The Field in a Narrow Circumferential Slot in a Coaxial Waveguide

1973 ◽  
Vol 51 (9) ◽  
pp. 946-955 ◽  
Author(s):  
R. A. Hurd
Keyword(s):  
Electric Field ◽  
Outer Wall ◽  
Coaxial Waveguide ◽  
Input Admittance ◽  
Quantity Of Interest ◽  
Cylindrical Antenna

The first three terms in the expansion of the electric field in a narrow circumferential gap in the outer wall of a coaxial waveguide have been determined. Also found is the input admittance of an infinite, coaxially fed cylindrical antenna, a quantity of interest in the theory of sleeve antennas.

scholarly journals An Efficient Deterministic-Stochastic Model of the Human Body Exposed to ELF Electric Field

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Anna Šušnjara ◽  
Dragan Poljak
Keyword(s):  
Electric Field ◽  
Stochastic Model ◽  
Human Body ◽  
Low Frequency ◽  
Stochastic Approach ◽  
Axial Current ◽  
The Body ◽  
Cylindrical Antenna ◽  
New Perspective ◽  
Mean Trend

The paper deals with the deterministic-stochastic model of the human body represented as cylindrical antenna illuminated by a low frequency electric field. Both analytical and numerical (Galerkin-Bubnov scheme of Boundary Element Method) deterministic solutions of the problem are outlined. This contribution introduces the new perspective of the problem: the variability inherent to input parameters, such as the height of the body, the shape of the body, and the conductivity of body tissue, is propagated to the output of interest (induced axial current). The stochastic approach is based on the stochastic collocation (SC) method. Computational examples show the mean trend of both analytically and numerically computed axial current with the confidence margins for different set of input random variables. The results point out the possibility of improving the efficiency in calculation of basic restriction parameter values in electromagnetic dosimetry.

TEM Wave Scattering by a Step Discontinuity on the Outer Wall of a Coaxial Waveguide

2013 ◽  
Vol 61 (8) ◽  
pp. 2783-2791 ◽  
Author(s):  
Sinan Aksimsek ◽  
Gokhan Cinar ◽  
Borje Nilsson ◽  
Sven Nordebo
Keyword(s):  
Wave Scattering ◽  
Outer Wall ◽  
Coaxial Waveguide ◽  
Step Discontinuity

The Electric Field Very Near a Driven Cylindrical Antenna

Radio Science ◽  
1966 ◽  
Vol 1 (3) ◽  
pp. 353-360 ◽  
Author(s):  
Ronold W. P. King ◽  
Tai Tsun Wu
Keyword(s):  
Electric Field ◽  
Cylindrical Antenna

Effects of Oblique Misalignments on a Coaxial Waveguide Performance

2013 ◽  
Vol 392 ◽  
pp. 456-460
Author(s):  
Yong Chao Xie
Keyword(s):  
Outer Wall ◽  
Field Amplitude ◽  
Coaxial Waveguide ◽  
Field Profile ◽  
Misalignment Angle ◽  
Engineering Applications ◽  
Technological Factors ◽  
S Parameter ◽  
Tem Mode ◽  
Cst Microwave Studio

The effects of the misalignment between the inner-rod axis and the outer-wall axis in an open coaxial waveguide are studied by means of the software CST microwave studio. Results show that the field amplitude and S parameter of TEM mode decreased with the oblique misalignment angle increased. But the effect is little. While the oblique misalignment angle is up to, the field profile of TEM mode is affected largely. So in the practical of engineering applications, we should try to avoid the occurrence of oblique eccentric between the inner rod and outer wall during to technological factors.

Input admittance of a thin dielectric-sleeved finite antenna excited by a uniform field

1983 ◽  
Vol 61 (5) ◽  
pp. 691-702
Author(s):  
T. C. K. Rao ◽  
M. A. K. Hamid
Keyword(s):  
Variational Method ◽  
Numerical Results ◽  
Uniform Field ◽  
Input Admittance ◽  
Cylindrical Antenna ◽  
Trial Field ◽  
Final Expression ◽  
Dielectric Sleeve

The input admittance of a long hollow conducting cylindrical antenna with an infinitely long dielectric sleeve surrounding it, and excited by a uniform field applied across a gap of a given width at the center, is determined by a variational method. A suitable trial field is chosen and the resulting integrals are evaluated asymptotically with the assumptions that the electrical radius of the antenna is small and its length is large. The final expression is easy to evaluate and some numerical results are presented.

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