Selected Reprints

2017

• Dylan S. Eustice, Casey Latham, Charles Baylis, Lawrence Cohen, and Robert J. Marks. "Amplifier-in-the-Loop Adaptive Radar Waveform Synthesis.'' IEEE Transactions on Aerospace and Electronic Systems (2017) Pages: 826 - 836 . DOI: 10.1109/TAES.2017.2665158
• Matthew Fellows, Lucilia Lamers, Charles Baylis, Lawrence Cohen, Robert J. Marks, "A fast load-pull optimization for power-added efficiency under output power and ACPR constraints,'' IEEE Transactions on Aerospace and Electronic Systems, 2016, v.52, #6, pp.2906 - 2916. DOI: 10.1109/TAES.2016.150313.
• Charles Baylis, Lawrence Cohen, Dylan Eustice, Robert Marks. "Myths concerning Woodward's ambiguity function: analysis and resolution,'' IEEE Transactions on Aerospace and Electronic Systems, 2016, v.52, #6, pp. 2886 - 2895. DOI: 10.1109/TAES.2016.15073
• Zachary Hays, Christopher Kappelmann, Sarvin Rezayat, Matthew Fellows, Lucilia Lamers, Matthew Flachsbart, Jennifer Barlow, Charles Baylis, Edward Viveiros, Ali Darwish, Abigail Hedden, John Penn and Robert J. Marks II "Real-time amplifier optimization algorithm for adaptive radio using a tunable-varactor matching network." Radio and Wireless Symposium (RWS), 2017 IEEE, pp. 215-217. DOI: 10.1109/RWS.2017.7885991 (html)
• Casey Latham, Matthew Fellows, Charles Baylis, Lawrence Cohen, and Robert J. Marks. "Radar waveform optimization for ambiguity function properties and dynamic spectral mask requirements based on communication receiver location." Radio and Wireless Symposium (RWS), 2017 IEEE, pp. 147-149. DOI: 10.1109/RWS.2017.7885971 (html)
• Sarvin Rezayat, Charles Baylis, Robert J. Marks, and Ed Viveiros. "Measurement of load-pull performance in the power smith tube using a tunable varactor matching network." IEEE Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS), Waco, TX. , March 30-31, 2017, pp. 1-4
• Zachary Hays, Charles Baylis, Robert J. Marks, Mohammad Abu Khater, Abbas Semnani, Dimitrios Peroulis, and Ed Viveiros. "Fast amplifier PAE optimization using resonant frequency interval halving with an evanescent-mode cavity tuner." IEEE Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS), Waco, TX. , March 30-31, 2017, pp. 1-3.
• Lucilia Lamers, Eric Walden, Charles Baylis, Ed Viveiros and Robert J. Marks. ``Fast design of unconditionally stable power amplifier using the center frequency smith tube." IEEE Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS), Waco, TX. March 30-31, 2017, pp. 1-4.
• Jacob Boline, Matthew Fellows, Alicia Magee, Charles Baylis, Lawrence Cohen, and Robert J. Marks. "Fast reconfiguration in real-time transmitter amplifier impedance optimization using S-parameters." IEEE Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS), Waco, TX, March 30-31, 2017, pp. 1-4.
• Albert R. Yu, Charles Baylis, and Robert J. Marks. "Ambiguity function magnitude inversion via a modified Gerchberg-Saxton algorithm." IEEE Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS), Waco, TX, March 30-31, 2017, pp. 1-4.
• Matthew W. Fellows, Sarvin Rezayat, Alicia Magee, Charles Baylis, Lawrence Cohen, Robert J. Marks II, “OPTIMIZATION OF LOAD IMPEDANCE AND BIAS VOLTAGE FOR POWER-ADDED EFFICIENCY, DELIVERED POWER, AND ADJACENTCHANNEL POWER RATIO USING THE BIAS SMITH TUBE.” USNC-URSI National Radio Science Meeting, January 2017, Boulder, Colorado.
• Zachary Hays, Lucilia Lamers, Charles Baylis, Robert Marks II, Ed Viveiros, Ali Darwish, John Penn, Abigail Hedden. “COMPARISON OF GAIN OPTIMIZATION TECHNIQUES ON RECONFIGURABLE POWER AMPLIFIERS WITH A REALTIME VARACTOR TUNING NETWORK.” USNC-URSI National Radio Science Meeting, January 2017, Boulder, Colorado.
• Charles Baylis, Robert J. Marks II, Liang Dong, Andrew Clegg, Lawrence Cohen. “DYNAMIC SPECTRUM COLLABORATION BETWEEN RADAR AND WIRELESS COMMUNICATION: A PROPOSED FRAMEWORK FOR THE SIMULTANEOUS OPTIMIZATION OF POLICY, NETWORKS, AND CIRCUITS.” USNC-URSI National Radio Science Meeting, January 2017, Boulder, Colorado.
• Casey Latham, Alicia Magee, Jacob Boline, Alexander Tsatsoulas, Matthew Fellows, Charles Baylis, Lawrence Cohen, Robert J. Marks II. “DUAL-LOOP JOINT CIRCUIT ANDWAVEFORM OPTIMIZATION TECHNIQUE FOR AMBIGUITY FUNCTION, SPECTRAL PERFORMANCE, AND POWER EFFICIENCY.” USNC-URSI National Radio Science Meeting, January 2017, Boulder, Colorado.

