volume | PIER Journals

Abstract

In this paper, an optically transparent (OT) compact 4×4 Butler matrix (BM) operating at 2.4 GHz for Wi-Fi applications is proposed. The device has structured grids refined in quadrilateral cell shapes. The dimensions of cells are chosen based on a simple formulawhich guarantees a minimum required transparency levelin conjunction with a limited rounds of optimizations. A theoretical optical transparency value of 76.2% has been obtained without affecting the excellent electrical performance of the BM. Moreover, complimentary square split ring resonators (CS-SRRs) are patterned in the ground plane of each transparent transmission line in the BM. This loading technique provides a relative size reduction of 16.6% compared to a conventional structure. Simulated and measured results of the proposed design agree well with conventional BM's results. The proposed technique and its related features can be expanded to other microwave devices.

1. Tseng, C.-H., C.-J. Chen, and T.-H. Chu, "A low-cost 60-GHz switched-beam patch antenna array with butler matrix network," IEEE Antennas and Wireless Propagation Lett., Vol. 7, 432-435, 2008.
doi:10.1109/LAWP.2008.2001849 Google Scholar

2. Chang, C.-C., R.-H. Lee, and T.-Y. Shih, "Design of a beam switching/steering butler matrix for phased array system," IEEE Transactions on Antennas and Propagation, Vol. 58, No. 2, 367-374, Feb. 2010.
doi:10.1109/TAP.2009.2037693 Google Scholar

3. Gandini, E., M. Ettorre, R. Sauleau, and A. Grbic, "A lumped-element unit cell for beam-forming networks and its application to a miniaturized butler matrix," IEEE Transactions on Microwave Theory and Techniques, Vol. 61, No. 4, 1477-1487, Apr. 2013.
doi:10.1109/TMTT.2013.2248744 Google Scholar

4. Bona, M., L. Manholm, J. P. Starski, and B. Svensson, "Low-loss compact Butler matrix for a microstrip antenna," IEEE Transactions on Microwave Theory and Techniques, Vol. 50, 2069-2075, Sept. 2002.
doi:10.1109/TMTT.2002.802318 Google Scholar

5. Wang, C.-W., T.-G. Ma, and C.-F. Yang, "A new planar artificial transmission line and its applications to a miniaturized butler matrix," IEEE Transactions on Microwave Theory and Techniques, Vol. 55, No. 12, 2792-2801, Dec. 2007.
doi:10.1109/TMTT.2007.909474 Google Scholar

6. Denidni, T. A. and T. E. Libar, "Wide band four-port butler matrix for switched multibeam antenna arrays," 14th IEEE Proceedings on Personal, Indoor and Mobile Radio Communications 2003, PIMRC 2003, Vol. 3, 2461-2464, Sept. 7-10, 2003. Google Scholar

7. Abu Safia, O., L. Talbi, and K. Hettak, "A new type of transmission line-based metamaterial resonator and its implementation in original applications," IEEE Trans. on Magnetics, Vol. 49, 968-973, Mar. 2013.
doi:10.1109/TMAG.2012.2230248 Google Scholar

8. Abu Safia, O., "Development of new types of transmission line-based metamaterial inclusions/cells and their applications,", doctoral dissertation, University of Quebec, Gatineau, QC, Canada, Sept. 2014. Google Scholar

9. Hautcoeur, J., X. Castel, F. Colombel, R. Benzerga, M. Himdi, G. Legeay, and E. Motta Cruz, "Transparency and electrical properties of meshed metal films," Thin Solid Films, Vol. 519, 3851-3858, 2011.
doi:10.1016/j.tsf.2011.01.262 Google Scholar

10. Hautcoeur, J., F. Colombel, X. Castel, M. Himdi, and E. Motta Cruz, "Optically transparent monopole antenna with high radiation efficiency manufactured with silver grid layer (AgGL)," Electronics Letters, Vol. 45, No. 20, 1014-1016, Sept. 2009.
doi:10.1049/el.2009.1218 Google Scholar

11. Lee, E. N., R. Hall, G. Katulka, K. Duncan, E. Barry, P. Pa, M. Mirotznick, P. Patel, and L. Holmes, "Modeling, simulation, and measurement of a transparent armor embedded meshed microstrip antenna," 2012 IEEE Antennas and Propagation Society International Symposium (APSURSI), 1-2, Jul. 8-14, 2012. Google Scholar

12. Hautcoeur, J., L. Talbi, K. Hettak, and M. Nedil, "60 GHz optically transparent microstrip antenna made of meshed AuGL material," IET Microwaves, Antennas & Propagation, Vol. 8, 1091-1096, Oct. 2014. Google Scholar

13. Colombel, F., X. Castel, M. Himdi, G. Legeay, S. Vigneron, and E. M. Cruz, "Ultrathin metal layer, ITO film and ITO/Cu/ITO multilayer towards transparent antenna," IET Sci., Meas. Technol., Vol. 3, No. 3, 229-234, May 2009.
doi:10.1049/iet-smt:20080060 Google Scholar

14. Saha, C., J. Y. Siddiqui, and Y. M. M. Antar, "Square split ring resonator backed coplanar waveguide for filter applications," 2011 XXXth URSI General Assembly and Scientific Symposium, 1-4, Aug. 13-20, 2011. Google Scholar

Dr. Ousama Abu Safia

Prof. Mourad Nedil

Dr. Mustapha Yagoub

Dr. Walid Yusuf