A novel ultra-broadband printed monopole antenna with 10 dB return loss bandwidth from 2.1-21.5GHz is proposed. This printed monopole antenna is constructed using cross-slotted modified circular patch with etched ground plane. This UWB printed monopole antenna is microstrip-fed with a triangular tapered input line for broadband matching.

We propose the use of cooperative communication among single-antenna users to enhance the performance of ultrawideband networks. We consider the amplify-and-forward cooperative protocol in the multiband OFDM setting using practical channel measurements.

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In this paper a multiband UWB signal with polarization diversity is considered in order to maintain as constant as possibile the performance (and consequently the QoS) of a short range communication link.

In this paper we propose a tick time model for dealer quote interactions using ultra-high-frequency data. We include duration functions to measure the time dependence of volatility as well as information. In order to asses price discovery we define several measures in tick time. These measures can be aggregated to calender time and we define a comparative measure to Hasbrouck (1995) information...

The ultra-wideband wireless personal area networks are expected to be most commonly employed in desktop environments. This paper presents a measurement campaign conducted on a typical office desk. A pair of omnidirectional UWB antennas and a vector network analyzer were used to measure the impulse responses over a frequency range spanning from 6 GHz to 8.5 GHz, in accordance with the UWB regula...