2016

• Dylan Eustice, Charles Baylis, Lawrence Cohen, and Robert J. Marks II. "Waveform synthesis via alternating projections with ambiguity function, peak-to-average power ratio, and spectrum requirements." 2016 IEEE Radio and Wireless Symposium (RWS), pp. 190-192. IEEE, 2016.
• Joseph Barkate, Alexander Tsatsoulas, Matthew Fellows, Matthew Flachsbart, Charles Baylis, Lawrence Cohen, and Robert J. Marks II. "Fast, momentum-aided optimization of transmitter amplifier load impedance and input power for cognitive radio using the power smith tube."2016 IEEE Radio and Wireless Symposium (RWS), pp. 54-56. IEEE, 2016
• Matthew Fellows, Sarvin Rezayat, Jennifer Barlow, Joseph Barkate, Alexander Tsatsoulas, Charles Baylis, Lawrence Cohen, and Robert J. Marks II. "The bias smith tube: Simultaneous optimization of bias voltage and load impedance in power amplifier design." 2016 IEEE Radio and Wireless Symposium (RWS), pp. 215-218. IEEE, 2016
• Charles Baylis, Matthew Fellows, Joseph Barkate, Alexander Tsatsoulas, Sarvin Rezayat, Lucilia Lamers, Robert J. Marks II, and Lawrence Cohen. "Circuit optimization algorithms for real-time spectrum sharing between radar and communications." IEEE Radar Conference (RadarConf), pp. 1-4, 2016. DOI: 10.1109/RADAR.2016.7485065 (html)
• Joseph Barkate, Matthew Flachsbart, Zachary Hays, Matthew Fellows, Jennifer Barlow, Charles Baylis, Lawrence Cohen, and Robert J. Marks II "Fast, simultaneous optimization of power amplifier input power and load impedance for power-added efficiency and adjacent-channel power ratio using the power smith tube," IEEE Transactions on Aerospace and Electronic Systems 52, no. 2 (2016) pp.928-937. DOI: 110.1109/TAES.2015.150335 (html)
• Alexander Tsatsoulas, Joseph Barkate, Charles Baylis, and Robert J. Marks. "A simplex optimization technique for real-time, reconfigurable transmitter power amplifiers." 2016 IEEE MTT-S International Microwave Symposium (IMS), San Francisco, California, 22-27 May 2016, pp. 1-4. IEEE, 2016. DOI: 10.1109/MWSYM.2016.7540376 (html)
• Casey Latham, Charles Baylis, Lawrence Cohen, Robert J. Marks. "Dynamic spectral mask construction for radar transmission based on communication receiver locations." 2016 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS) March 31-April 1, 2016, Waco, TX.
  

