A coplanar waveguide-fed broadband circularly polarized microstrip antenna for conformal applications

摘要

A broadband circularly polarized conformal microstrip antenna based oncoplanar waveguide feeding is presented. By embedding a pair of disturbingbranches on a rectangular grounded metal ring and protrudinginto the ring a pentagonal monopole, the measured bandwidths of 3-dBaxial ratio and 10-dB impedance achieve 58.5% (4.6 to 8.4 GHz) and 67.7%(4.3 to 8.7GHz), respectively. The antenna has a small form factor, a lowprofile and low manufacturing costs. Simulated and measured results indicatethat this antenna has excellent adaptability to cylindrical carrierswith different radius, which is adapted for potential conformal applications.In addition, the proposed antenna can find applications in WLAN(5, 5.2, and 5.8 GHz), WiMAX (5.5GHz), and other C-band (4GHz-8GHz)wireless communications.