Low-profile omnidirectional antenna for automatic dependent surveillance – broadcast applications

A low-profile omnidirectional patch antenna operating in the dependent surveillance - broadcast band is designed for unmanned aerial vehicles. The antenna works at zero-order resonance mode and has an omnidirectional radiation pattern. By loading with vias and double split ring resonator slots, a compact size (0.218 × 0.218 × 0.031 λ₀³) is achieved at 1.09 GHz. The antenna is fabricated and measured. The measured results agree well with the simulated ones. A 20 MHz bandwidth is obtained.