Cobalt and copper doped Ni–Zn nano-ferrite with a composition of Ni 0.4 Zn 0.4 Co 0.2 Cu 0.02 Fe 1.98 O 4 are prepared by a coprecipitation method. The structural, electromagnetic and magnetic properties are investigated by means of X-ray diffraction, impedance analyzer and vibrating sample magnetometer, respectively. Samples are calcinated at 600°C and then subjected to different sintering temperatures. After sintering at 900°C for 5h, the average crystalline size is found to be 38nm. The material shows almost constant permeability and permittivity, in the frequency range from 10 to 200MHz, equal to ∼10.8 (loss tangent∼0.04) and ∼6.5 (loss tangent∼0.006), respectively. Relaxation phenomenon takes place beyond 200MHz. The refractive index n is close to 8.3, and the reduced impedance Z/Z 0 is close to 1.3. The persistent and higher value of permeability than that of permittivity along with low losses enables this material useful for the very high frequency applications.