Ultra wide-band (UWB) systems have recently attracted much research interest owing to their appealing features in short-range mobile communications. These features include high data rates, low power consumption, multiple access communications, and precise positioning capabilities. Space-time coding techniques, such as the block coding scheme or the trellis coding scheme, are known to be simple ...

Today’s data rates in wired networks can reach 100 Gbit/s using optical fiber while data rates in wireless networks are much lower tens of Mbit/s for 3G mobile communication and 480 Mbit/s for ultra-wideband (UWB) short range wireless communications. This difference in data rates can mainly be explained by the limited allowed frequency spectrum, the nature of the radio signal and the high requi...

The Micro strip patch antenna (MPA) plays a major role in communications. This article deals with the broad review of Micro strip patch antenna design parameters, various slots for different applications i.e. designs, development of output factors etc. In this modern world a dual band and triple band antenna with notch characteristics plays a vital role in wireless communications like UWB, WLAN...

A microstrip elliptical patch antenna was designed on liquid crystal polymer substrate for ultra wide band wireless communications. The proposed ultra wide band antenna simply consist of an elliptical patch with coaxial feeding and liquid crystal polymer substrate of 3.16 permittivity and 0.004 dielectric loss tangent placed on the ground plane. At operating frequencies of 4.5, 6, 8 GHz, the pr...

Band-notch characteristic has been of great interest recently to overcome the electromagnetic interference of Ultra-wideband systems (UWB) with other existing ones. In this paper, we present a novel microstrip-fed antenna with band rejection property appropriate for UWB applications. Band-notch characteristic has been achieved by adding a rectangular resonant element to the ground section. A pr...

In this paper we propose and evaluate the performance of the time reversal technique in impulse radio UWB communications. The evaluation was based on measured channel impulse responses in the UWB frequency band of 3 to 5 GHz of a 4x1 MISO system with both vertical and horizontal polarization at the receiver. The results show that there is a great potential in combining time reversal and UWB tec...

Ultra Wideband (UWB) radio system is an emerging wireless radio technology. It can transmit digital data over a wide spectrum of frequency band with very low power. This paper presents an analysis of UWB technology on direct millimeter wave six-port receiver, to be designed as an application-specific integrated receiver using Frequency Diversity Spread Spectrum (FDSS) technique. With wideband s...

The need for development of microstrip patch antennas for ultra-wideband (UWB) communications has been very well recognized.UWB antennas are mainly used for wearable MIMO sytems,weather mesurements and also UWB radar applications. Patch antenna can be a good choice for handheld devices in UWB applications.There was a great success in finding a suitable structure for mobile applications.This pap...

The frequency hopping (FH) based ultra-wideband (UWB) communication system divides its available frequency spectrum into several sub-bands, which leads to inherent disparities between carrier frequencies of each sub-band. Since the propagation loss is proportional to the square of the transmission frequency, the propagation loss on the sub-band having the highest carrier frequency is much large...