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Acknowledgments
This book was the product of many long hours, hard work, and persistence not only by us but also
by our support team.
My thanks go to God for giving me the strength and desire, my family for giving me the moti-
vation, my graduate students for providing the inspiration through their many questions, and my
undergraduate and graduate students for their enthusiasm toward this project and their comments
and their ideas on possible uses in the future.
I especially thank my mother for her view on how older people, though apprehensive of new
technology, see how RF technologies can improve their lives. Our discussions on RF technolo ...