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

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 $Q$ .

• Author: Andres Alayon Glazunov; Mats Gustafsson; Andreas Molisch
• Department/s: Department of Electrical and Information Technology
• Publishing year: 2011
• Language: English
• Pages: 119-128
• Publication/Series: IEEE Transactions on Antennas and Propagation
• Volume: 59
• Issue: 1
• Links: http://dx.doi.org/10.1109/TAP.2010.2090639
• Document type: Journal article
• Publisher: IEEE - Institute of Electrical and Electronics Engineers Inc.
• Topic: Electrical Engineering, Electronic Engineering, Information Engineering
• Status: Published
• Research group: Electromagnetic theory; Radio Systems
• ISBN/ISSN/Other: ISSN: 0018-926X