RCS reduction and gain enhancement of SRR inspired circularly polarized slot antenna using metasurface |
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| Institution: | 1. Deptt. of Electronics Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India;2. Deptt. of Electronics and Communication, Bharati Vidyapeeth''s College of Engineering, New Delhi 110063, India;3. School of Computational and Integrative Sciences, Jawaharlal Nehru University, New Delhi 110067, India;1. Iskenderun Technical University, Department of Electrical and Electronics Engineering, 31200, Iskenderun, Hatay, Turkey;2. Cukurova University, Department of Physics, Saricam, Adana 01330, Turkey;3. Department of Electrical and Electronics Engineering, Middle East Technical University – Northern Cyprus Campus (METU-NCC), Kalkanli, Guzelyurt, TRNC/Mersin 10, Turkey;4. Kalkanli Technology Valley (KALTEV), Middle East Technical University – Northern Cyprus Campus (METU-NCC), Kalkanlı, Guzelyurt, TRNC/Mersin 10, Turkey;1. Electrical Engineering Department, Iran University of Science and Technology, Tehran, Iran;2. School of New Technologies, Iran University of Science and Technology, Tehran, Iran |
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| Abstract: | In this work, a novel Circularly Polarized (CP) slot antenna is proposed for low RCS and high gain applications. The proposed antenna is designed in two phases. Initially, a metasurface is designed, which is composed of two similar artificial magnetic conductor (AMC) unit cells arranged orthogonally in chessboard-like configuration for broadband RCS reduction. Then, the CP slot antenna is designed by placing dual SRR on the backside of the slot for impedance matching and to achieve circular polarization. Detailed analysis is conducted to investigate the performance of metasurface loaded CP slot antenna. The proposed antenna shows 10 dB RCS reduction over the bandwidth of 41.3% at boresight direction compared to CP slot antenna. The maximum in-band and out-of-band RCS reduction achieved is 24 dB and 20 dB, respectively. The maximum gain of the antenna is also increased by 2.7 dB as a result of parasitic radiation of the metasurface and an improvement in overall performance of the antenna is observed by the employment of metasurface. Measured results of the fabricated prototype are in good agreement with the simulated results. |
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| Keywords: | Circular polarization Radar cross section (RCS) Metasurface High gain Slot antenna Split Ring Resonator (SRR) |
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