Publications
Books
Modeling and Characterization of RF and Microwave Power FETs
by P. H. Aaen, J. A. Plá, and J. Wood,
This book is a comprehensive exposition of FET modeling, and is a musthave resource for seasoned professionals and new graduates in the RF and microwave power amplifier design and modeling community. In it, you will find descriptions of characterization and measurement techniques, analysis methods, and the simulator implementation, model verification and validation procedures that are needed to produce a transistor model that can be used with confidence by the circuit designer. Written by semiconductor industry professionals with many years’ device modeling experience in LDMOS and IIIV technologies, this was the first book to address the modeling requirements specific to highpower RF transistors. A technologyindependent approach is described, addressing thermal effects, scaling issues, nonlinear modeling, and inpackage matching networks. These are illustrated using the current marketleading highpower RF technology, LDMOS, as well as with IIIV power devices
Cambridge University Press, 2007.
Book Chapters
An Introduction to Evolutionary Optimization for Microwave Engineering. Wiley Encyclopedia of Electrical and Electronics Engineering
by L. Zhang, P. H. Aaen, T. Dhaene, S. Abhishek, and V. Devabhaktuni,
This chapter overviews the fundamentals of evolutionary optimization as compared with conventional optimization techniques. We introduce evolutionary concepts through the simple genetic algorithm (SGA), particle swarm optimization (PSO), and present introductory examples demonstrating their use in microwave engineering.
John Wiley & Sons, Inc., 2015.
Journals
 A. Sahu, P. H. Aaen, and V. K. Devabhaktuni, “Advanced technologies for nextgeneration RF frontend modules,”Int. Journal of RF and Microw. ComputerAided Eng., March, 2019. [Wiley]
 L. T. Stant, M. J. Salter, N. M. Ridler, D. F. Williams, and P. H. Aaen, “Propagating measurement uncertainty to microwave amplifier nonlinear behavioural models,” IEEE Transactions on Microwave Theory and Techniques, vol. 67, no. 2, pp. 815821, Feb. 2019. [IEEE Xplore]
 B. Mirkhaydarov, H. Votsi, A. Sahu, et al., “Solution processed InAs nanowire microwave and mmwave switches,”Advanced Electronic Materials, p. 1800323, Oct. 2019. [Wiley]
 J. Urbonas, K. Kim, and P. H. Aaen, “Direct Efield measurement and imaging of oscillations within power amplifiers,” IEEE Transactions on Instrumentation and Measurement, Sept. 2018, Early Access. [IEEE Xplore]
 J. Urbonas, K. Kim, F. Vanaverbeke, and P. H. Aaen, “An electrooptic pulsed NVNA loadpull system for distributed Efield measurements,” IEEE Transactions on Microwave Theory and Techniques, vol. 66, no. 6, pp. 28962903, June 2018. [IEEE Xplore]
 H. Votsi, C. Li, P. H. Aaen, and N. M. Ridler, “An active interferometric method for extreme impedance onwafer device measurements,” IEEE Microw and Wireless Comp. Lett., vol. 27, no. 11, pp. 1034–1036, Nov. 2017.
 A. Sahu, P. H. Aaen, A. Lewandowski, et al., “Robust microwave characterization of inkjetprinted coplanar waveguides on flexible substrates,” IEEE Trans. Instrum. Meas., vol. 66, no. 12, pp. 3271–3279, Dec. 2017.
 L. Stant, P. Aaen, and N. Ridler, “Evaluating residual errors in waveguide VNAs from microwave to submillimetrewave frequencies,” IET Microwaves, Antennas Propagation, vol. 11, no. 3, pp. 324–329, 2017.
 L. T. Stant, P. H. Aaen, and N. M. Ridler, “Comparing methods for evaluating measurement uncertainty given in the JCGM evaluation of measurement data documents,” Measurement, vol. 94, pp. 847–851, 2016.
 A. Sahu, V. K. Devabhaktuni, R. K. Rabindra, and P. H. Aaen, “Recent advances in theory and applications of substrateintegrated waveguides: A review,” Int. Journal of RF and Microw. ComputerAided Eng., vol. 26, no. 2, pp. 129–145, 2016.
 K. A. Alshamaileh, M. J. Almalkawi, R. R. Junuthula, V. K. Devabhaktuni, and P. H. Aaen, “ANNbased modeling of compact impedancevarying transmission lines with applications to ultrawideband wilkinson power dividers,” Int. Journal of RF and Microw. ComputerAided Eng., vol. 25, no. 7, pp. 563–572, 201
 P. H. Aaen, J. Wood, D. Bridges, et al., “Multiphysics modeling of RF and microwave highpower transistors,” IEEE Trans. Microw. Theory Techn., vol. 60, no. 12, pp. 4013–4023, 2012.
