Results 211 to 220 of about 7,278 (256)
Some of the next articles are maybe not open access.
IEEE Communications Magazine, 2004
Ultra wideband antennas are specifically designed to transmit and/or receive very short time durations of electromagnetic energy. It is well known that UWB antenna design remains the major factor in the progress of UWB technology. This article describes a study of conventional antennas and why they are not suitable for a UWB system.
Kamya Yekeh Yazdandoost, Ryuji Kohno
openaire +1 more source
Ultra wideband antennas are specifically designed to transmit and/or receive very short time durations of electromagnetic energy. It is well known that UWB antenna design remains the major factor in the progress of UWB technology. This article describes a study of conventional antennas and why they are not suitable for a UWB system.
Kamya Yekeh Yazdandoost, Ryuji Kohno
openaire +1 more source
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2006
A surface acoustic wave (SAW) correlator that satisfies FCC bandwidth requirements for ultra-wideband (UWB) operation has been built and tested. The correlator operates within the 3.1 to 10.6 GHz bandwidth region and uses bi-phase shift keying (BPSK) modulation to achieve a spreading of the main lobe to a 25% bandwidth.
Robert, Brocato +5 more
openaire +2 more sources
A surface acoustic wave (SAW) correlator that satisfies FCC bandwidth requirements for ultra-wideband (UWB) operation has been built and tested. The correlator operates within the 3.1 to 10.6 GHz bandwidth region and uses bi-phase shift keying (BPSK) modulation to achieve a spreading of the main lobe to a 25% bandwidth.
Robert, Brocato +5 more
openaire +2 more sources
Noncoherent ultra-wideband systems
IEEE Signal Processing Magazine, 2009The need for low-complexity devices with low-power consumption motivates the application of suboptimal noncoherent ultra-wideband (UWB) receivers. This article provides an overview of the state of the art of recent research activities in this field. It introduces energy detection and autocorrelation receiver front ends with a focus on architectures ...
Klaus Witrisal +6 more
openaire +1 more source
Ultra-wideband SAR interferometry
IEEE Transactions on Geoscience and Remote Sensing, 1998The authors introduce ultra-wideband synthetic aperture radar (SAR) interferometry as a new technique for topographic height retrieval. It is based on using a SAR system with large relative bandwidth that acquires data along two parallel tracks with a separation of the same order of magnitude as the flight altitude.
Lars M. H. Ulander, Per-Olov Frölind
openaire +1 more source
33rd European Microwave Conference Proceedings (IEEE Cat. No.03EX723C), 2003
The current status of ultra-wideband technology and its main applications such as radars and telecom are presented. The main system approaches for radars and communications are discussed and compared.
openaire +1 more source
The current status of ultra-wideband technology and its main applications such as radars and telecom are presented. The main system approaches for radars and communications are discussed and compared.
openaire +1 more source
Ultra-wideband sources and antennas
Ultra- Wideband Short-Pulse Electromagnetics 4 (IEEE Cat. No.98EX112), 2002Ultra-Wideband (UWB) sources and antennas are of interest for a variety of potential applications that range from transient radar systems to communications systems. In this paper, we discuss the research issues and progress being made in gas, oil and solid state switching, UWB sources, and antennas.
William D. Prather +10 more
openaire +1 more source
Ultra-Wideband and Its Capabilities
BT Technology Journal, 2003Ultra-wideband (UWB) can be seen as a disruptive technology for business and home wireless networking. Research into UWB systems can be dated back to the early 1960s, but until recently the main focus has been on radar-based, military secure radio and intrusion detection systems, as the short pulses of the signal results in very accurate timing ...
X. Gu, L. Taylor
openaire +1 more source
Channel estimation for ultra-wideband communications
IEEE Journal on Selected Areas in Communications, 2002This paper deals with channel estimation in ultra-wideband communications operating in a multipath environment and in the presence of multiaccess interference. The channel parameters are the attenuations and delays incurred by the signal echoes along the propagation paths. Time-hopping modulation with binary symbols is assumed. The estimation method is
LOTTICI, VINCENZO +2 more
openaire +1 more source
Design studies of ultra-wideband microstrip antenna for ultra-wideband communication
2009 Loughborough Antennas & Propagation Conference, 2009This paper presents a circular printed monopole antenna for the Ultra-Wideband (UWB) applications. The antenna achieved over all bandwidth of 120% from operating frequency from 3.1 to 11.5 GHz for return loss
S. Adnan +5 more
openaire +1 more source
IEEE Transactions on Microwave Theory and Techniques, 2007
A method with clear guidelines is presented to design compact planar phase shifters; with ultra-wideband (UWB) characteristics. The proposed method exploits broadside coupling between top and bottom elliptical microstrip patches via an elliptical slot located in the mid layer, which forms the ground plane.
openaire +4 more sources
A method with clear guidelines is presented to design compact planar phase shifters; with ultra-wideband (UWB) characteristics. The proposed method exploits broadside coupling between top and bottom elliptical microstrip patches via an elliptical slot located in the mid layer, which forms the ground plane.
openaire +4 more sources