2015

• Matthew Fellows, Charles Baylis, Lawrence Cohen, Robert J. Marks II. "Real-time load impedance optimization for radar spectral mask compliance and power efficiency." IEEE Transactions on Aerospace and Electronic Systems, Volume 51, no. 1 (2015) pp.591-599.
  DOI:  10.1109/TAES.2014.130825
• Joseph Barkate, Matthew Fellows, Jennifer Barlow, Charles Baylis, and Robert J. Marks. "The Power Smith Tube: Joint optimization of power amplifier input power and load impedance for power-added efficiency and adjacent-channel power ratio." In Wireless and Microwave Technology Conference (WAMICON), 2015 IEEE 16th Annual, pp. 1-4. IEEE, 2015.
• Matthew Fellows, Jennifer Barlow, Matthew Flachsbart, Joseph Barkate,Charles Baylis, Lawrence Cohen & Robert J Marks. "Fast radar power amplifier optimization for bandwidth, efficiency, and spectral confinement using the Smith Tube," IEEE International Radar Conference (RadarCon 2015), Arlington, VA, May 11-15, 2015, pp. 139 - 144, DOI: 10.1109/RADAR.2015.7130985
• Dylan Eustice, Charles Baylis, Lawrence Cohen, Robert J Marks, "Effects of power amplifier nonlinearities on the radar ambiguity function," IEEE International Radar Conference (RadarCon 2015), Arlington, VA, May 11-15, 2015, pp. 1725 - 1729 DOI: 10.1109/RADAR.2015.7131277
• Matthew Fellows, Jennifer Barlow, Charles Baylis, Joseph Barkate, Robert J. Marks II. "Designing power amplifiers for spectral compliance using spectral mask load-pull measurements." IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR), San Diego, Jan 25-28, 2015, pp.1-3. DOI: 10.1109/PAWR.2015.7139199
• Matthew Fellows, Matthew Flachsbart, Jennifer Barlow, Joseph Barkate, Charles Baylis, Lawrence Cohen, Robert J. Marks II. "Optimization of power-amplifier load impedance and waveform bandwidth for real-time reconfigurable radar." IEEE Transactions on Aerospace and Electronic Systems, 51, no. 3 (2015)
• Joseph Barkate, Matthew Fellows, Jennifer Barlow, Charles Baylis, and Robert J. Marks II. “The Power Smith Tube: Joint optimization of power amplifier input power and load impedance for power-added efficiency and adjacent-channel power ratio.” Wireless and Microwave Technology Conference (WAMICON), 2015 IEEE 16th Annual, pp. 1-4. IEEE, 2015.
• Matthew Fellows, Jennifer Barlow, Matthew Flachsbart, Joseph Barkate, Charles Baylis, Larry Cohen, Robert Marks II. “Fast Radar Power Amplifier Optimization for Bandwidth, Efficiency, and Spectral Confinement Using the Smith Tube,” 2015 IEEE International Radar Conference (RadarCon), May 11-15, Arlington Va.
• Dylan Eustice, Charles Baylis and Robert J. Marks II, “Woodwards Ambiguity Function: From Foundations to Applications,” 2015 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS), April 23-24, 2015. Waco, Texas (pp. 1-17).
• Dylan Eustice, Charles Baylis, Casey Latham, Robert J. Marks II, and Lawrence Cohen “Optimizing RadarWaveforms Using Generalized Alternating Projections,” 2015 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS), April 23-24,2015. Waco, Texas (pp. 1-6)
• Charles Baylis, Robert J. Marks, and Lawrence Cohen "Pareto optimization of radar receiver low-noise amplifier source impedance for low noise and high gain" International Journal of Microwave and Wireless Technologies, (Cambridge University Press and the European Microwave Association) November 2015 (pp. 1-7)
  

