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time domain, according to Formula BW×T ≥4/π, which expresses the connection between bandwidth (BW) and pulse duration (T). For traditional communication technologies such as WiFi, bandwidths are limited to e.g. 20 MHz, resulting in a pulse width larger than 4 nanoseconds. In contrast, UWB systems of 500 MHz have time pulses of only 0.16 ns ...
In this paper, the Transmission-Line Matrix (TLM) method in the time domain is utilized to determine the group delay of two printed circuit UWB antennas. The first one is a recently developed, new coplanar-waveguide antenna [27], the second a publishedmicrostripantenna[9,10]withsofarnoinformationaboutphasevariations. 2 Coplanar UWB Antenna.
UWB communication is achieved by sending ultra-short, time-domain pulses in predefined bursts and sequences to achieve different functionalities. A single pulse can be less than 1ns long, which results in a very large bandwidth in the frequency domain.
The use of very short RF pulses. Since short pulses have very wide frequency bandwidth, it is termed “Ultra WideBand” or “UWB”. FCC defines UWB as a 10 dB bandwidth > 500 MHz or > 20%. TDC’s systems are typically > 2 GHz and > 60%. Actual UWB Pulse and Its Spectrum.
In the first part of this section, we will demonstrate the time-domain calculation of the group delay and amplitude variation at the example of the coplanar UWB antenna presented in Sect.4.2.
In this introductory chapter, we reviewed the history, background, and basic concepts of UWB communications. We identified the major advan-tages and challenges of this emerging technology and reviewed the funda-mental differences between narrowband, wideband, and ultra-wideband communications.
In this paper, the time domain modelling of an indoor impulse UWB GPR systems (1GHz-5GHz), built in the scope of the HUDEM project, is presented. For an impulse UWB system, a time-domain modelling is an obvious choice.
