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<strong>Kağan</strong> <strong>Topallı</strong><br />
Educational Background<br />
2001-2007 Ph.D. in Dept. of Electrical and Electronics Eng. of Middle East Technical University (METU), Turkey<br />
Thesis Title: A monolithic phased array using RF MEMS technology<br />
Supervisors: Prof. Ozlem Aydin Civi and Prof. Tayfun Akin<br />
1997-2001 B.S. in Dept. of Electrical and Electronics Eng. of METU, Turkey<br />
Specialization Courses: Microwaves, Antennas, VLSI, and Telecommunications<br />
1990-1997 Atatürk Anatolian High School, Ankara, Turkey<br />
Work Experience<br />
02/2012 – Assistant Professor, <strong>TED</strong> <strong>Üniversitesi</strong>, Elektrik-Elektronik Müh. Böl.<br />
02/2010 – 02/2012 Post doctoral researcher at ElectroScience Lab, The Ohio State University<br />
06/2007 – 01/2010 Senior research engineer at MEMS Center, METU<br />
06/2001 – 07/2007 Research and Teaching assistant at Dept. of Electrical and Electronics Eng., METU<br />
07/2000 – 09/2000 Summer work at MEMS–VLSI Laboratory at METU<br />
06/2000 – 09/2000 Intern at ASELSAN Inc.<br />
08/1999 – 09/1999 Intern at ASELSAN Inc.<br />
Research Interest<br />
• THz sensors and arrays for imaging applications<br />
• RF MEMS component design including series/shunt switches, loaded/switched line phase shifters, reconfigurable<br />
impedance tuners for the applications from DC-100 GHz<br />
• MEMS device fabrication and microwave packaging<br />
• Monolithic/hybrid integration techniques of active and passive components<br />
• Reconfigurable antennas<br />
• Phased arrays<br />
• Metamaterials<br />
Research Projects Involved<br />
1. Traycer Diagnostics Inc., Development of a FPA for real-time THz imaging applications, Jan. 2010 – present<br />
2. ESL–CERF, Indirect impedance characterization of monolithic THz antennas, Jan. 2011 – July 2011<br />
3. Multi–University Research Initiative (MURI) grant from Office of Naval Research, DATE (III-N Devices<br />
and Architectures for Terahertz Electronics), June 2011 – present<br />
4. TUBITAK (The Scientific and Technical Research Council of Turkey), Development of RF Components with<br />
MEMS technology, March 2003-March 2005.<br />
5. DPT (State Planning Organization), Design and production of novel multi-function reconfigurable<br />
antenna/antenna arrays by micromachining technology, June 2003– Dec. 2005.<br />
6. COST 284-TUBİTAK Innovative Antennas for Emerging Terrestrial and Space-based Applications, Oct.2003–<br />
Oct.2006.<br />
7. AMICOM (Advanced MEMS For RF and Millimeter Wave Communications) Network of Excellence, Sixth<br />
Framework project, Jan.2004 –October 2007.<br />
8. TUBITAK (The Scientific and Technical Research Council of Turkey), Phased Array Antenna by RF-MEMS<br />
Technology, July 2005-July 2008<br />
9. ASELSAN-SSM, mm-wave RF-MEMS Production and Measurements, June 2006-June 2009<br />
10. COST IC0603 ASSIST - Antenna Systems & Sensors for Information Society Technologies, Oct. 2007 –<br />
11. DPT (State Planning Organization), Industrial Micro-Electro-Mechanical Systems, June 2001 – Nov. 2009<br />
Awards, Professional Service, and Memberships<br />
• Received the Young Scientist Award of URSI (Union of Radio Science-International) at the 30 th General<br />
Assembly in 2011.<br />
• Received the METU Thesis of the Year Award, given by Prof. Dr. Mustafa N. Parlar Education and Research<br />
Foundation in 2007.<br />
• Ranked 133 rd in the 1 st step and 863 rd in the 2 nd step university entrance examination over 1.5 million candidates in<br />
1997.
