Dual Band-Dual Sense Circularly Polarized Patch Antenna for Wi-Max Application

A rectangular slotted patch antenna with circular rings as parasitic element for accomplishing dual-band dual-sense circular polarization (CP) for wireless application is presented in this paper. The proposed antenna is of compact size having dimension of $31\times 21\times 1.575\mathbf{mm}^{3}$. The dual band is achieved by square patch with multiple slots along with Circular ring like structure on backside. The given antenna consist of two resonating frequency band 4.25 GHz and 5 GHz, while considering return loss as $\mathbf{S}_{11} < -10\mathbf{dB}$ and the 3-dB axial ratio (AR) bandwidth of 1.8% (from 4.18 to 4.257 GHz) and 2.8% (from 4.94 to 5.08 GHz) in lower and upper bands, respectively. The proposed antenna is fabricated and tested experimentally. The measured and simulation results are in agreement.