Theoretical Limitation of the Radiation Efficiency for Homogenous Electrically Small Antennas
Summary :
Maximum radiation efficiency has been derived for homogeneous electrically small antennas. The spherical wave expansion is utilized to express the radiated field and the current distribution on an antenna, and the radiation efficiency is represented by the current, which is expressed in the spherical wave expansion coefficients and the nonradiating current. By using a concept of the nonradiating current, it is shown that the maximum radiation efficiency is achieved if the antenna shape is spherical. The radiation efficiency of a spherical antenna is maximized by varying the expansion coefficients. This radiation efficiency is compared with that of the antenna which achieves the maximum gain and those of linear antennas. The comparison indicates the validity of our proposed upper limit of the radiation efficiency.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E98-C No.1 pp.2-7
- Publication Date
- 2015/01/01
- Publicized
- Online ISSN
- 1745-1353
- DOI
- 10.1587/transele.E98.C.2
- Type of Manuscript
- Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
- Category
Authors
Keisuke FUJITA
Chuo University
Hiroshi SHIRAI
Chuo University
Keyword
Latest Issue
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Keisuke FUJITA, Hiroshi SHIRAI, "Theoretical Limitation of the Radiation Efficiency for Homogenous Electrically Small Antennas" in IEICE TRANSACTIONS on Electronics,
vol. E98-C, no. 1, pp. 2-7, January 2015, doi: 10.1587/transele.E98.C.2.
Abstract: Maximum radiation efficiency has been derived for homogeneous electrically small antennas. The spherical wave expansion is utilized to express the radiated field and the current distribution on an antenna, and the radiation efficiency is represented by the current, which is expressed in the spherical wave expansion coefficients and the nonradiating current. By using a concept of the nonradiating current, it is shown that the maximum radiation efficiency is achieved if the antenna shape is spherical. The radiation efficiency of a spherical antenna is maximized by varying the expansion coefficients. This radiation efficiency is compared with that of the antenna which achieves the maximum gain and those of linear antennas. The comparison indicates the validity of our proposed upper limit of the radiation efficiency.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E98.C.2/_p
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@ARTICLE{e98-c_1_2,
author={Keisuke FUJITA, Hiroshi SHIRAI, },
journal={IEICE TRANSACTIONS on Electronics},
title={Theoretical Limitation of the Radiation Efficiency for Homogenous Electrically Small Antennas},
year={2015},
volume={E98-C},
number={1},
pages={2-7},
abstract={Maximum radiation efficiency has been derived for homogeneous electrically small antennas. The spherical wave expansion is utilized to express the radiated field and the current distribution on an antenna, and the radiation efficiency is represented by the current, which is expressed in the spherical wave expansion coefficients and the nonradiating current. By using a concept of the nonradiating current, it is shown that the maximum radiation efficiency is achieved if the antenna shape is spherical. The radiation efficiency of a spherical antenna is maximized by varying the expansion coefficients. This radiation efficiency is compared with that of the antenna which achieves the maximum gain and those of linear antennas. The comparison indicates the validity of our proposed upper limit of the radiation efficiency.},
keywords={},
doi={10.1587/transele.E98.C.2},
ISSN={1745-1353},
month={January},}
Copy
TY - JOUR
TI - Theoretical Limitation of the Radiation Efficiency for Homogenous Electrically Small Antennas
T2 - IEICE TRANSACTIONS on Electronics
SP - 2
EP - 7
AU - Keisuke FUJITA
AU - Hiroshi SHIRAI
PY - 2015
DO - 10.1587/transele.E98.C.2
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E98-C
IS - 1
JA - IEICE TRANSACTIONS on Electronics
Y1 - January 2015
AB - Maximum radiation efficiency has been derived for homogeneous electrically small antennas. The spherical wave expansion is utilized to express the radiated field and the current distribution on an antenna, and the radiation efficiency is represented by the current, which is expressed in the spherical wave expansion coefficients and the nonradiating current. By using a concept of the nonradiating current, it is shown that the maximum radiation efficiency is achieved if the antenna shape is spherical. The radiation efficiency of a spherical antenna is maximized by varying the expansion coefficients. This radiation efficiency is compared with that of the antenna which achieves the maximum gain and those of linear antennas. The comparison indicates the validity of our proposed upper limit of the radiation efficiency.
ER -
English
