Effect of rare-earth ytterbium doping on the microwave absorption performance of nickel–cobalt ferrite

When Yb 3+ = 0.02, Ni 0.5 Co 0.5 Yb 0.02 Fe 1.98 O 4 has the best microwave absorption performance, the best reflection loss is −21.04 dB, and the effective microwave absorption bandwidth in the Ku band is 2.55 GHz (15.45–18.00 GHz).