# PUBLICATIONS

*(By CEMMETU Members Since 16 May 2013)*

**Journal Papers**

[1] Y. E. Tunçyürek, B. Karaosmanoğlu, and Ö. Ergül, “Computational design of optical couplers for bended nanowire transmission lines,” ACES J., submitted for publication.

[2] A. Altınoklu, B. Karaosmanoğlu, and Ö. Ergül, “Electromagnetic optimizations of corrugated metallic sheets for maximum power focusing,” J. Electromagn. Waves Appl., submitted for publication.

[3] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “Accurate and efficient analysis of plasmonic structures using surface integral equations,” IEEE Trans. Antennas Propag., submitted for publication.

[4] F. Mutlu, C. Önol, B. Karaosmanoğlu, and Ö. Ergül, “Inkjet-printed cage-dipole antennas for radio-frequency applications,” IET Microwaves, Antennas & Propagation, submitted for publication.

[5] B. Karaosmanoğlu and Ö. Ergül, “EFIE-tuned testing functions for MFIE and CFIE,” IEEE Antennas Wireless Propag. Lett., accepted for publication.

[6] B. Karaosmanoğlu and Ö. Ergül, “Generalized hybrid surface integral equations for finite periodic perfectly conducting objects,” IEEE Antennas Wireless Propag. Lett., accepted for publication.

[7] B. Karaosmanoğlu, S. Küçük, and Ö. Ergül, “Fine-tuning snowflake fractal antennas,” Int. J. Numer. Model., no. e2212, Jan. 2017.[8] S. Güler, B. Karaosmanoğlu, and Ö. Ergül, “Design, simulation, and fabrication of a novel type of inkjet-printed pixel antennas,” PIER Lett., vol. 64, pp. 51–55, Nov. 2016.

[9] B. Karaosmanoğlu, A. Altınoklu, and Ö. Ergül, “Numerical constructions of testing functions for improving the accuracy of MFIE and CFIE,” Prog. Electromagn. Res. M, vol. 51, pp. 63–70, Oct. 2016.

[10] C. Önol, S. Alkış, Ö. Gökçe, and Ö. Ergül, “Multi-frequency and multi-direction optimizations of antenna arrays using heuristic algorithms and the multilevel fast multipole algorithm,” Radio Sci., vol. 51, no. 7, pp 1094–1108, Jul. 2016.

[11] M. Takrimi, Ö. Ergül, and V. B. Ertürk, “A novel broadband multilevel fast multipole algorithm with incomplete-leaf tree structures for multiscale electromagnetic problems,” IEEE Trans. Antennas Propag., vol. 64, no. 6, pp. 2445–2456, Jun. 2016.

[12] B. Karaosmanoğlu, A. Yılmaz, U. M. Gür, and Ö. Ergül, “Solutions of plasmonic structures using the multilevel fast multipole algorithm,” Special Issue on Challenges in RF and Microwave Defense Engineering, Int. J. RF Microwave Comput.-Aided. Eng., vol. 26, no. 4, pp. 335–341, May 2016.

[13] C. Önol, B. Karaosmanoğlu, and Ö. Ergül, “Efficient and accurate electromagnetic optimizations based on approximate forms of the multilevel fast multipole algorithm,” IEEE Antennas Wireless Propag. Lett., vol. 15, pp. 1113–1115, Apr. 2016.

[14] A. E. Ofluoğlu, T. Çiftçi, and Ö. Ergül, “Magnetic-field integral equation,” IEEE Antennas Propag. Mag., vol. 57, no. 4, pp. 134–142, Aug. 2015.

[15] Ö. Ergül and B. Karaosmanoğlu, “Broadband multilevel fast multipole algorithm based on an approximate diagonalization of the Green’s function,” IEEE Trans. Antennas Propag., vol. 63, no. 7, pp. 3035–3041, Jul. 2015.

[16] A. Yılmaz, B. Karaosmanoğlu, and Ö. Ergül, “Computational electromagnetic analysis of deformed nanowires using the multilevel fast multipole algorithm,” Sci. Rep., vol. 5, no. 8469, Feb. 2015.

