Design and analysis of miniaturized implantable and wearable microstrip antennas
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[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] There is an increasing effort by hospitals, doctors and healthcare service providers to cut down the ever increasing cost of health care. One area of research in this field is the development of the MBAN system, which enables patient monitoring remotely thus saving costs in hospital stay, doctor visits etc. One area of research is the development of implantable and wearable antennas as a part of MBAN that could be used by saving their collected data in PDAs or any portable device or mainframe computers. In this work, two antenna types, the wearable and the implantable antennas are researched for MBAN applications. The antenna is designed using two different commercial software packages, CST Microwave Studio and HFSS, to validate the results. The first proposed embedded antenna design operates in the WMTS frequency band (608-614 MHz). The antenna performance is tested inside the human body model. The design is later readjusted to get the desired resonant frequency to account for the losses in the body dielectric. The resonant frequency, bandwidth, gain, and radiation pattern of the proposed antenna are provided in this research. In addition, an array of two antennas of the same type has been proposed to increase the system reliability and robustness. The wearable antenna proposed is a Vivaldi shaped Lotus antenna. The antenna was designed using the same software (CST Microwave Studio). The antenna is both multi and broad band. In addition, the antenna can be used for the free allocated band for wide band applications. A flare feeding technique has been used to feed the antenna and meet impedance matching for wide bandwidth. Analysis with bendable materials and different schemes for ground plane, including partial and metamaterials grounds, and flare angles has resulted in an optimized design for the wearable antenna type. Both the antenna design can be used as components for the MBAN systems for medical applications, and can also be used in the commercial and defense sectors.
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