Microwave absorption properties in absorbers for mobile phones

Permalloy composite microwave absorbers mixed with silicone for mobile phones and the effects of the thickness of the samples on the absorption were studied. A permalloy EM wave absorber with the ratio of permalloy : silicon rubber = 60 : 40 wt% showed -3.15 dB, -5.0 dB, -6.09 dB, -4.57 dB and -4.39 dB at 1.8 GHz for 0.7 mm, 1.0 mm, 1.3 mm, 1.6 min and 1.7 min thickness, respectively. We suggest permalloy for use as a EM wave absorber in the S-band and the EM wave absorber fabricated with thickness of 1.3 mm has an absorption ability -6.09 dB in the frequency range of 1.4 similar to 2 GHz.