         2014

• Charles Baylis, Joshua Martin, Matthew Moldovan, Robert J. Marks II, Lawrence Cohen, Jean de Graaf, Robert Johnk and Frank Sanders, "Spectrum Analysis Considerations for Radar Chirp Waveform Spectral Compliance Measurements," IEEE Transactions on Electromagnetic Compatibility, Volume 56 , #3, June 2014, pp.520--529 [html]
  DOI: 10.1109/TEMC.2013.2291540
• Charles Baylis, Matthew Fellows, Lawrence Cohen, and Robert J. Marks II,   "Solving the Spectrum Crisis: Intelligent, Reconfigurable Microwave Transmitter Amplifiers for Cognitive Radar,'' IEEE Microwave Magazine, Volume: 15, Issue:5, July-Aug. 2014, pp. 94 - 107.
• Matthew Fellows, Matthew Flachsbart, Jennifer Barlow, Charles Baylis, and Robert J. Marks II. "The Smith tube: Selection of radar chirp waveform bandwidth and power amplifier load impedance using multiple-bandwidth load-pull measurements,"  IEEE 15th Annual Wireless and Microwave Technology Conference (WAMICON), pp. 1-5. IEEE, 2014. 
  DOI: 10.1109/WAMICON.2014.6857780
• Matthew Fellows, Jennifer Barlow, Joseph Barkate, Matthew Mosley, Matthew Flachsbart, Charles Baylis, Lawrence Cohen, and Robert J. Marks II, "Measurement-Based Radar Waveform Optimization Using the Ambiguity Function and Spectral Mask," 2014 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS), April 3-4, 2014, Waco, Texas pp.1-4.
  DOI: 10.1109/WMCaS.2014.7015886
• Zachary Hays, Grant Richter, Stephen Berger, Charles Baylis, Robert J. Marks II, "Alleviating airport WiFi congestion: A comparison of 2.4 GHz and 5 GHz WiFi usage and capabilities," 2014 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS), April 3-4, 2014, Waco, Texas pp.1-4.
  DOI: 10.1109/WMCaS.2014.7015885
• Charles Baylis, Matthew Fellows, Matthew Flachsbart, Jennifer Barlow, Joseph Barkate, and Robert J. Marks II "Enabling the Internet of Things: Reconfigurable power amplifier techniques using intelligent algorithms and the Smith tube.''  Circuits and Systems Conference (DCAS), 2014 IEEE Dallas, pp. 1-4. IEEE, 2014.

2013

• Matthew Fellows, Charles Baylis, Lawrence Cohen, and Robert J. Marks II, "Radar Waveform Optimization Design to Minimize Spectral Spreading and Optimize Target Detection," 2013 Texas Symposium on Wireless & Microwave Circuits & Systems, Waco, Texas, April 4-5, 2013 (4 pgs) DOI: 10.1109/WMCaS.2013.6563564
• Charles Baylis, Josh Martin, Matthew Fellows, David Moon, Matt Moldovan, Lawrence Cohen, Robert J. Marks II, "Radar power amplifier circuit and waveform optimization for spectrally confined, reconfigurable radar systems,'' 2013 IEEE Radar Conference (RADAR), Ottawa, ON, Canada, April 29-May 3 2013, pp. 1-4. DOI: 10.1109/RADAR.2013.6586037.
• Matthew Fellows, Charles Baylis, Lawrence Cohen, and Robert J. Marks II. "Calculation of the Radar Ambiguity Function from Time-Domain Measurement Data for Real-Time, Amplifier-in-the-Loop Waveform Optimization." 2013 82nd ARFTG Microwave Measurement Conference, Ohio State University, Columbus, Ohio pp. 1-5. IEEE. [html]

