Reradiate Computation Of Transmission Line To The Radio Wave

With the further development of the high-voltage technology and wireless communication technology, the air is becoming a very complex electromagnetic environment. High-voltage transmission systems for the direction characteristics of antennas are concerned, so that high-voltage transmission systems for the direction characteristics of antennas become many scholars'research topics. The main job of this article is simulateing about 110kV high-voltage transmission systems for the direction characteristics of medium-wave antennas, analysising simply about 110kV high-voltage transmission systems for the direction characteristics of short-wave antennas. Meanwhile, studying about 110kV high-voltage transmission systems for the direction characteristics of medium-wave antennas on the actual terrain, then giving a recommendation point of antenna based on research results and actual situation.This thesis is divided into five parts. First of all, the paper introduces the significance and status of high-voltage transmission systems for the antennas. The interference of high-voltage transmission systems to antennas has two cases, one is active interference, the other is passive interference (reradiate affect). The research on active interference are sophisticated and extensive, but the research on passive interference have not carried out extensively. This paper focuses on the study of passive interference of high-voltage transmission systems for the antenna.Secondly, the research methods and steps of passive interference are analyzed and discussed. The structure of high-voltage towers and antennas is complex, in order to simulate the reradiate affect must look for methods to simplify the structure; studying and analyzing the effect of each parameter, based on the results to determine the specific prarameters of towers; based on the research to build models, simulate models, the obtained simulation results in comparison to the results of literature, adjust models, then determine the final models. The study of this part is the foundation of the follow research. Thirdly, this paper focuses on the passive interference of 110kV high-voltage systems to the direction characteristic of medium-wave antennas. Single-loop high-voltage systems generally use cat-type towers, and double-loop high-voltage systems generally use drum-type towers, so we respectively consider the passive afeect of cat-type towers and drum-type towers high-voltage systems to the direction of medium antennas. The antennas work frequencies 531kHz,600kHz,860kHz,1MHz,711/1359kHz,1408 kHz,1606 kHz are into account. The Passive interference situation is mainly given the antennas patter with high-voltage systems and the affect patter by high-voltage systems, but drum-type high-voltage systems affect situation only give the ffect patter by high-voltage systems.Next, simply study the passive affect of 110kV cat-type towers high-voltage systems to short-wave antennas. We consider there types operating frequency of 2.4MHz short-wave antennas, HR4/2/0.5, HR4/4/0.5, HR8/4/1, antennas distance from high-voltage systems are 1λ,3λ,5λ, 500m, 1000m, 2000m respectively.Then, this paper studies the passive interference of 110kV high-voltage systemss to the direction characteristic of medium-wave antennas on actual terrain. This terrain is the new station of Mudanjiang Radio and Television Station. Simulate the model, base on the results and actual station, then give a recommendation point of antenna.Finally, the thesis summarizes the entire work and the future prospect of the relevant research work.