Study On The Near-field Hazard Of Short-wave Antenna

Electromagnetic environment is very complex because of many electronic devices and various radiation on the ship, Because the power is large,near-field field strength is high with the wide range of radiation,radiation hazards of shortwave antenna is so large.Therefore researching shortwave antennas’ near-field hazard is necessary.In this paper,we mainly research shortwave antenna (2-30M) near-field radiation hazard with a typical ship as a platform.Firstly, we analysis the field strength of the overall impact on the consolidated and the superstructure of the ship’s electromagnetic environment.Make out the most vulnerable areas of the hull radiation hazards.Then select shortwave antennas at different locations on the ship as a transmitting antenna. Come out antennas’ near field strength valuesAnd hazards from weaponry region with the Ship EDF from Italy.Analysis of the reasons, summed up the antennas’ radiation hazards on special position variation of the number and distribution of antenna.Thereby we conclude a reference to the rational distribution of ship shortwave antenna.This paper calculate the size of shortwave antenna near-field field strength values and hazards based on MOM.The main contents include that:1 .General calculation method of the antenna their advantages, disadvantages and scope are studied in this paper and finally choose MOM as our method.And then describe the method of MOM and its calculation procedure derivation and analysis In this paper, we use multilevel fast multipole algorithm combined with MOM to calculate to reduce the computational complexity and improve efficiency.2.Antenna near-field calculations (including standing wave antenna and traveling wave antenna) and simulate based on MOM to prove the necessity of Near-field analysis and correctness of the algorithm of shortwave antenna are discussed.3.Models and electromagnetic models are builded with auto-CAD. Compute antenna near-field parameters relationship with the superstructure independently in free space.Simulate and analysis the overall electromagnetic environment according to the appropriate standard.Finally, we get the impact on radiation hazards and variation of antennas on ship from the superstructure of the ship.4.It focus on the impact of the near-field radiation hazards from shortwave antenna layout on typical antenna.Then provide a reference for the rational distribution of the antenna on the ship.Experiment results show that near-field radiation hazards from shortwave antenna on the ship is great and it easily cause harm to sensitive positions ship.this paper analysis the impact on antenna radiation which come from the arrangement of the superstructure on the ship. And select shortwave antennas on different locations as transmitting antenna.We come out the influence of the antennas location and layout to their radiation hazards.The result consistent with the theoretical analysis and we get perfect simulation results.So we can provide a reference antenna layout in the actual construction in the future.