Title :
Making a telemetry system implantable: Challenges and opportunities in antenna design
Author :
Islam, Shariful ; Esselle, Karu P. ; Bull, David ; Pilowsky, Paul M.
Author_Institution :
Dept. of Eng., Macquarie Univ., North Ryde, NSW, Australia
Abstract :
Design of a proximity coupled implantable planar inverted F-antenna (I-PIFA) is presented. It´s to be operated in the Australian 900MHz ISM band (915-928MHz). This antenna, integrated to an existing Radio Frequency Identification (RFID) tag, will be implanted under the skin of rats for medical research. The main purpose of this wireless telemetry system is to transmit the extracted physiological signals and indicators from the body of the rat to an external RFID reader connected to a computer. The total volume of the antenna is 9.25mm×8mm×3.2mm and the larger ground plane of the RFID circuit board is utilized to improve the performance of the antenna. A skin-fat-muscle planar tissue model has been developed to represent the immediate environment around the antenna, which has been coated with a bio-compatible material. The simulations have shown that the effect of rat skin and the bio-compatible coating on antenna matching is significant. Yet with the conservative antenna design proposed here that has a nominal 10dB return loss bandwidth of 15%, the antenna remain matched over the entire ISM band even if the dielectric constants of the rat skin and bio-compatible coating change over a wide range.
Keywords :
bioelectric phenomena; biomedical telemetry; muscle; permittivity; physiological models; planar inverted-F antennas; prosthetics; radiofrequency identification; skin; Australian 900MHz ISM band; I-PIFA; RFID circuit board ground plane; Radio Frequency Identification tag; antenna matching; antenna performance; antenna volume; biocompatible coating; biocompatible material; conservative antenna design; dielectric constants; external RFID reader; frequency 915 MHz to 928 MHz; immediate environment; implantable telemetry system; loss 10 dB; medical research; physiological signals; proximity coupled implantable planar inverted F-antenna; rat skin; return loss bandwidth; size 3.2 mm; size 8 mm; size 9.25 mm; skin-fat-muscle planar tissue model; wireless telemetry system; Coatings; Materials; Microwave antennas; Permittivity; Radiofrequency identification; Skin; Implantable antenna; RFID reader; RFID tag; biocompatible material; body tissue;
Conference_Titel :
Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO), 2013 IEEE MTT-S International
Conference_Location :
Singapore
DOI :
10.1109/IMWS-BIO.2013.6756246
