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On the Physical Limitations of the Interaction of a Spherical Aperture and a Random Field
KTH, School of Electrical Engineering (EES). Lund University, Sweden.
2011 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 59, no 1, 119-128 p., 5618544Article in journal (Refereed) Published
Abstract [en]

This paper derives physical limitations on the interactions of antennas exciting TM or TE modes (but not both) and wireless propagation channels. The derivation is based on the spherical vector wave expansion of the electromagnetic field outside a sphere circumscribing the antennas. The result is an extension of the seminal work of Chu on the classical limitations on maximum antenna gain and radiation Q. Rather than maximizing antenna gain in a single direction we obtain physical limitations on the antenna gain pattern, which is directly translated to more condensed parameters, i.e., the instantaneous effective gain G(i) and the mean effective gain G(e) if instantaneous realizations or correlation statistics of the expansion coefficients of the electromagnetic field are known, spectively. The obtained limitations are on the maximum of G(i)/Q and G(e)/Q, which establish a trade-off between link gain and Q.

Place, publisher, year, edition, pages
IEEE , 2011. Vol. 59, no 1, 119-128 p., 5618544
Keyword [en]
Mean effective gain, physical bounds, quality factor, spherical vector waves
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications
URN: urn:nbn:se:kth:diva-31009DOI: 10.1109/TAP.2010.2090639ISI: 000286008300013ScopusID: 2-s2.0-78651269751OAI: diva2:402757

QC 20110309

Available from: 2011-03-09 Created: 2011-03-07 Last updated: 2016-04-28Bibliographically approved

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Alayon Glazunov, Andres
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