[17] C. Önol and Ö. Ergül, “Optimizations of patch antenna arrays using genetic algorithms supported by the multilevel fast multipole algorithm,” Radioengineering, vol. 23, no. 4, pp. 1005–1014, Dec. 2014.

[18] Ö. Ergül and B. Karaosmanoğlu, “Approximate stable diagonalization of the Green’s function for low frequencies,” IEEE Antennas Wireless Propag. Lett., vol. 13, pp. 1054–1056, 2014.

[19] Ö. Ergül and B. Karaosmanoğlu, “Low-frequency fast multipole method based on multiple-precision arithmetic,” IEEE Antennas Wireless Propag. Lett., vol. 13, pp. 975–978, 2014.

**Books**

[1] Ö. Ergül and L. Gürel, The Multilevel Fast Multipole Algorithm (MLFMA) for Solving Large-Scale Computational Electromagnetics Problems. Wiley-IEEE, 2014.

[2] Ö. Ergül, Guide to Programming and Algorithms Using R. London: Springer, 2013.

**International Conference Papers**

[1] C. Önol, A. Üçüncü, and Ö. Ergül, “Multilayer iterative solutions of large-scale electromagnetic problems using MLFMA,” in Proc. Fourth International EMC Conference, 2017.

[2] H. İbili, B. Karaosmanoğlu, and Ö. Ergül, “Design and fabrication of low-cost inkjet printed metamaterials,” in Proc. Fourth International EMC Conference, 2017.

[3] A. Altınoklu and Ö. Ergül, “Shape optimizations of metallic sheets for improved near-zone scat- tering, reflection, and focusing characteristics,” in Proc. European Microwave Conf. (EuMC), 2017.

[4] A. Altınoklu and Ö. Ergül, “Computational analysis and full-wave optimizations of nanoantenna arrays for desired scattering and radiation characteristics,” in URSI General Assembly and Scientific Symposium (URSI-GASS), 2017.

[5] C. Önol, A. Üçüncü, and Ö. Ergül, “Efficient three-layer iterative solutions of electromagnetic problems using the multilevel fast multipole algorithm,” in IEEE MTT-S Int. Conf. Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO), 2017.

[6] B. Karaosmanoğlu, H. A. Şatana, and Ö. Ergül, “Investigation of alternative array configurations of nanowires for maximum power transmission at optical frequencies,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2017.

[7] S. Güler, C. Önol, Ö. Ergül, E. Sever, F. Dikmen, and Y. A. Tuchkin, “Fastly converging 2D solutions of TE-EFIE on modified superformula contours optimized via genetic algorithms,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2017.

[8] U. M. Gür, E. Üstün, Ö. Eroğlu, Ö. Ergül, “Computational demonstration of multiband nanoantennas for power enhancement,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2017.

[9] S. Güler, C. Önol, Ö. Ergül, E. Sever, F. Dikmen, and Y. A. Tuchkin, “Modified superformula contours optimized via genetic algorithms for exponentially converging 2D solutions of MFIE,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2017.

[10] B. Karaosmanoğlu and Ö. Ergül, “Accuracy of the surface integral-equation formulations for large negative permittivity values,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2017.

[11] E. Üstün, Ö. Eroğlu, U. M. Gür, and Ö. Ergül, “Investigation of nanoantenna geometries for maximum field enhancements at optical frequencies,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2017.

[12] B. Karaosmanoğlu and Ö. Ergül, “Modified combined tangential formulation for stable and accurate analysis of plasmonic structures,” in Proc. Int. Applied Computational Electromagnetics Soc. Symp., 2017.

[13] B. Karaosmanoğlu, S. Güler, H. İbili, and Ö. Ergül, “Inkjet-printed pixel antennas with hexagonal cells,” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2017, pp. 2022–2025.[14] C. Önol, A. Üçüncü, B. Karaosmanoğlu, and Ö. Ergül, “Nested iterative solutions of electromagnetic problems using approximate forms of the multilevel fast multipole algorithm,” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2017, pp. 1109–1112.

