RADIATION FROM A CURRENT FILAMENT CLAD BY AN ANISOTROPIC PLASMA SHEATH

1963 ◽  
Vol 41 (6) ◽  
pp. 858-862
Author(s):  
Yujiro Ohba
Keyword(s):  
Radiation Field ◽  
Linear Polarization ◽  
Plasma Sheath ◽  
Anisotropic Plasma ◽  
Far Field ◽  
Direction Parallel ◽  
Current Filament ◽  
Te And Tm Modes ◽  
Elliptically Polarized ◽  
A Current

The radiation field from a plasma-clad filament carrying a current I0 exp (−jkzz + jωt) is calculated. The plasma, which is finite in thickness, is magnetized in the direction parallel to the current filament. The field outside the plasma sheath is expressed by a combination of TE and TM modes, and in general the field is elliptically polarized. The conditions for circular and linear polarization in the far field are related to the thickness of the plasma sheath and the wave constants of the plasma.

Electrodeless breakdown in elliptically polarized fields at 60 Hz

1983 ◽  
Vol 61 (9) ◽  
pp. 1284-1290
Author(s):  
D. E. Friedmann ◽  
F. L. Curzon ◽  
M. Feeley
Keyword(s):  
Field Strength ◽  
Linear Polarization ◽  
Breakdown Strength ◽  
Breakdown Threshold ◽  
Glass Bulb ◽  
Maximum Field Strength ◽  
High Fields ◽  
Strength Formula ◽  
Elliptically Polarized ◽  
Maximum Field

Theoretical and experimental results are presented on the frequency of electrodeless breakdown (fB) of a gas in a spherical glass bulb immersed in an elliptically polarized field of maximum field strength [Formula: see text] and frequency fA (~60 Hz). It is found that the breakdown threshold is independent of the ellipticity and that graphs fB versus [Formula: see text] are stepped at low fields and linear at high ones. At high fields, fB = fAl/e0 where l is the circumference of the phasor and e0 is the breakdown strength of the gas ([Formula: see text] and [Formula: see text] respectively for circular and linear polarization). The implications of the results for measuring environmental fields are given.

Coulomb wave functions in the theory of the circular paraboloidal waveguide

1988 ◽  
Vol 66 (3) ◽  
pp. 212-227 ◽  
Author(s):  
J. LoVetri ◽  
M. Hamid
Keyword(s):  
Electromagnetic Fields ◽  
Focal Plane ◽  
Focal Length ◽  
Coulomb Field ◽  
Wave Functions ◽  
Field Pattern ◽  
Current Loop ◽  
Far Field ◽  
Far Field Pattern ◽  
A Current

In this paper it is shown how the Coulomb wave functions, commonly used in the description of a Coulomb field surrounding a nucleus, can be used in the description of electromagnetic fields that are symmetric with respect of [Formula: see text] inside a paraboloidal waveguide. The Abraham potentials Q and U, which are useful in describing fields with rational symmetry, are used to simplify the problem. It is shown that these potentials must satisfy a partial differential equation that when separated yields the Coulomb wave equation of order L = 0. Electromagnetic fields due to simple source distributions inside the paraboloid are expanded in terms of these functions. Specifically, solutions for current-loop sources located in the focal plane of the paraboloid are obtained. The case where the wall of the paraboloidal waveguide is assumed to be perfectly conducting is treated as well as the case where the wall has finite impedance. The finite paraboloid is also considered, and the far field is formulated using Huygen's principle. It is found that for the finite surface-impedance case, the far-field pattern due to a current loop operating at 100 MHz in the focal plane of a paraboloidal reflector of 1 m focal length is different from the perfectly conducting case. Specifically, the pattern seems to be more omnidirectional for the impedance case than for the perfectly conducting case. Numerical results are presented for relevant aspects of the problem.

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