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On the physical limitations of the interaction of a spherical aperture and a random field

In English

Författare

Summary, in English

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 $G_{rm i}$ and the mean effective gain $G_{rm e}$ if instantaneous realizations or correlation statistics of the expansion coefficients of the electromagnetic field are known, respectively. The obtained limitations are on the maximum of $G_{rm i}/Q$ and $G_{rm e}/Q$, which establish a trade-off between link gain and $Q$ .

Publiceringsår

2011

Språk

Engelska

Sidor

119-128

Publikation/Tidskrift/Serie

IEEE Transactions on Antennas and Propagation

Volym

59

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

IEEE - Institute of Electrical and Electronics Engineers Inc.

Ämne

  • Electrical Engineering, Electronic Engineering, Information Engineering

Status

Published

Forskningsgrupp

  • Electromagnetic theory
  • Radio Systems

ISBN/ISSN/Övrigt

  • ISSN: 0018-926X