Current distribution under high frequency and transient conditions in earth electrode systems

2012 ◽  
Author(s):  
S. Mousa ◽  
H. Griffiths ◽  
N. Harid ◽  
A. Haddad
Keyword(s):  
Current Distribution ◽  
High Frequency ◽  
Transient Conditions ◽  
Electrode Systems ◽  
Earth Electrode

scholarly journals A Capacitively-Fed Inverted-F Antenna for Displacement Detection in Structural Health Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5310
Author(s):  
Songtao Xue ◽  
Zhiquan Zheng ◽  
Shuai Guan ◽  
Liyu Xie ◽  
Guochun Wan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Resonant Frequency ◽  
Current Distribution ◽  
Health Monitoring ◽  
High Frequency ◽  
Relative Displacement ◽  
Displacement Sensor ◽  
First Order ◽  
High Frequency Structure Simulator ◽  
Dimensional Parameters

This paper presents a capacitive displacement sensor based on a capacitively fed inverted-F antenna (CFIFA) for displacement detection. The sensor is composed of a grounded L-shape patch and a rectangular upper patch, forming a capacitor between them. The asymmetric dipole model is adopted to explain the frequency shift and current distribution of the proposed antenna sensor at its first-order resonance. The numerical simulation of the CFIFA using the Ansoft high-frequency structure simulator (HFSS) software is carried out to optimize the dimensional parameters, allowing the antenna to perform better. Two sets of CFIFAs are fabricated and tested for verification. Results show that the CFIFA has a good linear relationship between its first resonant frequency and the relative displacement, and is capable of a long range of displacement measuring.

Electromagnetic Characteristics of Yagi-Uda Antenna at HF/VHF/UHF

2018 ◽  
Vol 3 (2) ◽  
pp. 7-11
Author(s):  
Raji A. Abimbola
Keyword(s):  
Electric Field ◽  
Method Of Moments ◽  
Current Distribution ◽  
High Frequency ◽  
Very High Frequency ◽  
Radiation Characteristics ◽  
Radiation Beam ◽  
Field Patterns ◽  
Electromagnetic Characteristics ◽  
Very High

In this paper, the radiation characteristics of Yagi-Uda antenna operating at High Frequency (HF), Very High Frequency (VHF) and Ultra High Frequency (UHF) are examined. Upon employing method of moments, the current distribution on the antenna emerges from the solution of matrix equation. It is found that the angular distribution of electric field intensity generated in free space by the antenna, obtained by evaluating the integral of associated current distribution, is characterized by patterns with significant portion of radiation beam in the main lobe in the direction of Yagi axis. This is accompanied by relatively small undesirable radiation in the minor lobe, and which persist over those communication frequencies. It is observed also that the current distribution that generates the radiated electric field patterns is relatively consistent over the same range of frequency.

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