Abstract
A compact broadband implantable circular patch antenna is designed and experimentally demonstrated for Medical Implant Communications Service (MICS) band (402–405 MHz). Compared with other similar implantable antennas, the proposed antenna incorporates three advantages for biotelemetry communication. First, it can realize a broad impedance bandwidth by exhibiting dual resonances. Second, it can obtain a compact structure by introducing two arc-shaped slots, a rectangular slot and a circular slot on metal radiating patch. Finally, it can display a friendly shape by using a circular structure. The proposed antenna occupies a volume of about 431.5 mm3(10.42× 1.27π mm3), which is a compromise between miniaturization and bandwidth. The measured −10 dB impedance bandwidth is 55 MHz (385–440 MHz). Furthermore, the radiation performance and human body safety consideration of the antenna are examined and characterized.
Highlights
There is a growing scientific interest in implantable biotelemetry communication for monitoring physiological parameters and treating human diseases
A pi-shape with double L-strips planar inverted-F antennas (PIFAs) was proposed for implantable biotelemetry in [8], but this antenna had a relatively large volume
Compared with the rectangular antenna, a circular antenna has more friendly shape [11], and it can avoid injury to human tissues when it is directly exposed to the human body [12]
Summary
There is a growing scientific interest in implantable biotelemetry communication for monitoring physiological parameters and treating human diseases. Designing an implantable antenna inside human body faces many challenges, such as miniaturization, bandwidth, biocompatibility, patient safety, and good radiation performance. In [6], miniaturization of the implantable antenna was realized by etching a meandered slot on the top metal patch with one end open. A pi-shape with double L-strips PIFA was proposed for implantable biotelemetry in [8], but this antenna had a relatively large volume. A novel circular antenna with a single-layer radiating patch is proposed for biotelemetry communication. By properly embedding two arc-shaped slots, a rectangular slot and a circular slot on a circular radiating patch, the designed antenna can realize a compact, friendly, and dualresonant broadband structure. The detailed characteristics and experimental results of this antenna are presented and discussed
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