A Compact Dual Band Implantable Antenna Based on Split-Ring Resonators with Meander Line Slots

In this paper, a dual band implantable split-ring microstrip antenna which operates at MICS (Medical Implant Services) and ISM (Industrial, Scientific, and Medical) bands is proposed for using biomedical telemetry applications. A miniaturized size of 9.5 mm x 9.5 mm x 1.27 mm is accomplished by using three split-ring resonators and meander lines slots on these resonators. There useful paths between resonators is used for optimization. Also, a shorting pin inserted between the patch and ground plane is used for the antenna miniaturization. The proposed split-ring implantable antenna presents 23.5% and 9.3% bandwidth, -48 dB and -24 dB maximum gains, 407 W/kg and 403 W/kg maximum I-g averaged SAR values at the respective bands. In this paper, only numerical results for the proposed design are presented.