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Abstract
In this paper, a broadband microstrip antenna array matched with quarter wave microstrip line matching and Defected Ground Structure technical is proposed. The purpose of this paper is to use Defected Ground Structure (DGS) in microstrip antenna array to achieve an antenna array for ka-band application. The DGS position which is under the quarter wave line matching has an effect that has been presented in this paper. This work started with the single element antenna matched to a band [28–31.5] Ghz. After That, we have constructed and designed the antenna array in order to increase the gain and to obtain a radar antenna with high performances. The antenna array structure, fed by microstrip line and matched by quarter wave transformer, is printed on a Duroid 5880 substrate with dielectric constant of ϵrϵr = 2.22 and, tangent value 0.004 and 0.4 mm thickness. The simulations of this study are performed on CST Microwave Studio.
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