Dual-Band and Dual Polarized Inverted Pentagonal Shaped Hybrid Cylindrical Dielectric Resonator Antenna for Wireless Applications

This article presents a dual-band dual-polarized, slotted cylindrical dielectric resonator antenna (CDRA) for wireless applications. Multiple inverted pentagons with slotted aperture are used to radiate hybrid mode HEM11 delta. The suggested radiator has two operating frequency bands: lower frequency band is from 3.75 to 3.96 GHz with 5.44% (210 MHz) fractional bandwidth resonating at 3.87 GHz while upper frequency band is from 6.58 to 8.4 GHz with 24.29% (1820 MHz) fractional bandwidth resonating at 6.63 GHz. The lower resonating band is generated because of multiple slots while upper resonating band is due to the combination of CDRA and multiple slots. The lower band is linearly polarized whereas the upper band is dual-polarized (linear/circular). Circular polarization (CP) characteristic is achieved at the upper frequency band by combining the effect of moon-type microstrip line and multiple slots. Axial ratio bandwidth (3-dB) is obtained about 7.06% (550 MHz) between 7.52 and 8.07 GHz with 0.62 dB minimum AR value at frequency 8.01 GHz. This radiator can be used in partially S and C-band applications.