A Dual-Band Circular-Polarized Dielectric Loaded Antenna (DLA)

We present a circular-polarization design of the dual-band Dielectric Loaded Antenna (DLA) for indoor access point applications. The DLA is different from the conventional DRA by inserting air gap between the dielectric resonator and the ground plane, which offers more degrees of design freedom and wider bandwidth. The proposed box-matched DLA propossess two wide-bands operation on 3.36-4.47 GHz (28.3%) and 4.60-6.78 GHz (38.3%), and keeps a 3 dB boresight axial ratio on 3.72-4.25 GHz (13.2%) and 5.45-5.85 GHz (7.08%). Consistant, direcitonal radiation performance and antenna gain (4.7-6.5 dBi) over the two frequency ranges have been obtained. A simple fabrication process is employed, making the proposed DLA a low-cost candidate for indoor access point.