Abstract
A compact broadband implantable patch antenna is designed for the field of biotelemetry and experimentally demonstrated using the Medical Device Radiocommunications Service (MedRadio) band (401–406 MHz). The proposed antenna can obtain a broad impedance bandwidth by exciting dual-resonant frequencies, and has a compact structure using bent metal radiating strips and a short strategy. The total volume of the proposed antenna, including substrate and superstrate, is about 479 mm3 (23 × 16.4 × 1.27 mm3). The measured bandwidth is 52 MHz (382–434 MHz) at a return loss of −10 dB. The resonance, radiation and specific absorption rate (SAR) performance of the antenna are examined and characterized.
Highlights
Biotelemetry provides transmission of physiological signals from inside the human body to outside it, or vice versa
An implantable antenna is used in the medical implant communications service (MICS) band (402–405 MHz), which was extended to the Medical Device Radiocommunications Service (MedRadio) band (401–406 MHz) in 2009
We proposed a compact semi-circular implantable antenna by cutting three arc-shaped slots in a semi-circular patch [7]
Summary
Biotelemetry provides transmission of physiological signals from inside the human body to outside it, or vice versa. An implantable antenna is a key component to communicate wirelessly between external equipment and IMDs in a human body [2,3]. Miniaturization is a key requirement for an implantable antenna due to some strict size constraints inside the human body. Kimi et al [4] proposed two compact implanted antennas by using meandered and spiral structures, but they both have a larger size. We proposed a compact semi-circular implantable antenna by cutting three arc-shaped slots in a semi-circular patch [7]. An implantable antenna needs a wide impedance bandwidth to avoid frequency shift due to intersubject variations of the electrical properties of human body tissues and inaccuracies of fabrication and testing. Details of the antenna design and experimental results are presented and discussed
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