Implantable antenna design and fabrication based on complement split ring elements

With wireless implant systems, it is possible to follow the findings of people who have to live with different disorders and also treat these diseases. In this way, the quality of life of the patients can be increased. Some of the treatments that can be performed with these systems, are pulse rate, monitoring of the sugar level in the blood and body temperature, insulin injections and endoscopy applications. The MICS (402-405 MHz) frequency band has been specially allocated for these applications. The data is exchanged with the MICS frequency band approved by the Federal Communications Commission (FCC) and the system is switched to sleep mode in the ISM (2.4-2.48 GHz) frequency band. In this context, it is desirable that the antennas to be developed for use in biomedical systems have biocompatible, small volume and low output power. When all these requirements are taken into consideration, microstrip antennas are foreground in biotelemetry applications. In this thesis study, a novel antenna design with dimensions of 14 × 14 × 1.27 mm3 was performed for biotelemetry applications. The antenna consists of conductive radiation elements placed on the insulating material and the metal layer forming the soil structure of the antenna. The radiation element of the antenna is composed of split rings. The antenna structure exhibits double-band performance in MICS (402-405 MHz) and ISM (2.4-2.48 GHz) bands. It provides a bandwidth of approximately 20% in the MISC band and 6% in the ISM band. Implant antenna analysis was performed using the CST Microwave Studio program. During the simulation, the antenna was placed in the skin tissue model and in the mouse tissue. In addition, extracorporeal measurements of the antenna were also performed. The antenna was fabricated using print-circuit technology and the return loss measurements were performed in a liquid phantom with human skin texture. Then, the antenna was implanted in the skin tissue taken from the abdomen and the measurements of the return loss were repeated.