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Performance of a multiband diversity antenna with hand effects

Författare:
Publiceringsår: 2008
Språk: Engelska
Sidor: 478-481
Publikation/Tidskrift/Serie: Proceedings of iWAT2008
Dokumenttyp: Konferensbidrag
Förlag: IEEE Press

Sammanfattning

The implementation of multiband diversity antennas in compact mobile handsets, for the purpose of increasing transmission quality, is a topic of current interest in the mobile phone industry. In order to achieve the expected performance improvement in typical operating conditions, we not only have to contend with the challenges of designing multiple multiband antennas, which are closely spaced within the compact handset and thus strongly interacting with one another electromagnetically 1, we also need to keep in check the electromagnetic interaction between the whole antenna system (i.e., the handset) and the user.
Previous studies have concluded that the presence of a user degrades the mean effective gain (MEG) of the diversity antennas significantly 1-3. Different results have been presented on the effect of the user on the correlation coefficient, no effect 1 and a significant increase of the correlation 2, 3, have been pointed out. However, these studies have been performed on simple single band antennas in talk position. In this paper a more realistic approach is presented by choosing the diversity antenna system to comprise compact versions of PIFA and monopole antennas which cover three WCDMA bands: WCDMA850, WCDMA1800 and UMTS 4. Such compact antennas are easily conformable for small mobile phone products 4. The choice of the bands, as well as the evaluation of the diversity performance for the data mode position, is derived from the increasing demand on HSDPA applications in the mobile phone market.
The investigation of user interaction presented in this paper focuses on the comparison between the free space and data mode diversity performance of a tri-band “stick” phone size prototype in the uniform 3D propagation environment. A state-of-the-art phantom hand from IndexSAR 5 is used to hold the diversity prototype in the data mode position.

Disputation

Nyckelord

  • Technology and Engineering
  • hand effects
  • Multi-band antenna
  • correlation
  • diversity

Övrigt

2008 IEEE International Workshop on Antenna Technology
2008-03-04
Chiba, Japan
Published
Yes
  • Electromagnetic theory
  • Radio Systems
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  • ISBN: 978-1-4244-1523-3

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