The Coupling Characteristics Of Antenna Feed System Exposed In Strong Electromagnetic Impulse

As the interface that electromagnetic waves move in and out of the communicationdevice, antenna feed system is the main equipment that electronic information system, such asradar and navigator, receives and launches space electromagnetic waves. With the sustainablegrowth of system types, the cumulative increase in the number of systems used and thecontinuous improvement of the system complexity, electromagnetic compatibility andinterference becomes a more and more tough problem. Especially under the interferenceeffect of strong electromagnetic pulse from nuclear explosion, lighting stroke andelectromagnetic pulse weapons, it is more difficult to ensure the security and stability ofelectronic information system.This paper will model, simulate and analyze the above issues using the method ofcomputational electromagnetics. In order to eventually realize the real-time observation of thesystem electromagnetic characteristics, we mainly adopt the time-domain algorithm. Tocompare the calculation features of integral equation and differential equation, the finitedifference time domain (FDTD) algorithm is chosen as the method of modeling andsimulation analysis of antenna and arrester, and marching on in time (MOT) algorithm as themethod of analyzing the loaded cavities. The article will first of all, introduce finite differencetime domain algorithm in detail, and put forward a kind of absorbing boundary conditionsbased on Huygens equivalent principle, then introduce MOT algorithm, and finally realize themodeling and simulation analysis of antenna feed system using those algorithms. Themodeling of antenna feed arrester is an important issue. The key device in an arrestor is the gas discharge tube (GDT). The basic simulation problems involved in GDT has also beendiscussed in this paper.