Miniaturized Dual-Antenna System for Implantable Biotelemetry Application

In this letter, a dual-antenna system with enhanced isolation operating at 2.4-2.48 GHz Industrial, Scientific, and Medical (ISM) band for biotelemetry application is presented. Initially, a miniaturized antenna based on T-shaped resonator and shorting via is developed as a primary antenna element. Then, a compact dual-antenna system of size 0.084 λ
₀
× 0.168 λ
₀
× 0.01 λ
₀
is proposed that depicts 8.5% impedance bandwidth. Thereafter, the interelement coupling of the antenna system is significantly reduced (>-37 dB) by employing the neutralization line between the two radiating elements and defected ground structure. A system-level performance of the proposed antenna has also been analyzed for a planar implantable device. Moreover, specific absorption rate of the proposed antenna is evaluated that meets (SAR <; 1.6 W/kg) the health safety requirements. A wireless link budget analysis is performed that satisfactorily fulfills the requirements for high-speed biotelemetry application.