 J. P. Everett, M. J. Kearney, H. Rueda, et al., “A quasitwodimensional model for highpower RF LDMOS transistors,”IEEE Trans. Electron Devices, vol. 58, no. 9, pp. 3081–3088, Sep. 2011.
 L. Zhang, P. H. Aaen, and J. Wood, “Portable space mapping for efficient statistical modeling of passive components,”IEEE Trans. Microw. Theory Techn., vol. 60, no. 3, pp. 441–450, Jan. 2012.
 H. Kabir, L. Zhang, M. Yu, P. Aaen, J. Wood, and Q.J. Zhang, “Smart modeling of microwave devices,” Microwave Magazine, IEEE, vol. 11, no. 3, pp. 105–118, May 2010.
 A. Sheikh, C. Roff, J. Benedikt, et al., “Peak class F and inverse class F drain efficiencies using Si LDMOS in a limited bandwidth design,” Microwave and Wireless Components Letters, IEEE, vol. 19, no. 7, pp. 473–475, Jul. 2009.
 J. Wood, P. H. Aaen, D. Bridges, et al., “A nonlinear electrothermal scalable model for highpower RF LDMOS transistors,” IEEE Trans. Microw. Theory Techn., vol. 57, no. 2, pp. 282–292, Feb. 2009.
 J. Wood, M. LeFevre, D. Runton, J.C. Nanan, B. H. Noori, and P. H. Aaen, “Envelopedomain time series (ET) behavioral model of a Doherty RF power amplifier for system design,” IEEE Trans. Microw. Theory Techn., vol. 61, no. 7, pp. 3067–3074, Jul. 2006.
 P. H. Aaen, J. A. Plá, and C. A. Balanis, “Modeling techniques suitable for CAD based design of internal matching networks of highpower RF/microwave transistors,” IEEE Trans. Microw. Theory Techn., vol. 60, no. 6, pp. 3067–3074, Jun. 2006
 P. H. Aaen, J. A. Plá, and C. A. Balanis, “On the development of CAD techniques suitable for the design of highpower RF transistors,” IEEE Trans. Microw. Theory Techn., vol. 53, no. 10, pp. 3067–3074, Oct. 2005.
 T. Liang, J. A. Plá, P. H. Aaen, and M. Mahalingam, “Equivalentcircuit modeling and verification of metalceramic packages for RF and microwave power transistors,” IEEE Trans. Microw. Theory Techn., vol. 47, no. 6, pp. 709–712, Jun. 1999.
Conferences

C. M. Preddy, R. Singh, H. Votsi, P. H. Aaen, and R. P. Silva, “Characterization of Carbon Fiber Reinforced Plastic for Microwave Circuit Design”, IEEE MTTS International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWSAMP 2019), Bochum, Germany, July 2019.
 H. Votsi, J. Urbonas and P. H. Aaen, “Experimental Verification and Imaging of Radiation Due to CoaxialtoMicrostrip Transitions,” 2019 93rd ARFTG Microwave Measurement Conference (ARFTG), Boston, MA, USA, June 2019.
 J. Urbonas, C. Matei, and P. H. Aaen, “Transient and steadystate thermal measurements of GaNonSiC HEMT transistors under realistic microwave drive,” in 2019 92nd ARFTG Microwave Measurement Conference (ARFTG), Jan. 2019, accepted for publication.
* Awarded Best Student Paper
 S. Gillespie, D. Root, M. Marcu, and P. H. Aaen, “Electrothermal XParameters for dynamic modeling of RF and microwave power transistors,” in Proceedings of the 21st European Microwave Week (EuMW 2018), Sep. 2018.
 J. Urbonas, F. Vanaverkeke, K. Kim, and P. H. Aaen, “Electrooptic near field imaging of highpower RF/microwave transistors in plastic packages,” in 2018 91st ARFTG Microwave Measurement Conference (ARFTG), Jun. 2018. * Awarded Best Conference Paper.
 H. Votsi, P. H. Aaen, S. Gillespie, B. Mirkhaydarov, M. Shkunov, and P. Young, “Modeling of solution processed indium arsenide nanowire microwave switches,” in IEEE MTTS Int. Microwave Symp. Dig., Philadelphia, Jun. 2018.
