چكيده به لاتين
In this research, we will analyze and investigate a structure that by using suitable arrays for polarization conversion and the necessary absorber of electromagnetic waves in the microwave band for common radars (which is the subject of the report simulation) along with structures as a substrate, we can take a step towards the idea To reduce the cross section of the radar, let's take the new ones so that this structure can be installed for different purposes. First, we follow the design method in a simple way that we design a single cell that has been checked using circuit analysis and polarization conversion in a wide band. From 16 to 26 GHz, linear conversion is done well, if we have a linear to circular conversion in a band of 14.2 to 15.8 GHz. The second unit cell is designed, which is also done with a slight change in the first unit cell, and linear conversion in the 16.7 to 27 band. 3. And circular conversion is done in bands 14-17, 24.8-26.3 and 28.
Then, due to the non-overlapping of the frequency bands, considering the symmetry of the combination of two single cells, we perform and simulate and check the possibility of expanding the bandwidth, etc., and in the bands 16.5-21.5 and 22.2-25 26.2-27, 27.9-28.1, linear conversion is done and circular conversion is done in bands 13.7-16.7 and 23.8-25.3, 26.3-27.3; The point here is that the cross-bridge reflection range was almost similar to the mirror image, but the two phases were opposite, so the supersurface mirror arrangement of the polarization conversion in a specific frequency band can be realized using the phase cancellation method of the scattered field, and now by using the benefits of the design We offer the conversion of linear to linear and linear to circular polarization of the radar cross-sectional area reduction array. The said mirror array is mirrored only once in the center and in the general form of each of the 2x2 arrays in rows and columns. They are repeated in a similar way. The working method is that first the polarization conversions are done and then the phase neutralization is done to achieve the reduction of the desired radar cross-section.
Note: For radiation with circular polarization to the structure, as we will see below, the polarization conversion is done in the same way as for the symmetrical structure, and in the mirror structure, like the radiation with linear polarization, we see a reduction in the monostatic and bistatic radar cross-section.
