Hybrid cylindrical dielectric resonator antenna with monopole for tri-polarized operation

A wideband tri-polarized antenna is presented in this letter. The proposed hybrid structure consists of a cylindrical dielectric resonator (DR) and a copper cylinder. Tri-polarized operation is achieved by exciting the HE_11δx and HE_11δy modes of the DR, and the λ/4 monopole mode of the copper cylinder. The resonant frequency of the monopole mode is well tuned to work cooperatively with the two HE_11δ modes. Only one single substrate layer is required to integrate the three balanced feedings. A prototype of the proposed antenna is built and tested. The measured overlapping impedance bandwidth of the three ports is 410 MHz (2.38-2.79 GHz), and the isolation among the three ports is also less than -27 dB across the bandwidth.