نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشیار، دانشگاه شهید مدنی آذربایجان ، تبریز ، ایران
2 کارشناسی ارشد، دانشگاه شهید مدنی آذربایجان ، تبریز ، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In this article, an effective method to reduce the radar cross section with wide frequency band coverage in both in-band and out-band for a microstrip E-plane linear antenna array is presented. In this study, radiation patches are defined close to each other so that in addition to array compression and impedance matching control, mutual-coupling should also be considered in reducing the radar cross section. In the presented method, unlike most space-consuming and multi-layered methods with high thickness and complexity in construction and design, including all types of metasurfaces and parasitic frequency selective structures, an array of consecutive slots is used in the body of the patches, so that a set of reflected waves with variable and controllable amplitude and phase towards the receiving radar can be obtained. Studies on the key parameters, such as the number, length, and distances between the slots, show that the result of reflected waves to the radar can be minimized in a wide frequency band around the resonance frequency of the antenna. Also, to maintain the impedance and radiation characteristics, a new positioning is done for the feeding coaxial cable. To validate this method, two arrays with and without slots are fabricated and measured. The measurement of the radar cross-section in monostatic mode shows a reduction of at least 10dB in the frequency range of 1.9 to 11.2GHz, impedance matching over 25dB and efficiency and gain more than 75% and 4.5dB, respectively. The reduction of the radar cross section for the incident angle up to 30degrees and in bi-static mode can be seen in the entire band
کلیدواژهها [English]
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