This paper discusses on the UWB carrier frequency generator that is capable of fast switching between different center frequencies. By using a switching network, the different frequencies from different local oscillators are switched within 4ns. A new topology of NMOS switch based on series-shunt configuration is proposed so that it is able to pass the signal from oscillators to output without ...

In this paper, a customised version of iterative identification and control algorithms is presented, oriented to the design of reduced-order controllers with increasing performance (in terms of bandwidth for reference tracking). Although a particular set of identification and control design methodologies is chosen due to its simplicity and wide availability, some of the ideas can be applied to ...

It is proved that the first eigenfunction of the mixed boundary-value problem for the Laplacian in a thin domain Ωh is localized either at the whole lateral surface Γh of the domain, or at a point of Γh, while the eigenfunction decays exponentially inside Ωh. Other effects, attributed to the high-frequency range of the spectrum, are discussed for eigenfunctions of the mixed boundary-value and N...

communication signals is predominant because of the used high frequency (above 10 GHz). The knowledge of statistics of attenuation is very important for planning point-to-point microwave links operating in high frequency band. Describing the statistics of attenuation is possible for instance with fade duration or level crossing rate. In our examination we determine these statistics from one yea...

In this paper an attempt has been made to compute cross-polarization of millimeter waves in the 30-35 GHz frequency range due to rain. Laws and Parson’s drop size distributions for oblate spheroid drops at 20°C ITU-R (2002) model has been used to predict cross-polarization discrimination (XPD) for circular polarization. The study includes a number of earth stations in India, namely, Ahmedabad, ...

Within the next decade intelligent millimeterwave radar systems for vehicular sensor applications in the frequency band from 77 GHz to 81 GHz will be developed in Germany. State of the art in passive and active components of monolithic integrated silicon millimeterwave systems is discussed and the data of already realized components are presented.

In this paper, the intrinsic material properties of human skin via THz Time Domain Spectroscopy have been investigated in a working frequency range from 0.1-1.5 THz. These measured material parameters are utilized to characterize the channel for inbody nano-networks. The sample for spectroscopic study is the real human skin and repeated measurements have provided consistent refractive index and...

Terahertz science and technology is now receiving increasing interest around the world, and materials, devices and systems exploiting this waveband are set to play an important role in a very diverse range of applications. We give an overview of the current status of the technology and its future prospects.

The problems and progress made .in the development of automated methods for the recognition and extraction of urban land use features from LANDSAT digital data of the UK are described. In the data examined so far density slicing in one waveband appears to be almost as effective as multiwaveband classification in selecting the urban areas. While absolute boundaries may be difficult to delineate,...