Prof. Sven Bilen and his colleague Prof. Svetla Jivkova of Pennsylvania State University used their teaching experience from the text and invited student feedback to submit numerous corrections and suggested improvements to factual and conceptual aspects of the book. In addition, their student Mickey Rhoades had a keen eye for errors that went undetected by others. Taken all together, a profound debt of gratitude is owed to the PSU spring 2007 EM course team. Similarly, Prof. Doran Baker and Prof. Donald Cripps at Utah State gathered student feedback and submitted a summary for our reprint consideration. The accuracy checks of problems and their selected answers in Appendix G, plus the improvements to the detailed steps in the Solutions Manual for instructors, are the work of three talented PhD honors students: David Padgett of North Carolina State University, Zhihong Hu of the University of Iowa, and Avinash Uppuluri of vi Utah State University. The feedback of a remarkable undergraduate student who provided a voice to the eyes and mind of the typical neophyte reader must also be acknowledged: David Ristov of South Dakota State University. We like to call our textbook and its supplements "organic" because they are continually growing and being nurtured by those who are passionate about the subject and teaching undergraduates. Using book reprintings and the electronic opportunities of CDs and the internet, our authors and contributors are dedicated to fixing flaws and adding helpful resources whenever they present themselves. We gratefully thank all who share our dedication to the subject, the process, and the delight in learning.
The parameter energy link loss between the source of the transmitter and the load of the receiver is used to evaluate the performance of a ultrawideband (UWB) radio system. The rigorous calculation of the link loss in a UWB system requires a complicated full transient solution for the transmit and receive antennas. However, after involving suitable approximations, the optimization problem is converted to finding a maximum generalized eigenvalue problem. For the special cases of two similar small antennas (dipoles and loops), an analytical method for calculation of the elements of both matrices is developed. These expressions are derived assuming that the receiver load resistance is given, while the transmitter voltage excitation is represented in terms of an orthonormal system of Gauss-Hermite pulses. Appropriate numerical results are presented for two short dipoles and two small loops.
The parameter energy link loss between the source of the transmitter and the load of the receiver is used to evaluate the performance of a ultrawideband (UWB) radio system. The rigorous calculation of the link loss in a UWB system is a complicated task. However, for the special cases of two similar small antennas (dipoles and loops) a simple approximate analytical estimation of this parameter can be obtained. These expressions are derived assuming that the antennas are excited by Gauss-Hermite pulses (GHP). For the first three modes (n = 0, 1, 2) simple formulas for the optimum load resistance are derived.
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