There has been a tremendous rumble in UWB research after the U.S. Federal Communications Commission (FCC) allocated a frequency range with a bandwidth of 7.5 GHz from 3.1–10.6 GHz for UWB applications. Ultra wideband (UWB) technology was earlier limited to special applications, primarily in the military area and there primarily to electronic warfare. The antennas were usually horn antennas or m...

The propagation of ultra wide band (UWB) signals through walls is analyzed. For this propagation studies, it is necessary to consider not only propagation at a single frequency but in the whole band. The UWB radar output signal is formed by both transmitter and antenna. The effects of antenna receiving and transmitting responses for various antenna types (such as small and aperture antennas) ar...

This paper considers the satellite communication systems using the multiband UWB signal format. For terrestrial short-distance high-speed communications, the multiband UWB scheme have been proposed in IEEE 802.15 TG3a and discussion is ongoing at the standardization body. In the multiband UWB scheme, frequency hopping is adopted over 3.1 10.6 GHz, which is regulated by the FCC (Federal Communic...

A new design of Ultra-Wide band (UWB) generator is described in this paper. The UWB impulse generator circuit is the most essential block in a mono-band UWB transmitter. The proposed ultra wide band impulse generator circuit utilizes the performances of the CMOS technology e®ectively, it is composed of a voltage controlled oscillator (VCO), and a rectangular pulse generator (RPG) and mixer. The...

A novel compact, dual layer UWB monopole antenna is presented. This low profile ultrawideband antenna is fed by a 50 Ω shielded strip-line with an array of metal vias making the conducting walls. A printed disc monopole with a circular cut is the radiating element. The dual layer, shielded strip line feed allows for integration in multilayer technologies. The ultra-wideband, monopole characteri...

This work investigates the use of Time Reversal (TR) applied to UWB systems for communication and positioning applications. Potential performance boosts, that are achievable over a single UWB communication link by the sole adoption of TR, are investigated. In the case of multiuser UWB communications, it is shown that TR modifies the distribution of Multi User Interference (MUI) and that further...

For an indoor ultra-wideband (UWB) communication system, the line-of-sight (LOS) between the transmitter and receiver may be frequently blocked by moving people. Blocking of LOS may significantly affect the quality of service of on-going UWB communications. Based on the Angular Power Spectrum Density and the human blocking models, we build a packet-level UWB channel model considering the shadow...

The field strength level of received signal and its statistical distributions are important studies in the wireless communication and network planning. In this paper, we perform numerical solutions of Maxwell equations based on two fast methods of solutions of Method of Moment (MoM) equations, viz multi-level fast multipole method (FMM) [1] and the sparse matrix canonical grid method (SMCG) [1]...

An overview of the propagation characteristics of ultrawideband (UWB) indoor radio channels is presented with an emphasis on the spatio-temporal channel properties. Extensive measurement results are provided and practical considerations are highlighted. The insight into robust UWB communications and sensor networks, provided by channel modeling, is discussed.

High-Speed, Low-Power A/D Converter for a Low-Cost UWB Sub-sampling Radio by Shuo-Wei Michael Chen Doctor of Philosophy in Electrical Engineering and Computer Sciences University of California, Berkeley Professor Robert W. Brodersen, Chair Ultra-Wideband (UWB) technology was approved by the FCC in 2002 and has since drawn considerable attention for a variety of applications, including imaging, ...