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Sökning: WFRF:(Pivnenko S)

  • Resultat 1-8 av 8
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  • Azremi, A.A.H., et al. (författare)
  • On diversity performance of two-element coupling element based antenna structure for mobile terminal
  • 2010
  • Ingår i: EuCAP 2010 Fourth European Conference on Antennas and Propagation, Barcelona, 12-16 April 2010.
  • Konferensbidrag (refereegranskat)abstract
    • In wireless communication systems, multipath interference has a significant impact on system design and performance. Fast fading is caused by the coherent summation of one or more echoes from many reflection points reaching the receive antenna. Antenna diversity can be used to mitigate multipath fading. The main challenge of antenna diversity in practical application is the integration of multiple antennas on a small ground plane. Two-element antenna structure based on coupling element antenna concept for diversity application has been studied in previous work and it has shown to be feasible for low frequency diversity application with stable and low envelope correlation across wide frequency range. The studied structure has been tuned to be operating at 1600 MHz for measurement evaluation purpose. This paper presents an analysis of diversity performance of the structure in terms of efficiencies, envelope correlation, and apparent and effective diversity gains in isotropic (i.e. statistically uniform) propagation channel, using spherical near-field technique in an ideal line-of-sight environment (anechoic chamber) and inside reverberation chamber. The envelope correlation is less than 0.1 and the diversity gain is equal to 10.2 dB at 99% reliability level using selection combining technique across simulation and both measurement methods. The measurement techniques are compared to show how accurately the diversity performance of a mobile terminal antenna can be estimated.
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  • Yang, Jian, 1960, et al. (författare)
  • Comparison of two decade bandwidth feeds for reflector antennas: Eleven antenna and quadridge horn
  • 2010
  • Ingår i: EuCAP 2010 Fourth European Conference on Antennas and Propagation, Barcelona, 12-16 April 2010. - 9781424464319
  • Konferensbidrag (refereegranskat)abstract
    • This paper presents a comparison the Eleven Antenna and the ETS-Lindgren quadridge horn in terms of their radiation performance as feeds for reflector antennas. They are both candidates for feeding future radio telescopes for Square Kilometer Array and VLBI2010. The comparison is done by processing measured radiation field functions and input reflection coefficients of both antennas to determine expected reflector antenna performance
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  • Zhang, J., et al. (författare)
  • Characterization of small antennas for hearing aids by several measurement techniques
  • 2010
  • Ingår i: EuCAP 2010 Fourth European Conference on Antennas and Propagation, Barcelona, 12-16 April 2010.
  • Konferensbidrag (refereegranskat)abstract
    • Characteristics of electrically small loop antennas were measured by different techniques and the results were compared in-between. The techniques employed were: a single-probe spherical near-field technique, a multi-probe spherical near-field technique, a reverberation chamber, and a Wheeler cap technique. The results were compared with regard to the measurement accuracy, measurement speed, and applicability for characterization of small antennas in complex application environment.
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  • Resultat 1-8 av 8

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