In this study, a method was experimentally verified for further reducing the radar cross-section (RCS) of a two-dimensional planar target by using a dielectric rim in a dielectric barrier discharge (DBD) plasma generator using a frequency selective surface (FSS) as an electrode. By designing the frequency selective surface such that the passbands of the radar signal match, it is possible to minimize the effect of the conductor electrode, in order to maximize the RCS reduction effect due to the plasma. By designing the FSS to be independent of the polarization, the effect of RCS reduction can be insensitive to the polarization of the incoming wave. Furthermore, by introducing a dielectric rim between the FSS electrode and the target, an additional RCS reduction effect is achieved. By fabricating the proposed plasma generator, an RCS reduction effect of up to 6.4 dB in X-band was experimentally verified.
This paper presents a dielectric-barrier-discharge (DBD) plasma generator using a coplanar method for reducing the radar cross section (RCS). Two electrodes of the plasma generator are placed in the form of a finger structure, and a 0.254 mm thick polyimide film is coated over the electrodes to act as the dielectric barrier. When a potential bias is applied, plasma is generated between the electrodes. By placing the plasma generator in front of a target, the RCS of the target is reduced by plasma generation. Fingers of widths 3 mm each were cross-arranged on 2.4 mm thick FR-4 substrates at 3 mm intervals to produce generators with a total size of 200×200 mm 2 . to experimentally verify the effects of RCS reduction at 0.3 atmospheric pressure for copper substrate targets of the same size. Thus, the monostatic RCS of a target of size 200×200 mm 2 was reduced by up to 2.6 dB in the X-band (8~12 GHz).
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