The RF characteristics of carbon nanotube coated Permalloy nanorod array in porous anodic aluminum oxide were evaluated using coplanar waveguide. The average diameter and length of the Permalloy nanorods was ∼ 10 nm and ∼ 500 nm, respectively. The signal attenuation of the Permalloy nanorod array was 22.4 dB/cm at 20GHz (stop-band frequency), which was higher than that of 0.5 μm-thick NiZn-ferrite film (15.5 dB/cm). In the pass band frequency region at around 1 GHz, the magnitude of signal attenuation of the Permalloy nanorods array exhibited about 0.5 dB/cm. It is lower than that of the NiZn-ferrite film of 1.2 dB/cm. The propagation wavelength shortening was obtained by NiZn ferrite (60 %) and carbon coated Permalloy nanorod (46.2 %) at 1 GHz.