Circularly polarized dielectric resonator‐loaded circular microstrip patch antennas for WLAN 2.4 GHz applications

Dielectric resonator-loaded circular microstrip patch antennas can be used as an alternative way to generate circular polarization. The dielectric resonator is placed on the edge of the circular microstrip patch antenna to result both strong coupling effect and two degenerated orthogonal modes. Then, we choose the feeding point, the placed position and size of DR, and the height of antenna as key tuning parameters; both wide circular polarization and impedance matching are achieved. Application is given for WLAN 2.4 GHz band. Both simulated and measured data are matched well. Measured results show that the center frequency is at 2.45 GHz. The impedance bandwidth is 19.2%. Besides, the axial ratio bandwidth is 3.7% (2.39–2.48 GHz). The radiation patterns are broadside radiations and high antenna gain of 8.6 dBic is achieved. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1470–1473, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24373