휴대폰 헬리컬 안테나 내부의 페라이트 비드에 의한 SAR감쇠 효과

SAR Reduction of Cellular Phone Terminals with the Ferrite Bead inside of the Helical Coil

We are proposing a new mobile phone antenna, which has a specially manufactured Mn-Zn cylindrical ferrite bead inside of the helical coil of the antenna. The extended antenna radiation patters and the spatial peak SAR averaged over 1 gram simulated tissue with and without the ferrite bead insertion were measured at 824 MHz. The results show that the ferrite bead resulted in SAR reduction about 20 %, and reflection coefficient increase about 7 % for the extended antenna. The applicability of this scheme to the antenna mass production is quite feasible.