A phenomenon that the radiated power may be enhanced when an antenna is surrounded by a finite plasma shell has been found in numerical and experimental studies. In this paper, a physical model was built to express the mechanism of the radiated enhancement. In this model, the plasma shell is treated as a parallel connection of a capacitance and a conductance whose parameters change with the system parameters (plasma density, collision frequency, and antenna frequency). So, the radiated enhancement can be explained by the resonance between the plasma shell and the infinite free space. Furthermore, the effects of system parameters on the radiated power are given and effects corresponding to mechanisms are performed based on the physical model.

Topics
Circuit theorems, Electromagnetism, Electric currents, Magnetic fields, Electrical conductor, Antennas, Computer simulation, Plasma properties and parameters, Plasma waves, Energy consumption
1.
M.
 
Kim
,
M.
 
Keidar
, and
I. D.
 
Boyd
, “
Analysis of an electromagnetic mitigation scheme for reentry telemetry through plasma
,”
J. Spacecr. Rockets
 
45
(
6
),
1223
–
1229
(
2008
).
https://doi.org/10.2514/1.37395
Google Scholar
Crossref
Search ADS
 
2.
C.
 
Lin
 and
K. M.
 
Chen
, “
Improved radiation from a spherical antenna by overdose plasma coating
,”
IEEE Trans. Antennas and Propag.
 
17
(
5
),
675
–
678
(
1969
).
https://doi.org/10.1109/TAP.1969.1139506
Google Scholar
Crossref
Search ADS
 
3.
D. D.
 
Morabito
, “
The spacecraft communications blackout problem encountered during passage or entry of planetary atmospheres
,”
IPN Progress Report No. 42-150
,
2002
.
Google Scholar
 
4.
R. W.
 
Ziolkowski
 and
A.
 
Erentok
, “
Metamaterial-based efficient electrically small antennas
,”
IEEE Trans. Antennas Propag.
 
54
(
7
),
2113
–
2130
(
2006
).
https://doi.org/10.1109/TAP.2006.877179
Google Scholar
Crossref
Search ADS
 
5.
A. M.
 
Messiaen
 and
P. E.
 
Vandenplas
,
Electron. Lett.
 
3
,
26
(
1967
).
https://doi.org/10.1049/el:19670021
Google Scholar
Crossref
Search ADS
 
6.
T. I.
 
Bichutskaya
 and
G. I.
 
Makarov
, “
Radiation from an electric dipole surrounded by a plasma cylinder with a cavity
,”
Radiophys. Quantum Electron.
 
45
(
7
),
509
–
519
(
2002
).
https://doi.org/10.1023/A:1020528725801
Google Scholar
Crossref
Search ADS
 
7.
C. C.
 
Lin
 and
K. M.
 
Chen
, “
Radiation from a spherical antenna covered by a layer of lossy hot plasma: Theory and experiment
,”
Proc. Inst. Electr. Eng.
 
118
(
1
),
36
–
42
(
1971
).
https://doi.org/10.1049/piee.1971.0005
Google Scholar
Crossref
Search ADS
 
8.
H. R.
 
Stuart
 and
A.
 
Pidwerbetsky
, “
Electrically small antenna elements using negative permittivity resonators
,”
IEEE Trans. Antennas Propag.
 
54
(
6
),
1644
–
1653
(
2006
).
https://doi.org/10.1109/TAP.2006.875498
Google Scholar
Crossref
Search ADS
 
9.
W.
 
Rotman
, “
Plasma simulation by artificial dielectrics and parallel-plate media
,”
IRE Trans. Antennas Propag.
 
10
(
1
),
82
–
95
(
1962
).
https://doi.org/10.1109/TAP.1962.1137809
Google Scholar
Crossref
Search ADS
 
10.
J. A.
 
Stratton
,
Electromagnetic Theory
(
John Wiley & Sons
,
2007
).
Google Scholar
 
© 2014 AIP Publishing LLC.
2014
AIP Publishing LLC
You do not currently have access to this content.