Abstarct: In this thesis, an EBG structure is used to reduce radar cross-section. In general, these structures have unique features that realize this goal. The high bandwidth and low sensitivity are the main challenges in design of an EBG structure. The EBG provided in this thesis is manufactured on a typical FR-4 substrate with thickness of 3.2 mm. In fact, this structure consists of two different cells, the first cell is five square mextal, and the second one is a mextal-free plane. The structure is arranged in 4×4 chessboard plane. baxsed on simulations, the phase difference (180°± 37°) is occurred in frequency range of 6.2 GHz to 12.6 GHz this means that the structure has 64% of the frequency bandwidth. The two type of polarization TEz and TMz is also investigated. The results show a good bandwidth. The structure presented in this thesis was constructed and the radar cross section of structure was measured at two frequencies of 7.5 GHz and 11.2 GHz, which resulted in a decrease of radar cross-section of 11.59 dB and dB 8.41, respectively. The equivalent circuit of the structure was simulated with ADS, which had a very good fit with the CST simulation.