On the efficiency and gain of antennas
(2013) In Progress in Electromagnetics Research-Pier 136. p.479-494- Abstract
- The fundamental limits of the gain and e±ciency of an
antenna are explored. These are very important quantities for, e.g.,
superdirective arrays. The antenna is in this paper con¯ned in a sphere
and all of the currents are assumed to run in a material with a given
conductivity. It is shown that one can ¯nd the current distribution
in the sphere that optimizes the gain, given the frequency and the
radius of the sphere. The results indicate the distribution of antenna
elements in an antenna array in order to maximize gain, or e±ciency.
The analysis is based on the expansion of the electromagnetic ¯elds
in terms of vector spherical harmonics. Explicit expressions... (More) - The fundamental limits of the gain and e±ciency of an
antenna are explored. These are very important quantities for, e.g.,
superdirective arrays. The antenna is in this paper con¯ned in a sphere
and all of the currents are assumed to run in a material with a given
conductivity. It is shown that one can ¯nd the current distribution
in the sphere that optimizes the gain, given the frequency and the
radius of the sphere. The results indicate the distribution of antenna
elements in an antenna array in order to maximize gain, or e±ciency.
The analysis is based on the expansion of the electromagnetic ¯elds
in terms of vector spherical harmonics. Explicit expressions for the
limits of gain and e±ciency, and the corresponding current densities,
are derived for di®erent types of antennas. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3406242
- author
- Karlsson, Anders LU
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Progress in Electromagnetics Research-Pier
- volume
- 136
- pages
- 479 - 494
- publisher
- EMW Publishing
- external identifiers
-
- wos:000314747900027
- scopus:84873359929
- ISSN
- 1070-4698
- DOI
- 10.2528/PIER12110504
- language
- English
- LU publication?
- yes
- id
- 4e63444d-fe83-457b-a6a7-75101cea5bbe (old id 3406242)
- date added to LUP
- 2016-04-04 07:56:52
- date last changed
- 2022-01-29 02:49:07
@article{4e63444d-fe83-457b-a6a7-75101cea5bbe,
abstract = {{The fundamental limits of the gain and e±ciency of an<br/><br>
antenna are explored. These are very important quantities for, e.g.,<br/><br>
superdirective arrays. The antenna is in this paper con¯ned in a sphere<br/><br>
and all of the currents are assumed to run in a material with a given<br/><br>
conductivity. It is shown that one can ¯nd the current distribution<br/><br>
in the sphere that optimizes the gain, given the frequency and the<br/><br>
radius of the sphere. The results indicate the distribution of antenna<br/><br>
elements in an antenna array in order to maximize gain, or e±ciency.<br/><br>
The analysis is based on the expansion of the electromagnetic ¯elds<br/><br>
in terms of vector spherical harmonics. Explicit expressions for the<br/><br>
limits of gain and e±ciency, and the corresponding current densities,<br/><br>
are derived for di®erent types of antennas.}},
author = {{Karlsson, Anders}},
issn = {{1070-4698}},
language = {{eng}},
pages = {{479--494}},
publisher = {{EMW Publishing}},
series = {{Progress in Electromagnetics Research-Pier}},
title = {{On the efficiency and gain of antennas}},
url = {{http://dx.doi.org/10.2528/PIER12110504}},
doi = {{10.2528/PIER12110504}},
volume = {{136}},
year = {{2013}},
}