• Reviewer of IEEE Trans. Antennas and Propagation; IEEE Antennas and Wireless Prop. Letters; Elsevier Sensors<br />
and Actuators; IET Microwaves, Antennas, and Prop.; IET Electronics Letters; IET Micro & Nano Letters;<br />
Progress In Electromagnetics Research.<br />
• Founder Member of IEEE Solid-State Electron Devices Society METU Chapter.<br />
• Member of IEEE, IEEE MTT, and IEEE AP societies.<br />
Research Skills<br />
Cleanroom<br />
Testing/Post process<br />
observations<br />
Design and Modeling<br />
Publications<br />
Journals<br />
• 10 years of cleanroom experience. Actively involved in the development of RF MEMS<br />
process at METU; fabricated THz test antennas at NanoTech West Lab, The Ohio<br />
State University<br />
• Worked on 4” glass, quartz, silicon, and alumina wafers with thicknesses between<br />
150 µm-550 µm.<br />
• Lithography: EVG-620 and Karl Suss MA-56 mask aligners with various type of<br />
Shipley, AZ group photoresist, and polyimide as the sacrificial layer.<br />
• Metal deposition: sputtering (Ti, Cr, Au, Cu, Al, Si-Cr) and thermal evaporation (Cr,<br />
Au) and electroplating (Ni, Cu, Au) processes.<br />
• Dielectric deposition and patterning: silicon nitride deposition and patterning using<br />
STS PECVD and RIE equipments.<br />
• Wet etching: various metals and alloys (Ti, Cu, Au, Cr, Al, Ni-Cr, Si-Cr, SixNy).<br />
• Use of post processing observation equipments including Wyko surface profiler, SEM<br />
• Use of microwave test equipments up to 750 GHz including vector network analyzer<br />
(HP 8720D, Agilent E8361A), Cascade and Karl Suss manual probe stations for RF<br />
and DC measurements, Suss PMV 200 vacuum probe station.<br />
• HP-VEE, WinCal for automated measurements<br />
• EM Simulation Tools: Ansoft HFSS, Ansoft Ensemble, ADS Momentum, IE3D,<br />
Ansoft Maxwell 3D, CST Microwave Studio.<br />
• RF Circuit Simulation Tools: AWR Microwave Office, ADS, Filpro<br />
• MEMS Simulation Tool: Coventorware, Ansoft ePhysics<br />
• FPGA Design Tool: Xilinx, VHDL<br />
• VLSI Design Tool: Cadence Integrated Circuit Design Environment<br />
• Mathematical Modeling and Calculation Tools: MATLAB, Mathematica, Scientific<br />
Workplace<br />
1. K. Topalli, G. C. Trichopoulos, and K. Sertel, “An indirect impedance characterization method for monolithic<br />
THz antennas using coplanar probe measurements,” accepted for publication, IEEE Antennas and Wireless<br />
Propagation Letters.<br />
2. M. Unlu, K. Topalli, H. I. Atasoy, S. Demir, O. Aydin Civi, and T. Akin, “Hybrid Connection of RF MEMS and<br />
SMT Components in an Impedance Tuner,” International Journal of Electronics and Communications, vol. 64, no.<br />
8, pp. 748-756, August 2010.<br />
3. K. Topalli, E. Erdil, O. Aydin Civi, S. Demir, S. Koc, and T. Akin, “Tunable Dual-frequency RF MEMS<br />
Rectangular Slot Ring Antennas,” Sensors and Actuators A, vol. 156, no. 2, pp. 373-380, December 2009.<br />
4. K. Topalli, M. Unlu, H. I. Atasoy, O. A. Civi, S. Demir, and T. Akin, “Empirical Formulation of Bridge<br />
Inductance in Inductively Tuned RF MEMS Shunt Switches,” Progress In Electromagnetics Research, PIER 97,<br />
pp. 343-356, 2009.<br />
5. E. Ekmekci, K. Topalli, T. Akin, and G. Turhan-Sayan, “A Tunable Multi-Band Metamaterial Design Using<br />
Micro-Split SRR Structures,” Optics Express, vol. 17, no. 18, pp. 16046-58, August 2009.<br />
6. J. Perruisseau-Carrier, K. Topalli, and T. Akin, “Low-loss Ku-band Artificial Transmission Line with MEMS<br />
Tuning Capability,” IEEE Microwave and Wireless Components Letters, vol. 19, no. 6, pp. 377-379, June 2009.