 L. Zhang, P. H. Aaen, K. Kim, and H. Rueda, “Nonquasistatic largesignal model for RF LDMOS power transistors,” in IEEE MTTS Int. Microwave Symp. Dig., Philadelphia, Jun. 2018.
 M. B. Steer, T. G. Williamson, J. Wetherington, J. Wilkerson, P. Aaen, and A. G. Schuchinsky, “Power and temperature dependence of passive intermodulation distortion,” in 2018 22nd International Microwave and Radar Conference (MIKON), May 2018, pp. 428–431.
 T. Goss and P. H. Aaen, “Behavioural modelling for adaptive array systems incorporating highpower amplifier nonlinearities,” in Proceedings of the 12th European Conference on Antennas and Propagation (EUCAP), Apr. 2018, pp. 662–665.
 A. Sahu, V. Devabhaktuni, A. Lewandowski, T. M. Wallis, and P. H. Aaen, “CADassisted microwave characterization of inkjet printed CPW on PET substrates,” in 2016 88th ARFTG Microwave Measurement Conference (ARFTG), Dec. 2016, pp. 1–3. * Awarded Best Student Paper
 O. Hussein, K. A. Shamaileh, V. Devabhaktuni, and P. Aaen, “Wideband impedancevarying nway Wilkinson power divider/combiner for RF power amplifiers,” in 2016 88th ARFTG Microwave Measurement Conference (ARFTG), Dec. 2016, pp. 1–4.
 H. Votsi, I. RochJeune, K. Haddadi, et al., “Development of a reference wafer for onwafer testing of extreme impedance devices,” in 2016 88th ARFTG Microwave Measurement Conference (ARFTG), Dec. 2016, pp. 1–4.
 L. T. Stant, P. H. Aaen, and N. M. Ridler, “Evaluating residual errors in waveguide network analysers from microwave to submillimetrewave frequencies,” in IET Colloquium on MillimetreWave and Terahertz Engineering Technology 2016, Mar. 2016, pp. 1–2.
 A. Sahu, V. Devabhaktuni, A. Lewandowski, et al., “Microwave characterization of inkjet printed CPW on PET substrates,” in Microwave Measurement Conference, 2015 86th ARFTG, Dec. 2015, pp. 1–4.
 A. Sahu, V. Devabhaktuni, and P. H. Aaen, “A slot anntenna designed in ridge gap waveguide technology for vband applications,” in 2015 IEEE MTTS International Microwave and RF Conference (IMaRC), Dec. 2015, pp. 385–387.
 P. H. Aaen and S. Gillespie, “Distributed multiphysics modeling of microwave power transistors,” in 2015 IEEE MTTS International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO), Aug. 2015, pp. 1–3.
 Q. Zhang, L. Zhang, and P. Aaen, “Statistical modeling of RF/microwave FET devices,” in Radio Science Meeting (Joint with APS Symposium), 2014 USNCURSI, Jul. 2014, pp. 265–265.
 A. Sahu, B. Grayczyk, M. Almalkawi, V. Devabhaktuni, and P. Aaen, “HighQ spiral inductors with multilayered splitring resonator (SRR) patterned ground shields,” in 2014 IEEE Antennas and Propagation Society International Symposium (APSURSI), Jul. 2014, pp. 346–347.
 T. Barbieri, P. H. Aaen, and B. Noori, “Removeal of measurement artifacts present in highpower RF transistor loadpull testfixtures,” in 81st Automatic RF Techniques Group Conference Digest Spring 2013, Seattle, WA, Jun. 2013.
 P. H. Aaen, J. Wood, D. Bridges, et al., “Multiphysics modeling of highpower microwave transistors,” in IEEE MTTS Int. Microwave Symp. Dig., Montreal, Canada, Jun. 2012, pp. 1–3.
 J. P. Everett, M. J. Kearney, C. M. Snowden, et al., “Multiphysics modeling of highpower microwave transistors,” inIEEE MTTS Int. Microwave Symp. Dig., Montreal, Canada, Jun. 2012, pp. 1–3.
 E. M. Johnson, P. H. Aaen, D. Bridges, and J. Wood, “The effects of material interfaces on thermal resistance values for highpower microwave transistors,” in 79th Automatic RF Techniques Group Conference Digest Spring 2012, Montreal, Canada, Jun. 2012, pp. 125–129.
 L. Mareddy, M. Almalkawi, V. Devabhaktuni, S. Vemuru, L. Zhang, and P. H. Aaen, “Gradient based reverse ANN modeling approach for RF/microwave computer aided design,” in European Microwave Integrated Circuits Conference (EuMIC), Oct. 2012.