          2012

• J. Martin, C. Baylis, R.J. Marks II, L. Cohen, and J. de Graaf, “A Peak-Search Algorithm for Combined PAE and ACPR Load-Pull,” Power Amplifier Symposium, La Jolla, California, September 2012 (ppt)
• Charles Baylis, Josh Martin, Matthew Moldovan, Obiageli Akinbule, Robert J. Marks II, "A Test Platform for Real-Time Waveform and Impedance Optimization in Microwave Radar Systems," 2012 International Diversity & Design Conference, Kauai, Hawaii, 22-27 January 2012, pp.1-4.
• Matthew Moldovan, Charles Baylis, Michael Wicks, Josh Martin, Robert J. Marks II, "Chirp Optimization Using Piecewise Linear Approach," 2012 International Diversity & Design Conference, Kauai, Hawaii, 22-27 January 2012, pp.1-4.
• Josh Martin, Charles Baylis and Robert J. Marks II, and Matthew Moldovan, "Perturbation Size and Harmonic Limitations in Affine Approximation for Time Invariant Periodicity Preservation Systems," 2012 International Diversity & Design Conference, Kauai, Hawaii, 22-27 January 2012, pp.1-5.
  
• Josh Martin, Matthew Moldovan, Charles Baylis, Robert J.Marks II, Lawrence Cohen, Jean de Graaf, "Radar chirp waveform selection and circuit optimization using ACPR load-pull measurement," 2012 IEEE 13th Annual Wireless and Microwave Technology Conference (WAMICON), pp.1-4, 15-17 April 2012.
  doi: 10.1109/WAMICON.2012.6208465
• Charles Baylis II and Robert J. Marks II, "Small Perturbation Harmonic Coupling In Nonlinear Periodicity Preservation Systems," IEEE Transactions on Circuits and Systems I: Regular Papers, vol.59, no.12, pp.3034-3045, Dec. 2012
  
• Charles Baylis II and Robert J. Marks II, "Evaluation of Harmonic Coupling Weights in Nonlinear Periodicity Preservation Systems," IEEE Transactions on Circuits and Systems I: Regular Papers, vol.59, no.12, pp.3024-3033, Dec. 2012

2011

• Charles Baylis, Lawrence Dunleavy, Steven Lardizabal, Robert J. Marks II, and Alberto Rodriguez, "Efficient Optimization Using Experimental Queries: A Peak-Search Algorithm for Efficient Load-Pull Measurements," Journal of Advanced Computational Intelligence and Intelligent Informatics, Vol.15, No.1 pp. 13-20, 2011
• Charles Baylis, Robert J. Marks II, Josh Martin, Hunter Miller, and Matthew Moldovan. "Going Nonlinear," IEEE Microwave Magazine, April 2011, pp.55-64
• Charles Baylis, Joseph Perry, Matthew Moldovan, Robert J. Marks II, and Lawrence Dunleavy, "Use of a Step-Response Approximation for Thermal Transient Modeling in Power MOSFETs,'' 74th ARFTG (Automatic RF Techniques Group) Microwave Measurement Symposium, December 1st - 4th, Broomfield/Boulder, Colorado, 2009, pp.1-4,
• Charles Baylis, Robert J. Marks, "Frequency multiplexing tickle tones to determine harmonic coupling weights in nonlinear systems,'' Microwave Measurement Symposium (ARFTG), 2011 78th ARFTG pp.1-7, 1-2 Dec. 2011. doi: 10.1109/ARFTG78.2011.6183868

        2009

• Charles Baylis, Joseph Perry, Matthew Moldovan, Robert J. Marks II, and Lawrence Dunleavy, "Use of a Step-Response Approximation for Thermal Transient Modeling in Power MOSFETs,'' 74th ARFTG (Automatic RF Techniques Group) Microwave Measurement Symposium, December 1st - 4th, Broomfield/Boulder, Colorado, 2009, pp.1-4,