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Reflectarray with Variable-patch-and-slot SizeThe-Nan Chang and Bor-Tsong Chen doi:10.2529/PIERS070317040735 Downloads: 1345 Abstract:Reflectarray using a variable-patch-and-slot (VPS) size method is presented. A slot as a new variable is added to the original variable patch (VP) size configuration. The slot plays a role to modify the original phase diagram. In some cases, it optimizes both sensitivity and bandwidth of a reflectarray. Based on this observation, we designed a reflectarray on an FR4 substrate. Experimental results show a maximum gain of 24.5 dB at 11.4 GHz with an aperture size of 19.5 cm × 25 cm. It has a 1.5 dB bandwidth of 19.3% and has an aperture efficiency of 31.48%. The cross-polarization level is bellow 25 dB.References:1. Munson, R. E. and H. Haddad, "Microstrip reflectarray for satellite communication and RCS enhancement or reduction," , U.S. Patent 4,684,952, Washington, D.C., August, 1987. 2. Javor, R. D., X.-D. Wu, and K. Chang "Design and performance of a microstrip reflectarray antenna," IEEE Trans. Antennas Propagat., Vol. 43, No. 9, 932-939, Sep., 1995. 3. Targonski, S. D. and D. M. Pozar, "Analysis and design of a microstrip reflectarray using patches of variable size," IEEE Int. Symp. Antennas Propagat. Seattle, 1820-1823, WA, June, 1994. 4. Encinar, J. A., "Design of two layer printed reflectarrays using patches of variable size," IEEE Antennas and Propagation, Vol. 49, No. 10, 1403-1410, Oct., 2001. 5. Huang, J. and R. J. Pogorzelski, "A Ka-band microstrip reflectarray with elements having variable rotation angles," IEEE Trans. Antennas Propagat., Vol. 46, 650-656, May, 1998. 6. Chang, T. N. and Y. C. Wei, "Proximity-coupled reflectarray," IEEE Transactions on Antennas and Propagation, Vol. 52, No. 2, 631-635, Feb., 2004. 7. Chang, T. N. and H. Suchen, "Microstrip reflectarray with QUAD-EMC element," IEEE Transactions on Antennas and Propagation, Vol. 53, No. 6, 1993-1996, June, 2005. 8. Bozzi, M., S. Germani, and L. Perregrini "Performance comparison of different element shapes used in printed reflectarrays," IEEE Antennas and Wireless Propagation Letters, Vol. 2, 219-222, 2003. |
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