 N. Dehghan, A. Porch, S. C. Cripps, and P. H. Aaen, “A novel high resolution EField microscope system with applications in HPA diagnostics,” in 78th Automatic RF Techniques Group Conference Digest, Tempe, AZ, Dec. 2011.
 J. P. Everett, M. J. Kearney, E. M. Johnson, P. H. Aaen, J. Wood, and C. M. Snowden, “Optimization of LDMOS power transistors for high power microwave amplifiers using highly efficient physicsbased model,” in European Microwave Integrated Circuits Conference (EuMIC), Oct. 2011, pp. 41–44.
 J. Everett, M. Kearney, H. Rueda, et al., “Fast physical models for Si LDMOS power transistor characterization,” inMicrowave Symposium Digest (MTT), 2011 IEEE MTTS International, Jun. 2011, pp. 1–4.
 P. H. Aaen and L. Zhang, “A computationally efficient surrogate modeling methodology applied to transmission lines,” in The 28th International Reivew of Progress in Applied Computational Electromagnetics, Columbus, OH, Apr. 2012, pp. 696–701.
 P. H. Aaen, L. Zhang, D. Lamey, J. Wood, and S. Arvas, “Visualizing timedomain spatially distributed electromagnetic fields using Sonnet,” in The 28th International Reivew of Progress in Applied Computational Electromagnetics, Columbus, OH, Apr. 2012, pp. 674–679.
 J. Wood and P. Aaen, “On the modeling of LDMOS RF power transistors,” in Custom Integrated Circuits Conference (CICC), 2010 IEEE, Sep. 2010, pp. 1–8.
 P. Aaen, J. Wood, Q. Li, and E. Mares, “Thermal resistance modeling for the electrothermal layout of highpower RF transistors,” in Microwave Symposium Digest (MTT), 2010 IEEE MTTS International, May 2010, pp. 1672–1675.
 F. Mkadem, M. Ayed, S. Boumaiza, J. Wood, and P. Aaen, “Behavioral modeling and digital predistortion of power amplifiers with memory using two hidden layers artificial neural networks,” in Microwave Symposium Digest (MTT), 2010 IEEE MTTS International, May 2010, pp. 656–659.
 A. Sheikh, R. Roff, J. Benedikt, et al., “Systematic waveform engineering enabling high efficiency modes of operation in Si LDMOS at both Lband and Sband frequencies,” in IEEE MTTS Int. Microwave Symp. Dig., Atlanta, GA, Jun. 2008, pp. 1143–1146.
 J. Wood, D. Lamey, D. C. M. Guyonnet, D. Bridges, N. Monsauret, and P. H. Aaen, “An extrinsic component parameter extraction method for high power RF LDMOS transistors,” in IEEE MTTS Int. Microwave Symp. Dig., Atlanta, GA, Jun. 2008, pp. 607–610.
 D. Bridges, J. Wood, M. Guyonnet, and P. H. Aaen, “A nonlinear electrothermal model for high power RF LDMOS transistors,” in IEEE MTTS Int. Microwave Symp. Dig., Atlanta, GA, Jun. 2008, pp. 475–478.
 J. Wood, P. H. Aaen, and J. A. Plá, “Characterization and modeling of LDMOS power FETs for RF power amplifier applications,” in SiRF Conference Digest, Orlando, Florida, Jan. 2008, pp. 134–138.
 B. Noori, P. Hart, J. Wood, et al., “Loadpull measurements using modulated signals,” in EuMC Conference Digest, Manchester, Germany, Sep. 2006, pp. 1594–1597.
 P. Hart, J. Wood, B. Noori, and P. H. Aaen, “Improving loadpull measurement time by intelligent measurement interpolation and surface modeling techniques,” in Automatic RF Techniques Group Conference Digest Summer 2006, San Fransisco, CA, Jun. 2006, pp. 69–72.
 P. Aaen, J. A. Plá, and C. A. Balanis, “Increased feedback due to package mounting,” in 13th Topical Meeting on Electrical Performance of Electronic Packaging, Portland, OR, Dec. 2004, pp. 49–52.
 P. Aaen, J. A. Plá, D. Bridges, and E. Shumate, “A wideband method for the rigorous lowimpedance loadpull measurement of highpower transistors suitable for largesignal model validation,” in Automatic RF Techniques Group Conference Digest Fall 2000, Boulder, CO, Dec. 2000, pp. 163–169.
 P. Aaen, J. Peng, and M. Mahalingam, “Characterization of packages for RF power LDMOS devices,” in URSI, Toronto, ON Canada, Jun. 1998, pp. 163–169.