Abstract
The antenna end of the tethered balloon-type high-power VLF communication system will be exposed to an extremely strong alternating electric field environment when it is in operation. Due to dielectric loss, an abnormal temperature rise may occur at the antenna end, which may lead to an antenna fracture in serious cases. It is an effective measure to install a corona ring at the end of the antenna to prevent such accidents. In this paper, the structural parameters of the corona ring, including ring radius, tube radius, and ring depth, are optimized based on intelligent optimization algorithm to significantly improve the electric field distribution and restrain the temperature rise to the maximum extent. The effectiveness of the optimization results is verified by simulation.
Highlights
Theoretical Analysis and Simulation ModelWhen the high-power VLF communication system transmits signals, the voltage at the end of the antenna is very high, and correspondingly, the electric field intensity at the end of the antenna is very high which could be up to 107 V/m
International Journal of Antennas and Propagation element method (FEM) simulation, Chen et al [5] have analyzed the two types of the VLF antenna on aircraft including the single and the dual trailing wire antenna, which are used to transmit messages to submarines. e simulation result shows that the dual trailing antenna has smaller input impedance and higher input efficiency of the transmitter compared to the single one. erefore, the airborne VLF dual trailing antenna system is better
To figure out the influence of the ring implementation, the simulation results of models with a medium-sized ring and without corona ring were compared. e structural parameters of the medium-sized ring are as follows: the tube radius is 20 mm, the ring radius is 225 mm, and the ring depth is 200 mm. e electric field distributions of the models are shown in Figures 4 and 5
Summary
When the high-power VLF communication system transmits signals, the voltage at the end of the antenna is very high, and correspondingly, the electric field intensity at the end of the antenna is very high which could be up to 107 V/m. According to (1), the quasistatic field could be expressed by Poisson’s equations of electric potential as follows:. According to (3), the dielectric loss power is proportional to the squared electric field intensity. Erefore, it is effective to limit the dielectric loss and temperature rise by reducing the electric field strength at the terminal of the VLF antenna. Erefore, the electric field intensity at the position shown in the red rectangle box in Figure 2 is the focus of this paper.
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