Radiation resistance of an electric dipole in a magnetoplasma

1968 ◽  
Vol 46 (4) ◽  
pp. 283-285
Author(s):  
S. R. Seshadri
Keyword(s):  
Electric Dipole ◽  
Radiation Resistance

On VLF Radiation Resistance of an Electric Dipole in a Cold Magnetoplasma

Radio Science ◽  
1970 ◽  
Vol 5 (3) ◽  
pp. 605-610 ◽  
Author(s):  
T. N. C. Wang ◽  
T. F. Bell
Keyword(s):  
Electric Dipole ◽  
Radiation Resistance

RADIATION FROM AN ELECTRIC DIPOLE IN AN AXIALLY MAGNETIZED PLASMA COLUMN—DIPOLAR MODES

1967 ◽  
Vol 45 (11) ◽  
pp. 3627-3648 ◽  
Author(s):  
G. L. Yip ◽  
S. R. Seshadri
Keyword(s):  
Electric Dipole ◽  
Radiation Resistance ◽  
Guided Waves ◽  
Plasma Frequency ◽  
Axial Magnetic Field ◽  
Radiation Power ◽  
Magnetized Plasma ◽  
Signal Frequency ◽  
Radiation Characteristics ◽  
Power Pattern

The radiation characteristics of an electric dipole are investigated for the case in which it is situated on, and oriented perpendicular to, the axis of an infinitely long and axially magnetized column of uniform, lossless, and cold plasma. In general, the electric dipole will excite space waves as well as guided waves, both of which are dipolar in nature. The radiation power pattern and the radiation resistance, resulting from the space waves, are investigated as a function of the column radius, the signal frequency, and the strength of magnetization. For thin and isotropic plasma columns, the radiation resistance has a maximum, which is due to the dipolar resonance. This resonance occurs at 1/√2 times the plasma frequency. The introduction of anisotropy by the application of an axial magnetic field results in the splitting of the single dipolar resonance into two, occurring at frequencies below and above 1/√2 times the plasma frequency. Finally, a comparison is made between the radiation characteristics in the present problem and those due to an axially oriented dipole.

RADIATION FROM AN ELECTRIC DIPOLE IN A MAGNETOPLASMA

1966 ◽  
Vol 44 (12) ◽  
pp. 3053-3067 ◽  
Author(s):  
S. R. Seshadri
Keyword(s):  
Electric Dipole ◽  
Radiation Resistance ◽  
Numerical Evaluation ◽  
Total Radiation ◽  
Magnetostatic Field ◽  
Azimuthal Mode ◽  
Cylindrical Waves ◽  
Axis Of Symmetry ◽  
The Individual ◽  
Parameters Of Interest

The fields radiated by an arbitrarily oriented electric dipole in an unbounded, loss-free magnetoplasma are synthesized in terms of cylindrical waves, with the direction of the magnetostatic field as their axis of symmetry. Six independent modes specified by two radial and three azimuthal mode numbers are found to be excited. The total radiation resistance of the electric dipole is shown to be obtainable as the superposition of the contributions arising from the individual modes. Integral expressions for the radiation resistance due to the various modes are obtained and are used in the numerical evaluation of the radiation resistance for some typical values of the parameters of interest. The radiation resistance of an arbitrarily oriented electric dipole is found to become infinite in two frequency ranges on account of the gyro- and plasma resonances, as well as at the upper hybrid resonant frequency, and a discussion of the procedure for eliminating the infinite behavior of the radiation resistance is included.

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