7. E. Sagiroglu Topalli, K. Topalli, S. E. Alper, T. Serin, and T. Akin, “Pirani Vacuum Gauges using Silicon-onglass<br />
and Dissolved-wafer Processes for the Characterization of MEMS Vacuum Packaging,” IEEE Sensors<br />
Journal, vol. 9, no. 3, pp. 263-270, March 2009.<br />
8. K. Topalli, O. Aydin Civi, S. Demir, S. Koc, and T. Akin, “A Monolithic Phased Array using 3-bit DMTL RF<br />
MEMS Phase Shifters,” IEEE Trans. Microwave Theory and Tech., vol. 56, pp. 270-277, February 2008.<br />
9. E. Erdil, K. Topalli, M. Unlu, O. Aydin Civi, and T. Akin, “Frequency Tunable Microstrip Patch Antenna using<br />
RF MEMS Technology,” IEEE Trans. Antennas and Propagation, vol. 55, pp. 1193-1196, April 2007.<br />
10. K. Topalli, M. Unlu, S. Demir, O. Aydin Civi, S. Koc, and T. Akin, “New Approach for Modeling Distributed<br />
MEMS Transmission Lines,” IEE Proc.-Microw. Antennas Propag., vol. 153, no. 2, pp. 152-162, April 2006.<br />
International Conference Publications<br />
1. G. C. Trichopoulos, K. Topalli, H. L. Mosbacker, and K. Sertel, “A THz camera for real-time imaging<br />
applications,” IEEE National Aerospace and Conference, Dayton, OH, USA, July 2011.<br />
2. K. Topalli, G. C. Trichopoulos, and K. Sertel, “Design and characterization of a broadband focal plane array for<br />
THz imaging,” IEEE National Aerospace and Conference, Dayton, OH, USA, July 2011.<br />
3. K. Topalli, G. C. Trichopoulos, and K. Sertel, “An indirect impedance characterization method for monolithic<br />
double-slot antennas for THz sensors,” URSI General Assembly and Scientific Symposium, Istanbul, Turkey,<br />
August 2011.<br />
4. G. C. Trichopoulos, K. Topalli, and K. Sertel, “Imaging performance of a THz focal plane array,” IEEE AP-S<br />
International Symposium on Antennas and Propagation, Spokane, WA, USA, July 2011.<br />
5. K. Topalli, G. C. Trichopoulos, and K. Sertel, “An indirect impedance characterization method for monolithic<br />
THz antennas,” IEEE AP-S International Symposium on Antennas and Propagation, July 2011, Spokane, WA,<br />
USA.<br />
6. D. J. Burdette, J. Alverbro, Z. Zhang, P. Fay, Y. Ni, P. Potet, K. Sertel, G. Trichopoulos, K. Topalli, J. Volakis<br />
and H. L. Mosbacker, "Development of an 80 x 64 pixel, broadband, real-time THz imager", Proc. SPIE 8023,<br />
80230F, 2011.<br />
7. G. C. Trichopoulos, K. Topalli, K. Sertel, “A Broadband THz Focal Plane Array for Excised Tissue Imaging,”<br />
National Radio Science Meeting, Boulder, CO, USA, Jan. 2011.<br />
8. E. Ekmekci, K. Topalli, T. Akin, and G. Turhan-Sayan, “A Feasibility Study for Tunable Metamaterial Design<br />
Using Multi-Split SRR Structures and RF MEMS Switching,” IEEE AP-S International Symposium on Antennas<br />
and Propagation, June 2009, Charleston, SC, USA.<br />
9. E. Ekmekci, K. Topalli, T. Akin, and G. Turhan-Sayan, “Effects of Array Dimensions on the Resonance<br />
Characteristics of SRR Type Metamaterial Arrays with Small Sizes: Simulations and Experiments,” Progress in<br />
Electromagnetic Research Symposium, Moscow, Russia, August 2009,.<br />
10. K. Topalli, O. Bayraktar, M. Unlu, O. Aydin Civi, S. Demir, and T. Akin, “Reconfigurable antennas by RF<br />
MEMS technology,” 30 th ESA Antenna Workshop on Antennas for Earth Observation, Science,<br />
Telecommunications and Navigation Space Missions, pp.497-500, Noordwijk, The Netherlands, 27-30 May 2008.<br />
11. K. Topalli, M. Unlu, I. Istanbulluoglu, H. I. Atasoy, O. Bayraktar, O. Aydin Civi, S. Demir, S. Koc, and T. Akin,<br />
“Reconfigurable RF MEMS Devices and Antennas,” 5 th International Conference on Electrical and Electronics<br />
Engineering (ELECO 2007), pp. 204-209, Bursa, Turkey, 5-9 December 2007.<br />
12. O. Bayraktar, K. Topalli, M. Unlu, O. A. Civi, S. Demir, T. Akin, “Beam Switching Reflectarray using RF<br />
MEMS Technology,” The Second European Conference on Antennas and Propagation, Edinburgh, UK, 11-16<br />
November 2007.
