Experimental study on ferrite radar Absorbed material containing capacitive frequency selective surface

Ferrite radar Absorbing materials containing capacitive frequency selective surface(FSS) were prepared by heat compress molding techniques and the reflection loss of ferrite composites in the range of 8-18GHz were measured by a calibrated naval research laboratory(NRL) arch using a PNA8363B network analyzer of agilent corporation followed the GJB2038-94.It is found that the reflection loss of the ferrite composites containing capacitive FSS such as the slot width,the interval distance,the square resistance of FSS and the position of FSS in composites.For the slot width,the interval distance and the square resistance,best values exist for better microwave Absorbing properties of the composite,which are 5mm,7.2mm and 60Ω/□,respectively.The better reflection loss of composites can be reached when the FSS placed in the middle layer rather than the face layer and the reflection layer.The aim to improve the reflection loss of composites can be reached by controlling the frequency character of FSS in composites,which is a feasible path for design the good radar Absorbing materials.