A flange surface impedance influence on radiation efficiency of finite plane waveguide array

2010 ◽  
Author(s):  
V. V. Scherbinin
Keyword(s):  
Surface Impedance ◽  
Radiation Efficiency ◽  
Plane Waveguide ◽  
Waveguide Array ◽  
Finite Plane

scholarly journals Surface impedance of electromagnetic field excited by a grounded horizontal antenna in the Earth–ionosphere waveguide

2019 ◽  
pp. 181-189
Author(s):  
E. D. Tereshchenko ◽  
P. E. Tereshchenko
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Surface Impedance ◽  
Low Frequency ◽  
Wave Impedance ◽  
Skin Layer ◽  
Skin Depth ◽  
Plane Waveguide ◽  
The Earth ◽  
Horizontal Antenna

Analytical formulas for the tangential components of extremely-low-frequency (ELF) electromagnetic field in the Earth–ionosphere plane waveguide excited by a grounded linear horizontal antenna are obtained. The behavior of surface impedance is studied as a function of electrodynamic characteristics of the waveguide and the distance from the source. It is shown that surface impedance coincides with the plane wave impedance on the Earth’s surface at distances from the source larger than the skin depth provided that the skin layer is thinner than double the waveguide’s height. The influence of the ionosphere on the amplitude of the ELF and lower-frequency magnetic field and, thus, on the impedance at the distances shorter than two ionospheric heights is theoretically substantiated. This type of effect was observed in the experiments conducted on the Kola Peninsula where the low conductivity of the Earth allowed the detection of the effect of the ionosphere on the amplitude of the magnetic field in the low-frequency band.

scholarly journals A Low VSWR and High Efficiency Waveguide Feed Antenna Array

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Zhao Xiao-Fang ◽  
Liu Hua-Zhu ◽  
Li Yi ◽  
Zhou Shi-Gang ◽  
Chow-Yen-Desmond Sim
Keyword(s):  
Antenna Array ◽  
High Efficiency ◽  
Satellite Communications ◽  
Radiation Efficiency ◽  
Plane Waveguide ◽  
Antenna Gain ◽  
High Radiation ◽  
Milling Method ◽  
Array Fabrication ◽  
Ku Band

A low VSWR and high efficiency antenna array operating in the Ku band for satellite communications is presented in this paper. To achieve high radiation efficiency and broad enough bandwidth, all-metal radiation elements and full-corporate waveguide feeding network are employed. As the general milling method is used in the multilayer antenna array fabrication, the E-plane waveguide feeding network is adopted here to suppress the wave leakage caused by the imperfect connectivity between adjacent layers. A 4 × 8 elements array prototype was fabricated and tested for verification. The measured results of proposed antenna array show bandwidth of 6.9% (13.9–14.8 GHz) for VSWR < 1.5. Furthermore, antenna gain and efficiency of higher than 22.2 dBi and 80% are also exhibited, respectively.

PONDEROMOTIVE EFFECT OF ELECTROMAGNETIC WAVES ON THIN VIBRATORS WITH WEAKLY PERTURBED SURFACE IMPEDANCE

2020 ◽  
Vol 79 (14) ◽  
pp. 1205-1215
Author(s):  
Yu. M. Penkin ◽  
V. A. Katrich ◽  
M. V. Nesterenko ◽  
S. L. Berdnik
Keyword(s):  
Surface Impedance ◽  
Electromagnetic Waves
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