13. K. Topalli, O. Aydin Civi, S. Demir, S. Koc, and T. Akin, “Monolithically integrated MEMS phased array,” 8 th<br />
Workshop on MEMS for MilimeterWave Communications (MEMSWAVE), pp. 119-122, Barcelona, Spain, 26-27<br />
June 2006.<br />
14. K. Topalli, O. Aydin Civi, S. Demir, S. Koc, and T. Akin, “Dual-Frequency Reconfigurable Slot Dipole Array<br />
with a CPW-Based Feed Network using RF MEMS Technology for X- and Ku-Band Applications,” 2007 IEEE<br />
AP-S International Symposium, Honololu, HI, June 10-15, 2007.<br />
15. O. Bayraktar, K. Topalli, M. Unlu, I. Istanbulluoglu, E. U. Temocin, H. I. Atasoy, O. A. Civi, S. Demir, S. Koc, T.<br />
Akin, “Reconfigurable Reflectarray using RF MEMS Technology,” European Conference on Antennas and<br />
Propagation, Nice, France, 6-10 November 2006.<br />
16. E. Erdil, K. Topalli, M. Unlu, I. Istanbulluoglu, E. U. Temocin, H. I. Atasoy, O. Bayraktar, O. A. Civi, S. Demir,<br />
S. Koc, T. Akin, “Reconfigurable Slot Antenna with Fixed-fixed Beam Type RF MEMS Capacitors,” European<br />
Conference on Antennas and Propagation, Nice, France, 6-10 November 2006.<br />
17. M. Unlu, K. Topalli, H. I. Atasoy, E. U. Temocin, I. Istanbulluoglu, O. Bayraktar, S. Demir, O. A. Civi, S. Koc,<br />
and T. Akin, “A Reconfigurable RF MEMS Impedance Tuner for Impedance Matching of a Two-Stage Low<br />
Noise Amplifier,” 7 th Workshop on MEMS for MilimeterWave Communications (MEMSWAVE), pp. 115-118,<br />
Orvieto, Italy, 27-30 June 2006.<br />
18. H. I .Atasoy, K. Topalli, M. Unlu, I. Istanbulluoglu, E. U. Temocin, O. Bayraktar, S. Demir, O. A. Civi, S. Koc<br />
and T. Akin, “Metal-to-metal and capacitive contact RF MEMS shunt switch structures,” 7 th Workshop on MEMS<br />
for MilimeterWave Communications (MEMSWAVE), pp. 154-156, Orvieto, Italy, 27-30 June 2006.<br />
19. H. I. Atasoy, K. Topalli, M. Unlu, I. Istanbulluoglu, O. Bayraktar, E. U. Temocin, S. Demir, O. A. Civi, S. Koc,<br />
and T. Akin, “Investigation of On-Wafer TRL Calibration Accuracy Dependence on Transitions and Probe<br />
Positioning,” European Microwave Conference 2006, Manchester, United Kingdom, pp. 1582-1585, 10-15<br />
September 2006.<br />
20. M. Unlu, K. Topalli, H. I. Atasoy, E. U. Temocin, I. Istanbulluoglu, O. Bayraktar, S. Demir, O. A. Civi, S. Koc,<br />
and T. Akin, “A Tunable RF MEMS Triple Stub Impedance Matching Network,” European Microwave<br />
Conference 2006, pp. 1370-1373, Manchester, United Kingdom, 10-15 September 2006.<br />
21. K. Topalli, M. Unlu, O. Aydin Civi, S. Demir, S. Koc, and T. Akin, “A Monolithic Phased Array using 3-Bit<br />
DMTL RF MEMS Phase Shifters,” 2006 IEEE AP-S International Symposium and USNC/URSI National Radio<br />
Science Meeting, pp. 517-520, July 9-14, 2006.<br />
22. M. Secmen, K. Topalli, M. Unlu, E. Erdil, O. Aydin Civi, A. Hizal, “Dual Wideband Antenna Analysis for Linear<br />
FMCW Radar Applications,” 2006 IEEE 14 th Signal Processing and Communications, pp. 1-4, 17-19 April 2006,<br />
Antalya, Turkey.<br />
23. K. Topalli, E. Erdil, O. Aydin Civi, “Reconfigurable Antenna Structures using MEMS technology,” URSI<br />
