Broadband Dual-Polarized Cup Dielectric Resonator Antenna With Stable Omnidirectional Radiation Patterns

A broadband dual-polarized cup dielectric resonator antenna (CDRA) with stable omnidirectional radiation patterns is presented in this correspondence. Both omnidirectional horizontally polarized (HP) and vertically polarized (VP) radiation patterns can be attained by exciting electric-dipole/
$T{{M}_{{\text{01}}\delta }}$
mode,
$T{{E}_{{\text{011}} + \delta }}$
mode using a coil feeding structure and a planar feeding network, respectively. The coil feeding structure motivates the CDRA's mode and another equivalent electric dipole at nearby frequency to the CDRA mode to extend the bandwidth. A broadband
$T{{E}_{{\text{011}} + \delta }}$
mode is excited by the planar feeding network using a double-tuned method. The CDRA is
${\text{0.48}}{{\lambda }_{\text{0}}} \times {\text{0.18}}{{\lambda }_{\text{0}}}$
(
${{\lambda }_{\text{0}}}$
is the free-space wavelength at the center frequency). A prototype is fabricated and measured, achieving an HP bandwidth of 14.5% and a VP bandwidth of 29.8%. The overlapping bandwidth is 14.5% (3.26–3.77 GHz). The proposed antenna can be used in various wireless communications.