Circular polarized dual-band antenna for WLAN/Wi-MAX application

摘要

A novel square ring printed antenna has been suggested for dual-band circular polarizationrn(CP). The geometry contains a square patch and a square ring structure forrndual-band operation. Circular polarization is achieved using triangular cut at thernboundary and right angle bend with inner perturbation. The suggested antenna isrnexcited from the lower layer through electromagnetic (EM) coupling technique. Thernantenna shows good impedance bandwidths of 90 MHz (2.43-2.52 GHz) and 800rnMHz (5.7-6.5 GHz, respectively. The antenna shows 3 dB axial ratio bandwidth ofrn20 MHz at lower band and 120 MHz at upper band with improved gain>6 dBi. Thernsimulated and measured results are well agreed with each other. The antenna is promisingrnwideband operation at the upper band. This antenna was implemented onrnfiberglass reinforcement laminated Arlon substrate with dielectric constantrn(ε_r=2.55), and the overall physical dimension of 30 × 30 × 3.048 mm~3. Therndesigned antenna can be extensibly applicable in WLAN/Wi-MAX communication.rnThe presented antenna is designed using hyperlynx IE3D and the simulated resultsrnare presented.