Design and Evaluation of a Compact Antenna for Implant-to-Air UWB Communication

A compact, printed, capsule-shaped ultrawideband (UWB) antenna for biomedical implants is presented. The 10-dB return loss bandwidth of the proposed antenna is 3.5-4.5 GHz, which covers the recently proposed UWB for biomedical applications. The antenna matching has been optimized using CST Microwave Studio and verified by measurements. An optimized feed mechanism to reduce guided wavelength, as well as integration with other electronics, has been considered in the antenna design. Radiation performance has been evaluated on an impulse-based UWB transmitter/receiver testbed to show that the antenna is usable in biomedical applications, such as capsule endoscopes. The antenna has been tested both in free space and with tissue loading.

[1]  Young Joong Yoon,et al.  Ultra-wide band spiral shaped small antenna for the biomedical telemetry , 2005, 2005 Asia-Pacific Microwave Conference Proceedings.

[2]  Sandeep K. S. Gupta,et al.  Towards a propagation model for wireless biomedical applications , 2003, IEEE International Conference on Communications, 2003. ICC '03..

[3]  Donglin Su,et al.  Design of an Ultra Wideband System for In-Body Wireless Communications , 2006, The 2006 4th Asia-Pacific Conference on Environmental Electromagnetics.

[4]  M A Stuchly,et al.  Dielectric properties of animal tissues in vivo at radio and microwave frequencies: comparison between species. , 1982, Physics in medicine and biology.

[5]  Moo Sung Chae,et al.  A Wideband Telemetry Unit for Multi-Channel Neural Recording Systems , 2007, 2007 IEEE International Conference on Ultra-Wideband.

[6]  Nguyen Thanh,et al.  Wide-Band Coaxial-to-Coplanar Transition , 2007, IEICE Trans. Electron..

[7]  G. Lazzi,et al.  A Comparison of Two and Three Dimensional Dipole Antennas for an Implantable Retinal Prosthesis , 2008, IEEE Transactions on Antennas and Propagation.