Current distribution and input impedance of an infinite cylindrical antenna in anisotropic plasma

1966 ◽  
Vol 2 (2) ◽  
pp. 72 ◽  
Author(s):  
Y.T. Lo ◽  
S.W. Lee
Keyword(s):  
Current Distribution ◽  
Input Impedance ◽  
Anisotropic Plasma ◽  
Cylindrical Antenna

scholarly journals Теория ленточной антенны, расположенной на плоской границе раздела одноосного магнитного метаматериала и изотропной среды

2019 ◽  
Vol 89 (10) ◽  
pp. 1598
Author(s):  
Т.М. Заборонкова ◽  
А.С. Зайцева ◽  
А.В. Кудрин ◽  
Н.В. Юрасова
Keyword(s):  
Singular Integral ◽  
Current Distribution ◽  
Input Impedance ◽  
Singular Integral Equations ◽  
Anisotropy Axis ◽  
Strip Conductor ◽  
Transmission Line Theory ◽  
Narrow Strip ◽  
Time Harmonic ◽  
Line Theory

A study is made of the electrodynamic characteristics of an antenna having the form of an infinitesimally thin, perfectly conducting narrow strip located at the plane interface of a uniaxial magnetic metamaterial and an isotropic magnetodielectric medium. The antenna is perpendicular to the anisotropy axis of the metamaterial and is excited by a time-harmonic given voltage. Singular integral equations for the antenna current are obtained in the case of an infinitely long strip conductor. Based on the solution of these equations, the current distribution and input impedance of the antenna are found and analyzed. The limits of applicability of an approximate method based on the transmission line theory for determining the antenna characteristics are established. Within the framework of this method, the results obtained are generalized to the case of a finite-length strip antenna.

The Method for Broadband Folded Dipoles Using Branch Current Redistribution

2014 ◽  
Vol 548-549 ◽  
pp. 1381-1384
Author(s):  
Xu Xie ◽  
Chao Liu ◽  
Liang Zhou ◽  
Hua Ning Wu
Keyword(s):  
Current Distribution ◽  
Input Impedance ◽  
Present Method ◽  
High Input ◽  
High Input Impedance ◽  
Branch Model ◽  
Practical Model ◽  
Antenna Mode

The curtain array was usually composed of folded dipoles as elements for their high input impedance, but its bandwidth had a limitation for its antenna mode. This paper proposed a method for broadband folded dipoles using branch arms for current redistribution, which increased the bandwidth of input impedance and VSWR effectively by choosing the proper positions of the branch wires. The current distribution on branch model showed an unbalanced condition as the branch wires moved. As verification, a practical model with cage antenna had been analyzed by the present method and FEKO. The results illustrated that when factor k was between 0.4 and 0.5, the bandwidth would be maximum.

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