Frequency Selected Transmission And Obsorption Effects Of Plasma Artificial Structures In Crossed Alignment

Periodic electromagnetic structure is a periodic array structure composed of similar electromagnetic scatterers,such as phased array antenna,frequency selective surface and photonic crystal,etc.It has many excellent characteristics,one of which is the frequency selective characteristic of periodic electromagnetic structure Utilize the periodic distribution of the electromagnetic structure and control its electromagnetic parameters to cause changes in electromagnetic characteristics,so that the periodic electromagnetic structure can selectively transmit or absorb electromagnetic waves in a specific frequency band.In nature,the physical properties of plasma such as temperature and density can be artificially controlled by external parameters.Its frequency also covers the entire microwave band.Plasma is added to the periodic electromagnetic structure,and the plasma is arranged periodically as a medium.,So that the plasma periodic structure not only has many characteristics of the periodic electromagnetic structure,but also has the characteristics of plasma control.Therefore,the important application prospect of the plasma periodic electromagnetic structure in the field of electromagnetic wave frequency selection technology makes it a popular cross-cutting topic across the plasma field and the electromagnetic wave field.In order to make the periodic electromagnetic structure have stronger dynamic adjustability and wider effective selective transmission frequency band,researchers at home and abroad have carried out a wide range of theoretical research,time-varying plasma and plasma periodic structure layout.Research,but most of the current research work is directed to simple periodic structures,such as parallel array structures,by changing the plasma state parameters or manufacturing defects in the array to change the electromagnetic characteristics of the structure,and for non-parallel array plasma There are few reports on periodic structures.In this regard,this paper proposes a staggered plasma periodic structure,and carried out the following research work:1.Design and prepare a periodic structure of two-layer interlaced plasma,and conduct experimental tests and simulation calculations on samples with different interlayer distances and different interlaced angles.The structure with a staggered angle of 45° and an interlayer distance of 7 mm achieves a frequency band of 13.74-18 GHz where the difference in transmittance of the plasma switch state is less than 3 d B;within the passband,the average attenuation of the reflectance of the staggered plasma periodic structure is 6.27 d B,The 5d B attenuation band is 15.77-18 GHz;outside the passband,the mean value of the intermittent plasma periodic structure attenuation attenuation is-7.43 dB,and the 5 dB attenuation band is 6-11.18 GHz and 12.98-14.57 GHz.As the interlayer distance and stagger angle change,the reflectance suppression and transmittance difference also change.2.To explore the effect of plasma frequency,intra-layer distance,and number of stacked layers on the reflection and transmission characteristics of the interlaced plasma periodic structure under ideal conditions.The frequency bands with a difference in over-rate difference of less than 3d B are14.3-15.8 GHz and 16.5-17 GHz;in the passband,the interleaved plasma periodic structure reflectance attenuation 5d B band is 14.7-17.5 GHz;outside the passband,the interleaved plasma periodic structure Reflectivity attenuation 5d B frequency band is 8.9-9.2 GHz and 11.8-13.8 GHz.On this basis,as the distance between layers and the number of stacked layers change,the reflectance suppression and the difference in transmittance also change.