[15] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “Development and application of a broadband multilevel fast multipole algorithm for challenging multiscale problems,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2016, pp. 4713–4716.

[16] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “On the accuracy and efficiency of surface formulations in fast analysis of plasmonic structures via MLFMA,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2016, pp. 2629–2633.

[17] B. Karaosmanoğlu, C. Önol, S. Güler, A. Altınoklu, and Ö. Ergül, “Full-wave electromagnetic optimizations using surface integral equations and the multilevel fast multipole algorithm,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2016, pp. 262–266.

[18] A. Yılmaz, B. Karaosmanoğlu, and Ö. Ergül, “Analysis of optical properties of nanowires using surface integral equations and the multilevel fast multipole algorithm,” in Proc. Advanced Electromagnetic Symp., 2016.

[19] Ö. Ergül, B. Karaosmanoğlu, M. Takrimi, and V. B. Ertürk, “Broadband multilevel fast multipole algorithm for large-scale problems with nonuniform discretizations,” in Proc. Int. Symp. on Electromagnetic Theory (EMTS), 2016, pp. 284–287.

[20] S. Güler, C. Önol, Ö. Ergül, M. E. Hatipoğlu, E. Sever, F. Dikmen, and Y. A. Tuchkin, “Modified superformula contours optimized via genetic algorithms for fastly converging 2D solutions of EFIE,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2016, pp. 1333–1334.

[21] A. Altınoklu, B. Karaosmanoğlu, and Ö. Ergül, “Full-wave electromagnetic optimizations of corrugated metallic sheets,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2016, pp. 1325–1326.

[22] B. Karaosmanoğlu and Ö. Ergül, “Improving the accuracy of MFIE and CFIE by using numerically designed testing functions,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2016, pp. 317–318.

[23] T. Çiftçi, B. Karaosmanoğlu, and Ö. Ergül, “Low-cost inkjet antennas for RFID applications [extended],” IOP Conf. Ser.: Mater. Sci. Eng., vol. 120, no. 1, Apr. 2016.

[24] B. Karaosmanoğlu and Ö. Ergül, “Numerical design of testing functions for the magnetic-field integral equation,” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2016.

[25] M. Akbaş, L. Alatan, and Ö. Ergül, “Accuracy and efficiency improvements in iterative hybridization of the method of moments (MoM) and physical optics (PO),” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2016.

[26] M. Takrimi, Ö. Ergül, and V. B. Ertürk, “A broadband multilevel fast multipole algorithm with incomplete-leaf tree structures for multiscale electromagnetic problems,” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2016.

[27] T. Çiftçi, B. Karaosmanoğlu, and Ö. Ergül, “Low-cost inkjet antennas for RFID applications,” in Proc. IEEE Radio and Antenna Days of the Indian Ocean, 2015.

[28] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “Full-wave analysis of three-dimensional optical metamaterials involving deformed nanowires,” in Proc. Int. Cong. on Advanced Electromagnetic Materials in Microwaves and Optics (Metamaterials), 2015, pp. 136–138.

[29] Ö. Ergül, C. Önol, and B. Karaosmanoğlu, “Optimizations of EFIE and MFIE combinations in hybrid formulations of conducting bodies,” in Proc. Int. Conf. on Electromagnetics in Advanced Applications (ICEAA), 2015, pp. 1276–1279.

[30] Ö. Ergül and B. Karaosmanoğlu, “Broadband MLFMA based on an approximate diagonalization of the three-dimensional Green’s function,” in Proc. Int. Conf. on Electromagnetics in Advanced Applications (ICEAA), 2015, pp. 1272–1275.

[31] B. Karaosmanoğlu, A. Yılmaz, U. M. Gür, and Ö. Ergül, “Solutions of plasmonic structures using the multilevel fast multipole algorithm,” in Proc. Third International EMC Conference, 2015.

[32] Ö. Ergül, B. Karaosmanoğlu, and C. Önol, “Electromagnetic optimizations using heuristic algorithms combined with the ordinary and approximate forms of the multilevel fast multipole algorithm,” in Proc. Int. Conf. on Matrix Methods in Mathematics and Applications (MMMA), 2015, pp. 37–38.

