Abstract:To reduce Radar Cross-Section (RCS), improve operation bandwidth, this paper proposes an innovative Salisbury screen based on time-controlled surface and researches the frequency shifting of UHF radar signal. First, a reflective modulation board which is composed of adjustable impedance sheet, dielectric spacer and grounded slab is presented by using the controllability of electromagnetic properties. Second, the equivalent circuit of dynamic two-phase transmission line is established, and an inductance layer is loaded on a periodic Frequency Selective Surface (FSS). Theoretical derivation and simulation results show that Salisbury screen can realize the spectrum shifting for UHF radar signal with large bandwidth, multi-directional, as well as different polarizations. Moreover, this screen can reduce RCS and detection probability of the long distance moving target.
KNOTT E F, TULEY M T, and SHAEFFER J F. Radar Cross Section[M]. 2nd Edition, Norwood, Artech House, 1993.
[2]
WANG C, CHEN M, LEI H, et al. Radar stealth and mechanical properties of a broadband radar absorbing structure[J]. Composites Part B: Engineering, 2017, 123: 19-27. doi: 10.1016/j.compositesb.2017.05.005.
[3]
PANG Y, CHENG H, ZHOU Y, et al. Ultrathin and broadband high impedance surface absorbers based on metamaterial substrates[J]. Optics Express, 2012, 20(11): 12515-12520. doi: 10.1364/OE.20.012515.
[4]
LI W, CHEN M, ZENG Z, et al. Broadband composite radar absorbing structures with resistive frequency selective surface: Optimal design, manufacturing and characterization[J]. Composites Science and Technology, 2017, 145: 10-14. doi: 10.1016/j.compscitech.2017.03.009.
[5]
CALAOZ C and ITOH T. Electromagnetic Metamaterials: Transmission Line Theory and Microwave Applications[M]. Wiley, 2006: 105-140.
ZHOU Yulong, CAO Xiangyu, GAO Jun, et al. Dualband frequency selective surface and its application to wideband RCS reduction of the microstrip antenna[J]. Journal of Electronics & Information Technology, 2017, 39(6): 1446-1451. doi: 10.11999/JEIT160854.
[7]
WU T K. Frequency Selective Surface and Grid Array[M]. New York: Wiley, 1995: 1-10.
[8]
BOZZI M, PERRENGRINI L, WEINZIERL J, et al. Design, fabrication and measurement of frequency-selective surfaces [J]. Optical Engineering, 2000, 39(8): 2263-2269. doi: 10.1117 /1.1305261.
LU Bao, GONG Shuxi, LING Jin, et al. A novel frequency selective surface structure and its application to RCS reduction of antennas[J]. Journal of Electronics & Information Technology, 2010, 32(1): 199-202. doi: 10.3724/ SP.J.1146.2009.00046.
[10]
XU H, BIE S, XU Y, et al. Broad bandwidth of thin composite radar absorbing structures embedded with frequency selective surfaces[J]. Composites Part A: Applied Science and Manufacturing, 2016, 80: 111-117. doi: 10.1016/ j.compositesa.2015.10.019.
[11]
COSTA F, MONORCHIO A, and MANARA G. Analysis and design of ultra thin electromagnetic absorbers comprising resistively loaded high impedance surfaces[J]. IEEE Transactions on Antennas and Propagation, 2010, 58(5): 1551-1558. doi 10.1109/TAP.2010.2044329.
[12]
GILL N, PUTHUCHERI S, SINGH D, et al. Critical analysis of frequency selective surfaces embedded composite microwave absorber for frequency range 2-8 GHz[J]. Journal of Materials Science: Materials in Electronics, 2017, 28(2): 1259-1270.
[13]
ZENG X, ZHANG L, WAN G, et al. Tunable and broadband radar absorber based on PIN diodes controllable FSS[C]. 11th International Symposium on Antennas, Propagation and EM Theory (ISAPE), Guilin, China, 2016: 720-722.
[14]
QI K, YUAN X, and WANG Y. A tunable microwave absorber based on active frequency selective surface[C]. Progress in Electromagnetics Research Symposium Proceedings, Guangzhou, China, 2014: 791-793.
[15]
COSTA F, GENOVESI S, and MONORCHIO A. A frequency selective absorbing ground plane for low-RCS microstrip antenna arrays[J]. Progress in Electromagnetics Research, 2012, 126: 317-332. doi: 10.2528/PIER12012904.
[16]
WANG H, KONG P, CHENG W, et al. Broadband tunability of polarization-insensitive absorber based on frequency selective surface[J]. Scientific Reports, 2016, 6: 1-8. doi: 10.1038/srep23081.
[17]
WANG Y and TENNANT A. Time-modulated reflector array[J]. Electronics Letters, 2012, 48(16): 972-974. doi: 10.1049/el.2012.1893.
[18]
WANG Y and TENNANT A. Experimental time-modulated reflector array[J]. IEEE Transactions on Antennas and Propagation, 2014, 62(12): 6533-6536. doi: 10.1109/TAP. 2014.2362129.