A Miniature Implanted Antenna for Uhf Rfid Applications

Abstract

In this paper, the design of a miniature antenna dedicated to be implanted in a small animal and intended to work in the European UHF RFID (865-868 MHz) band is presented. One of the goals of this work is the miniaturization of the radiating element while preserving its efficiency to allow a reliable communication between an external interrogating reader and the implanted device. The radiating element is a small rectangular loop antenna associated with a dipole allowing impedance matching. The antenna has dimensions of 2.4 mm × 25.4 mm × 0.5 mm and integrates an Impinj Monza 4 chip presenting an impedance of 5.5 − j74 Ohms at 868 MHz. The antenna is designed and optimized by using the ANSYS HFSS software. The obtained results show a simulated radiation efficiency of 0.7% and simulated total gain of −17.5 dBi. A prototype is realized, and RSSI measurements have demonstrated the possibility of reliable wireless communications between the implanted antenna and an external reader. In addition, Specific Absorption Rate (SAR) calculation indicates that this implanted antenna meets the required safety regulations.

A review of implantable and ingestible antenna for wireless capsule endoscopy system

“…6 (a) and cylinder-conformal microstrip (46). In addition, L. J. Xu et al (13), V. H. Nguyen et al (48), R. S. Alrawashdeh et al (40) had designed the loop antenna for implantable purposes in their biomedical application where the example is shown in Fig. 6 (b).…”

Multilayered Implantable Antenna Biosensor for Continuous Glucose Monitoring: Design and Analysis

“…In [3, 6-9, 11, 13, 14, 18], invasive testing technique was demonstrated. A synthetic blood fluid with various glucose levels was used in [6]; a skin-mimicking gel and tissue model was used [14,18]; a tissue phantom tissue was used in [3,13]; and rat as a model animal was used [7][8][9]. The Invasive or invivo method is considered more reliable as it is less affected by external parameters such as sweat, environmental moisture, temperature, and dust particles.…”