Low-profile wideband dielectric resonator antenna featuring CSRR-enhanced bandwidth and dual narrowband operation

This paper presents a low-profile, compact, and cost-effective wideband dielectric resonator antenna that provides a maximum gain of 5 dBi in the frequency range of 6–7 GHz, with an impedance bandwidth of 15.38%. To achieve wider bandwidth, a complementary split ring resonator (CSRR) has been carved in the ground plane, which aids in the excitation of the TEδ11 and TEδ31 modes. A rectangular air slot has been etched in the dielectric slab of the antenna to improve broadside pattern stability. The antenna is further provided with frequency reconfigurability by employing a single PIN diode. In the ON state of the PIN diode, along with the wideband (6–7 GHz), one narrowband at 2.4 GHz and another at 3 GHz have been excited. In the OFF state of the PIN diode, two narrow bands (5.8 and 6.7 GHz) are excited. The antenna has a dimension of 0.72 λ0 × 0.48 λ0 × 0.071 λ0 (λ0 is calculated at 6 GHz). A prototype has been fabricated and tested, in which measured results show resemblance to the simulated ones.