposed antenna uses a configuration of the horizontal magnetic and electric loop currents that act as electric and magnetic monopole antennas, respectively. By adjusting the relevant dimensions of the loaded stubs, an omni-directional, circularly polarized operation can be realized. The operational frequency of the proposed antenna is 1.9 GHz. According to the measured results, the proposed antenna provides a 10 dB input return loss and bandwidth of 11.8 percent. The simulation and measurement radiation patterns show that the proposed antenna radiates the electromagnetic wave omni-directionally. The simulated axial ratios of the proposed antenna indicate that it has a good circular polarization performance.