Outline Definition and limitations of electrically small antenna (ESA) —byL.J.CHU Metamaterial-based efficient ESA(Simulation) -by Richard W.Ziolkowski's group Metamaterial-inspired efficient ESA (Application) -by Richard W.Ziolkowski's group Other groups'workOutline Definition and limitations of electrically small antenna (ESA) ——by L.J.CHU Metamaterial-based efficient ESA (Simulation) ——by Richard W. Ziolkowski’s group Metamaterial-inspired efficient ESA (Application) ——by Richard W. Ziolkowski’s group Other groups’ work