[33] B. Karaosmanoğlu and Ö. Ergül, “Hybrid surface integral equations for optimal analysis of perfectly conducting bodies,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2015, pp. 1160–1161.

[34] C. Önol, B. Karaosmanoğlu, and Ö. Ergül, “Antenna switch optimizations using genetic algorithms accelerated with the multilevel fast multipole algorithm,” in Proc. IEEE Antennas and Propagation Soc. Int. Symp., 2015, pp. 1338–1339.

[35] C. Önol, T. Çiftçi, S. Küçük, B. Karaosmanoğlu, and Ö. Ergül, “Design, simulation, and fabrication of low-cost inkjet antennas,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2015, pp. 2829–2833.

[36] C. Önol, Ö. Gökçe, H. Boyacı, and Ö. Ergül, “Rigorous optimizations of three-dimensional antenna arrays using full-wave simulations,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2015, pp. 2230–2234.

[37] B. Karaosmanoğlu, U. M. Gür, and Ö. Ergül, “Investigation of nanoantennas using surface integral equations and the multilevel fast multipole algorithm,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2015, pp. 2026–2030.

[38] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “Rigorous analysis of deformed nanowires using the multilevel fast multipole algorithm,” in Proc. European Conf. on Antennas and Propagation (EuCAP), 2015.

[39] Ö. Ergül and B. Karaosmanoğlu, “Using multiple-precision arithmetic to prevent low-frequency breakdowns in the diagonalization of the Green’s function,” in Proc. Progress in Electromagnetics Research Symp. (PIERS), 2014, pp. 2311–2315.

[40] Ö. Ergül and B. Karaosmanoğlu, “Low-frequency multilevel fast multipole algorithm using an approximate diagonalization of the Green’s function,” in Proc. XXXI URSI General Assembly and Scientific Symp. of Int. Union of Radio Science, 2014.

[41] B. Karaosmanoğlu and Ö. Ergül, “Stabilization of the fast multipole method for low frequencies using multiple-precision arithmetic,” in Proc. XXXI URSI General Assembly and Scientific Symp. of Int. Union of Radio Science, 2014.

[42] Ö. Ergül, “Fast full-wave solutions of realistic metamaterial structures,” in Proc. Ninth Int. Conf. on Computation in Electromagnetics, 2014.

[43] Ö. Ergül, “Parallel multilevel fast multipole algorithm for complex plasmonic metamaterial structures,” in Proc. Int. Conf. on Electronics, Computer and Computation (ICECCO), 2013, pp. 343–346.

**International Conference Abstracts**

[1] M. Takrimi, Ö. Ergül, and V. B. Ertürk, “Incomplete-leaf multilevel fast multipole algorithm for penetrable objects using volume integral equations,” IEEE Antennas and Propagation Soc. Int. Symp., Jun. 2016.

[2] M. Akbaş, L. Alatan, and Ö. Ergül, “Accuracy and efficiency improvement in EI-MoM-PO hybrid method,” Integral Techniques for Electromagnetics (INTELECT), Cappadocia, Turkey, Sep. 2015.

[3] M. Takrimi, Ö. Ergül, and V. B. Ertürk, “Fast and accurate solutions of multiscale problems using incomplete leaf MLFMA,” Integral Techniques for Electromagnetics (INTELECT), Cappadocia, Turkey, Sep. 2015.

[4] B. Karaosmanoğlu, T. Çiftçi, and Ö. Ergül, “Challenges in low-cost inkjet antennas,” IEEE Antennas and Propagation Soc. Int. Symp., Vancouver, BC, Canada, Jul. 2015, p. 181.

[5] B. Karaosmanoğlu and Ö. Ergül, “Broadband implementation of MLFMA using approximate scaled diagonalization of the Green’s function,” URSI Atlantic Radio Science Conf. (URSI AT-RASC), Gran Canaria, Canary Islands, May 2015.

