Miniaturized, Shared Electric and Magnetic Dipole, Pattern Diversity IoT Antenna for Sub-6 GHz Applications

By using a novel meta-resonator structure, a miniaturized, surface mountable, shared aperture, and hybrid electric/magnetic dipole pattern diversity antenna is proposed for Internet of things (IoT) applications. By exploring the shared electric (E-dipole) and magnetic dipole (M-dipole) structures, a novel T-shaped split-ring resonator (SRR) with even and odd modes is presented and studied by current distributions and equivalent circuits. Broadside and omnidirectional (monopole-like) patterns are achieved by exciting the M-dipole and E-dipole modes of the T-shaped SRR, respectively. To validate the proposed design, this shared aperture metamaterial-inspired pattern diversity antenna with a small size of
$0.295 \lambda_{0}\times 0.0065 \lambda_{0}\times 0.115\lambda_{0}$
is fabricated and measured. The measured overlapped −10 dB bandwidth is from 3.40 GHz to 3.63 GHz (7.0%, covering the LTE B42 band) and the port isolation is greater than 23 dB. Both two modes achieve a good radiation efficiency better than −0.79 dB (>83.0%).