DESIGN OF BROADBAND CIRCULARLY POLARIZED DIELECTRIC RESONATOR ANTENNA USING IMPROVED FEED NETWORK

The design of a broadband dual-feed type circularly polarized rectangular dielectric resonator antenna is presented. Its feed network is of a switched line structure comprised of a 3-dB Wilkinson power divider and a wideband 90 degrees phase shifter, providing good impedance matching, equal power splitting, and consistent 90 degrees phase shifting over a wide bandwidth. The proposed antenna prototype has been fabricated and measured. The measurements verify that it exhibits advanced characteristics with an impedance bandwidth (VSWR <= 2) of 50.8%, an axial ratio bandwidth (AR <= 3 dB) of 41.7% and a 3-dB gain bandwidth of 45.5%. (C) 2014 Wiley Periodicals, Inc.