[6] C. Önol, Ö. Gökçe, and Ö. Ergül, “Dual-band antenna array optimizations using heuristic algorithms and the multilevel fast multipole algorithm,” in Proc. URSI Atlantic Radio Science Conf. (URSI AT-RASC), Gran Canaria, Canary Islands, May 2015.

**National Conference Papers**

[1] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “Fast and accurate analysis of plasmonic structures at optical frequencies using the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[2] N. Hosseini, C. Önol, and Ö. Ergül, “Optimizations and simulations of three-dimensional finite photonic crystal structures with the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[3] C. Önol and Ö. Ergül, “Full-wave electromagnetic optimizations via genetic algorithms and the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[4] U. M. Gür and Ö. Ergül, “Analysis of low-frequency-breakdown-resistant potential formulations using the method of moments” in Turkish, URSI-Turkey Scientific Symp., 2016.

[5] M. Akbaş, L. Alatan, and Ö. Ergül, “Improving the accuracy and efficiency of the hybrid method of moments and physical optics,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[6] U. M. Gür, İ. E. Üstün, and Ö. Ergül, “Analysis of electromagnetic power enhancement factors of nanoantennas using surface integral equations,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[7] F. Mutlu, B. Karaosmanoğlu, and Ö. Ergül, “Design and measurement of inkjet-printed antennas for radio-frequency-identification applications,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[8] B. Karaosmanoğlu and Ö. Ergül, “Design of numerical testing functions for the magnetic-field integral equation,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[9] B. Karaosmanoğlu, H. İbili, and Ö. Ergül, “Design and fabrication of low-cost metamaterials via inkjet printing technique,” in Turkish, URSI-Turkey Scientific Symp., 2016.

[10] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “Accurate full-wave simulations of nanowires at optical frequencies using the multilevel fast multipole algorithm,” Nanoscience & Nanotechnology Conf. (NanoTR), Ankara, Turkey, 2015.

[11] B. Karaosmanoğlu and Ö. Ergül, “A broadband multilevel fast multipole algorithm based on the scaled diagonalization of the Green’s function,” in Turkish, URSI-Turkey Scientific Symp., 2014.

[12] B. Karaosmanoğlu, U. M. Gür, and Ö. Ergül, “Accurate analysis of nanoantennas with plasmonic properties using surface integral equations,” in Turkish, URSI-Turkey Scientific Symp., 2014.

[13] B. Karaosmanoğlu, A. Yılmaz, and Ö. Ergül, “Fast and accurate analysis of nanowires with the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey Scientific Symp., 2014.

[14] C. Önol, İ. Genel, B. Eliş, and Ö. Ergül, “Design of patch antenna arrays using genetic algorithms and the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey Scientific Symp., 2014.

[15] F. A. Tunç, F. Gökçe, C. Önol, B. Karaosmanoğlu, and Ö. Ergül, “Design and simulations of inkjet-type antennas suitable for printing on paper,” in Turkish, URSI-Turkey Scientific Symp., 2014.

[16] T. Çiftçi, A. Erol, and Ö. Ergül, “Accurate full-wave simulations of three-dimensional finite photonic crystal structures,” in Turkish, URSI-Turkey Scientific Symp., 2014.

[17] T. Çiftçi, A. E. Ofluoğlu, and Ö. Ergül, “Simulations of fishnet-type optical metamaterials using surface integral equations and the multilevel fast multipole algorithm,” in Turkish, URSI-Turkey Scientific Symp., 2014.

**Unpublished Research Reports**

[1] H. Boyacı, C. Önol, and Ö. Ergül, “Optimizations of antenna arrays using particle swarm optimization methods,” CEMMETU, Middle East Technical University, pp. 1–5, Jun. 2015. PDF

**Thesis**

[1] Feza Mutlu, MS Thesis, Design, Simulation, and Fabrication of Low-Cost Inkjet Antennas, 2016.

[2] Can Önol, MS Thesis, Optimizations of Antennas Using Heuristic Algorithms Supported by The Multilevel Fast Multipole Algorithm, 2015.

**Collections**