TY - GEN
T1 - Overview of ultrawideband systems
AU - Sarkar, Tapan K.
AU - Mokole, Eric L.
AU - Palma, Magdalena Salazar
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2016/11/2
Y1 - 2016/11/2
N2 - Conventionally, the design of antennas is narrowband and little attention is paid to the phase responses of the devices as functions of frequency. Even the use of the term broadband is misleading as one essentially takes a narrow band signal and sweeps it across the band of interest. In fact, it is not necessary to pay too much attention to the phase for narrowband signals, as the role played by the frequency factor is that of a scalar multiplier. However, if one now wants to use multiple frequencies and attempts to relate the data obtained at each frequency, then this frequency term can no longer be ignored. Depending on the application, this scale factor can actually have significant variations, which also depend on the size and the shape of the bandwidth over which the performance of the system is observed. In the time domain, the effect of this frequency term creates havoc as it provides a highly nonlinear operation and hence must be studied carefully. By broadband we mean temporal signals with good signal integrity. When it comes to waveform diversity, which implicitly assumes time-dependent phenomena, it is not possible to do any meaningful system design unless the effects of the antennas are taken into account. These effects will be illustrated in terms of the responses of the antennas and on the applicability of the current popular methodology of time reversal for the vector electromagnetic problem.
AB - Conventionally, the design of antennas is narrowband and little attention is paid to the phase responses of the devices as functions of frequency. Even the use of the term broadband is misleading as one essentially takes a narrow band signal and sweeps it across the band of interest. In fact, it is not necessary to pay too much attention to the phase for narrowband signals, as the role played by the frequency factor is that of a scalar multiplier. However, if one now wants to use multiple frequencies and attempts to relate the data obtained at each frequency, then this frequency term can no longer be ignored. Depending on the application, this scale factor can actually have significant variations, which also depend on the size and the shape of the bandwidth over which the performance of the system is observed. In the time domain, the effect of this frequency term creates havoc as it provides a highly nonlinear operation and hence must be studied carefully. By broadband we mean temporal signals with good signal integrity. When it comes to waveform diversity, which implicitly assumes time-dependent phenomena, it is not possible to do any meaningful system design unless the effects of the antennas are taken into account. These effects will be illustrated in terms of the responses of the antennas and on the applicability of the current popular methodology of time reversal for the vector electromagnetic problem.
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U2 - 10.1109/ICEAA.2016.7731466
DO - 10.1109/ICEAA.2016.7731466
M3 - Conference contribution
AN - SCOPUS:85007402195
T3 - Proceedings of the 2016 18th International Conference on Electromagnetics in Advanced Applications, ICEAA 2016
SP - 602
EP - 603
BT - Proceedings of the 2016 18th International Conference on Electromagnetics in Advanced Applications, ICEAA 2016
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 18th International Conference on Electromagnetics in Advanced Applications, ICEAA 2016
Y2 - 19 September 2016 through 23 September 2016
ER -