EMI issues in UWB systems

Recent advances in microcircuits and other technologies have resulted in the development of pulsed radar and communications systems with very narrow pulse widths and ultra wide bandwidths. These UWB devices can perform a number of useful radar and communication functions that make them very appealing for both commercial and military applications. UWB Systems are characterized by having either a large fractional bandwidth (Signal Bandwidth ÷ Center frequency must be > ~0.2) or a signal bandwidth exceeding 500 MHz. These systems have very wide information bandwidths, and are capable of performing a number of useful military functions. UWB systems provide potentially superior performance when compared to legacy systems in certain military radio communication and sensing systems functions. The major advantages and disadvantages of UWB systems are related to the bandwidths associated with the ultra-short pulse waveforms that are used in most implementations of UWB technology. Although these ultra-short pulses result in potentially high data rates for communications and high-resolution imaging for radar applications, their associated wide bandwidths, result in the possibility of EMI across a wide range of frequencies. In this paper the author would like to bring out various advantages and disadvantages of UWB Systems and different EMI issues that are encountered with the usage UWB Systems, from the available literature.