The Design Of Electromagnetic Energy Selective Surfaces And Its Applications In High Power Emp Protection

Electromagnetic Energy Selective Surfaces(ESS) is a new conception named in reference of Frequency Selective Surfaces(FSS). Its ideal working status is energy adaptive switching character, that electromagnetic wave would pass freely if its energy were less than the security threshold, whereas it would be screened if its energy were higher than the security threshold.This kind of structure can effectively protect electromagnetic pulse without affect the equipment. Its principle is that its impedance changes to low impedance condition from high impedance condition at the function of strong electric field, so function as a screen. for the lower electric field wave, because of its intension is relatively feebleness, the ESS can't change to low impedance condition from high impedance condition, so the wave passed freely.This paper explored the realization way of ESS by use of PIN diode through a series of simulation and experiment. Researched how different structure, different size and different PIN diode influence its character. Analyzed how the pinnacle leakage occurred when used as EMP protector and how to restrain it.The applications of ESS in wave guide limiter and antenna cover is studied further more.The paper can be devided into four parts:The first part expatiate the research background and important meaning of ESS,introduced relative research fruit and actuality,show out the main work and innovation point in short.The second part introduced the design thought of ESS,designed the structure for linear polarized wave and circular polarized wave separately, researched how different structure, different size and different PIN diode influence its character,then optimized the design.In the third part,the applications of ESS in EMP protection and its reliability is researched,analyzed how the pinnacle leakage occurred and how to restrain it,how the double deck which space between one fourth wave length influence the insertion loss and isolation loss, studied the influence to wave form and radiation pattern when used as wave guide limiter and antenna cover,at the end of the part,the angle character of ESS is studied at the condition of inclined incidence of the wave.In the fourth part, we designed and realized the ESS on the base of FR-4 board, given out the test result of S parameter and limit character,the influence of ESS on radiation pattern when used as antenna cover is also given out by experiment.