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      <title>Radio Science</title>
      <link>http://www.agu.org/journals/rs</link>
      <description><![CDATA[Published during last 7 days for Radio Science]]></description>
      <language>en-us</language>
      <copyright>AGU</copyright>
      <docs>http://blogs.law.harvard.edu/tech/rss</docs>
      <webMaster>webmaster@agu.org</webMaster>
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         <title>Rigorous analysis of the parallel plate waveguide: From the transverse electromagnetic mode to the surface plasmon polariton</title>
         <link>http://dx.doi.org/10.1029/2011RS004838</link>
         <description><![CDATA[This paper presents an analysis of the parallel plate waveguide, based on a hybrid mode formulation. The nonideal metallic conductors of the waveguide are treated as a media characterized by an equivalent permittivity. The frequencies of interest in the presented analysis are at the terahertz band (from 300 GHz to 30 THz), and appropriate models are used for the correct characterization of metallic conductors at these frequencies. The behavior of the electromagnetic field of the fundamental mode is studied in a wide frequency range. At low frequencies (microwave regime) the fundamental mode is the well-known transverse electromagnetic (TEM) mode; as frequency increases, the electromagnetic field changes significantly and a surface wave or surface plasmon polariton (SPP) behavior is observed at the highest frequencies of the terahertz band. This paper shows a unified formulation that explains this transformation in the electromagnetic field behavior.]]></description>
         <author>Carlos A. Leal-Sevillano, Jorge A. Ruiz-Cruz, José R. Montejo-Garai and Jesús M. Rebollar</author>
      </item>
      <item>
         <title>Experimental investigation on channel characteristics in tunnel environment for Time Reversal Ultra Wide Band techniques</title>
         <link>http://dx.doi.org/10.1029/2011RS004893</link>
         <description><![CDATA[The objective of this paper is to investigate the potential advantages of the Time Reversal (TR) technique applied to Impulse Radio Ultra Wide Band (UWB) signals for communications in tunnels. Indeed, in an environment with significant multipaths, it has already been outlined that this technique allows mitigating intersymbol interference and increases the peak power received at a target antenna. However, in a tunnel, as a result of the guiding effect of the structure, the spatial diversity degree decreases as the distance between the transmitter and receiver increases. An in-depth analysis is therefore needed, and we first thus present the main characteristics of the UWB channel deduced from measurements made in a long straight arched tunnel and for a frequency band extending from 2.8 to 5 GHz. In the time domain, waveforms of the impulse radio signal are obtained through an inverse Fourier transform of the measured frequency response and examples are given for different distances varying from 50 m to 500 m. Delay spread and peak-to-peak gain are then studied, depending on the communication range. The case for multiple antenna transmission is also considered.]]></description>
         <author>Concepcion Garcia-Pardo, Martine Lienard, Pierre Degauque, Jose-Maria Molina-Garcia-Pardo and Leandro Juan-Llácer</author>
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