Broadband RC-loaded microwave cylindrical antenna with approximately real input admittance

1977 ◽  
Vol 47 (5) ◽  
pp. 225 ◽  
Author(s):  
Dj. S. Paunović ◽  
B.D. Popović
Keyword(s):  
Input Admittance ◽  
Cylindrical Antenna

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.

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.

ON A CYLINDRICAL ANTENNA IN A HOMOGENEOUS ANISOTROPIC MEDIUM

1966 ◽  
Vol 44 (6) ◽  
pp. 1239-1266 ◽  
Author(s):  
K. Aoki
Keyword(s):  
Anisotropic Medium ◽  
Fourier Transforms ◽  
Resonance Phenomenon ◽  
Dielectric Tensor ◽  
Input Admittance ◽  
Circulating Current ◽  
Cylindrical Antenna ◽  
Antenna Length ◽  
Current Flows ◽  
Homogeneous Anisotropic Medium

The admittance problem of an antenna imbedded in a homogeneous anisotropic medium in which the dielectric tensor is given by the form in eq. (1) is formulated by the theory of Fourier transforms, and analyzed with the aid of the Wiener–Hopf technique. The current distribution and the input admittance of an infinite and finite antenna are evaluated approximately under the following assumptions: (1) the medium is loss free, (2) (radius of the antenna/wavelength) [Formula: see text], (3) the nondiagonal elements of the dielectric tensor are very small compared with its diagonal elements and ωp < ω < ωe (ωp, ω, and ωe are the plasma, signal, and cyclotron frequencies), (4) (antenna length/wavelength) is not small. Our present results have forms similar to the well-known solutions in an isotropic medium, except for two distinctions. The first is that a circulating current flows on the antenna, although its magnitude is very small. The second is an additional resonance phenomenon due to the interaction of two traveling current waves with slightly different propagation constants.

A HALF HOLLOW CYLINDRICAL ANTENNA (HHCA) ANALYSIS USING THE CFDTD ALGORITHM

2009 ◽  
Vol 11 ◽  
pp. 51-60
Author(s):  
Denden Mohsen ◽  
Nabil Ghannay ◽  
Abdelaziz Samet
Keyword(s):  
Cylindrical Antenna

Optimal broadband cylindrical antenna with one and two lumped capacitive loadings

1975 ◽  
Vol 11 (5) ◽  
pp. 99 ◽  
Author(s):  
B.D. Popović ◽  
M.B. Dragović ◽  
A.R. Djordjević
Keyword(s):  
Cylindrical Antenna
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