Release date: 2009-10-12
In vivo medical devices such as radiofrequency pacemakers may be better implanted in the future by implanting fiber antennas.
Researchers at Mary University in London and the Royal Institute of Physics in the UK have developed an implantable radio frequency identification (RFID) technology tag that consists of a planar inverted-F antenna that optimizes the RF effects embedded in the body. The device is essentially a very small RF converter capable of generating RF signals with minimal impact on antenna performance. The antenna was tested in an artificially manufactured three-layer skin, which represents skin, fat, and muscle, respectively. The results show that the fiber system can significantly reduce measurement errors by up to 18 dB, eliminating cable reflection effects, most notably Current measurement error of common mode radiation. The system was tested by the University of Mary's Wireless Sensor Lab.
"This breakthrough can help develop the next generation of micro-human technical devices designed to save more lives," said Dr. Martin Alexander. "A miniature RF optical sensor connects the fiber to the antenna, eliminating unnecessary wiring from the coaxial cable. Radiation-related losses."
Wireless communication with a small charged antenna can excite the common-mode current of the coaxial cable, producing unwanted radiation and propagating and distorting the results.
Shanghai Medical Device Industry Association
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