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  • Nyberg, Daniel, 1980-, et al. (författare)
  • Radiation Q and radiation efficiency of wideband small antennas and their relation to bandwidth and cut-off of spherical modes
  • 2007
  • Ingår i: 2nd European Conference on Antennas and Propagation, EuCAP 2007; Edinburgh; United Kingdom; 11 November 2007 through 16 November 2007. - 978-086341842-6 ; :11961
  • Konferensbidrag (refereegranskat)abstract
    • Resonators are traditionally characterized by their quality factor Q, which is inversely proportional to the relative bandwidth. Small antennas are often resonant, so they can be characterized by a Q, except for the fact that the correct quality measure of an antenna is rather the inverse Q. i.e. the relative bandwidth. Still, it has become common to study fundamental size limitations of small antennas in terms of a so-called radiation Q (or antenna Q). The paper explains how this intrinsic radiation Q relates to: i) the bandwidth- efficiency product of small single-resonance-type antennas, ii) the gradual cut-off of spherical waves for wideband gradual-transition-type small antennas, and iii) the number of resonances needed to cover a certain frequency band for wideband multiple-resonances-type small antennas. The paper also introduces one intrinsic radiation Q for basic single TE and TM spherical mode sources, and another for combined TE and TM sources.
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  • Diallo, A., et al. (författare)
  • Diversity characterization of optimized two-antenna systems for UMTS handsets
  • 2007
  • Ingår i: EURASIP Journal on Wireless Communications and Networking. - 1687-1499. ; 2007
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper presents the evaluation of the diversity performance of several two-antenna systems for UMTS terminals. All the measurements are done in a reverberation chamber and in a Wheeler cap setup. First, a two-antenna system having poor isolation between its radiators is measured. Then, the performance of this structure is compared with two optimized structures having high isolation and high total effciency, thanks to the implementation of a neutralization technique between the radiating elements. The key diversity parameters of all these systems are discussed, that is, the total effciency of the antenna, the envelope correlation coefficient, the diversity gains, the mean effective gain (MEG), and the MEG ratio. The comparison of all these results is especially showing the benefit brought back by the neutralization technique. Copyright (c) 2007.
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