General Assembly and Scientific Symposium, New Delhi, India, 23-29 October 2005.<br />
24. E. Erdil, S. Onat, K. Topalli, I. Istanbulluoglu, M. Unlu, S. Demir, L. Alatan, O. Aydin Civi, S. Koc, and T. Akin,<br />
“Reconfigurable Antenna Structures using MEMS technology,” 6 th Workshop on MEMS for<br />
MilimeterWave Communications (MEMSWAVE), pp. 35-38, Lausanne, Switzerland, 23-24 June 2005.<br />
25. E. Erdil, K. Topalli, O. Aydin Civi, and T. Akin, “Reconfigurable CPW-fed dual frequeny rectangular slot<br />
antenna,” 2005 IEEE AP-S International Symposium and USNC/URSI National Radio Science Meeting,<br />
Washington D.C., vol.2A, pp. 392-395, 3-8 July 2005.<br />
26. M. Unlu, K. Topalli, S. Demir, O. Aydin Civi, S. Koc, and T. Akin, “A Parametric Modeling Study on<br />
Distributed MEMS Transmission lines,” European Microwave Conference 2004, Amsterdam, The Netherlands<br />
11-15 October 2004, pp.1157-1160.<br />
27. K. Topalli, M. Unlu H. Sagkol, S. Demir, O. Aydin Civi, S. Koc, and T. Akin, “A New Model for Distributed<br />
MEMS Transmission Lines,” 2004 AP-S International Symposium and USNC/URSI National Radio Science<br />
Meeting, Monterey, California, vol.3, pp.2855-2858, 20-25 June 2004.
28. K. Topalli, M. Unlu, S. Demir, O. Aydin Civi, S. Koc, and T. Akin, “A Parametric Modeling Study on<br />
Distributed MEMS Transmission Lines,” 5th Workshop on MEMS for MilimeterWave Communications<br />
(MEMSWAVE), pp. I13-I16, Uppsala, Sweden, 30 June-2 July 2004.<br />
29. M. Unlu, K. Topalli, S. Demir, O. Aydin Civi, S. Koc, and T. Akin, “Design and Modeling of a Reconfigurable<br />
Triple Stub Impedance Matching Network using Distributed MEMS Transmission Lines,” 5th Workshop on<br />
MEMS for MilimeterWave Communications (MEMSWAVE), pp. I17-I20, Uppsala, Sweden, 30 June-2 July 2004.<br />
30. K. Topalli, H. Sagkol, M. Unlu, S. Onat, O. Aydin Civi, S. Demir, S. Koc, L. Alatan, T. Akin, “Microwave<br />
Circuit Components and Reconfigurable Antennas Using RF MEMS Technology,” Proceeding of 4th COST284<br />
Management Committee Meeting & Workshop with INICA, Berlin-Germany, 19 September 2003.<br />
31. M. Unlu, K. Topalli, H. Sagkol, S. Demir, O. Aydin Civi, S. Koc, and T. Akin, “RF MEMS Adjustable<br />
Impedance Matching Network and Adjustable Power Divider,” 2002 IEEE AP-S International Symposium and<br />
USNC/URSI National Radio Science Meeting, pp. 26-29, San Antonio, Texas, 16-21 June 2002.<br />
32. M. Unlu, K. Topalli, H. Sagkol, S. Demir, O. Aydin Civi, S. Koc, and T. Akin, “New MEMS Switch Structures<br />
for Antenna Applications,” 2002 IEEE AP-S International Symposium and USNC/URSI National Radio Science<br />
Meeting, p.134, San Antonio, Texas, 16-21 June 2002.<br />
33. H. Sagkol, K. Topalli, M. Unlu, O. Aydin Civi, S. Koc, S. Demir, and T. Akin, “A Monolithic Phased Array with<br />
RF MEMS Technology,” 2002 IEEE AP-S International Symposium and USNC/URSI National Radio Science<br />
Meeting, pp. 760-763, San Antonio, Texas, 16-21 June 2002.<br />
National Conference Publications<br />
Dr. Topalli has authored/co-authored 14 national conference publications.
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