193

P.J. Hansen, V. Vaithyanathan, Y. Wu, S. Heikman, S.P. DenBaars, R.A. York, U.K. Mishra, D.G. Schlom,  and J.S. Speck, “Rutile films grown by Molecular beam epitaxy on GaN and AlGaN/GaN”,  J. Vacuum Science and Technology B 23(2), Mar/Apr 2005, pp. 499-506

Journal Paper

192

2005

J. Park, J. Lu, S. Stemmer, and R. A. York, “Microwave dielectric properties of tunable capacitors employing bismuth zinc Niobate thin films”,  J.  Applied Physics, vol. 97, 084110 (2005)

Journal Paper

191

2005

C. Sanabria, H. Xu, T. Palacios, A. Chakraborty, S. Heikman, U. K. Mishra, and R.A. York, “Influence of epitaxial structure in the noise figure of AlGaN/GaN HEMTs,” IEEE Trans. Microwave Theory and Tech., vol. 53 Feb 2005, pp. 762-769

Journal Paper

190

2005

P.J. Hansen, Y. Terao, Y. Wu, R.A. York, U.K. Mishra, and J.S. Speck, “LiNbO₃ thin film growth on (0001)-GaN”,  J. Vacuum Science and Technology B 23(1), Jan/Feb 2005, pp. 162-167

Journal Paper

189

2005

T. O'Sullivan, R.A. York, B. Noren, P.M. Asbeck, “Adaptive duplexer implemented using single-path and multipath feedforward techniques with BST phase shifters”,  IEEE Trans. Microwave Theory and Tech., vol. 53, Jan 2005, pp. 106-114

Journal Paper

184

2005

H. Xu, N.K. Pervez, J. Park, C.Sanabria, and R.A. York, “Tunable Microwave Integrated Circuits Using BST Thin Film Capacitors With Device Structure Optimization”, presented at Int. Symposium on Integrated Ferroelectrics (ISIF 2005), Shanghai China, April 2005

Conference Paper

183

2005

N. K. Pervez, J. Park, J. Lu, S. Stemmer, and R. A. York, “High Frequency Loss Modeling Using Universal Relaxation”, presented at Int. Symposium on Integrated Ferroelectrics (ISIF 2005), Shanghai China, April 2005

Conference Paper

182

2005

N. Pervez, J. Park, J. Lu, S. Stemmer, and R. A. York, “Geometrical Scaling Effects In High Permittivity Capacitors”, presented at Int. Symposium on Integrated Ferroelectrics (ISIF 2005), Shanghai China, April 2005

Conference Paper

181

2005

J. Park, J. Lu, S. Stemmer, and R. A. York, “BZN Thin Film Capacitors For Microwave Low Loss Tunable Applications” presented at Int. Symposium on Integrated Ferroelectrics (ISIF 2005), Shanghai China, April 2005

Conference Paper

180

2005

J. Park, J. Lu, S. Stemmer, and R.A. York, “Microwave planar capacitors employing low-loss, high-K, and tunable BZN thin films”,  presented at IEEE International Microwave Symposium IMS2005, Long Beach, CA June 2005

Conference Paper

179

2005

H. Xu, C. Sanabria, S. Heikman, S. Keller, U.K. Mishra, R.A. York, “High power GaN oscillators using field-plated HEMT Structure”,  presented at IEEE International Microwave Symposium IMS2005, Long Beach, CA June 2005

Conference Paper

188

2004

N.K. Pervez, P.J. Hansen, and R.A. York, “High tunability barium strontium Titanate thin films for RF circuit applications,” Applied Physics Letters, vol. 85, no. 19, 8 Nov 2004, pp. 4451-4453.

Journal Paper

187

2004

D. Tenne, A. Soukiassian, X.X. Xi, T.R. Taylor, P.J. Hansen, J.S. Speck, R.A. York,  “Effect of thermal strain on the ferroelectric phase transition in polycrystalline Ba_0.5Sr_0.5TiO₃ thin films studied by Raman spectroscopy” Applied Physics Letters, vol. 85, no. 18, 1 Nov 2004, pp. 4124-4126.

Journal Paper

186

2004

P.J. Hansen, L. Shen, Y. Wu, A. Stonas, Y. Terao, S. Heikman, D. Buttari, T.R. Taylor, S.P. DenBaars, U.K. Mishra, R.A. York, and J.S. Speck, "AlGaN/GaN Metal-oxide-semiconductor Heterostructure Field Effect Transistors using Barium Strontium Titanate”,  J. Vacuum Science and Technology B 22(5), Sept/Oct 2004, pp. 2479-2485

Journal Paper

185

2004

H. Xu, C. Sanabria, A. Chini, S. Keller, U. K. Mishra, and R.A. York, “A C-band High Dynamic Range GaN HEMT Low Noise Amplifier,” IEEE Microwave and Wireless Components Letters, vol. 14, June 2004, pp. 262-264

Journal Paper

178

2004

N. Pervez, J. Lu, S. Stemmer, and R. A. York, “AC Loss Modeling in Ba_0.5Sr_0.5TiO₃ Using Dielectric Relaxation”, Material Research Society Symposium Proceedings 833 G1.10.1 (2005). 2004 MRS Fall Meeting, Boston, December 2004. (Best paper award)

Conference Paper

177

2004

J. Park, J. Lu, S. Stemmer , and R.A. York, “Low-loss, tunable microwave capacitors using bismuth zinc niobate thin films”, 2004 IEEE International Ultrasonics, Ferroelectrics, and Frequency Control 50th Anniversary Joint Conference, Montreal, August, 2004, pp. 17-20.

Conference Paper

176

2004

N. K. Pervez, P. J. Hansen, and R. A. York, “Optimization of High Tunability Barium Strontium Titanate Thin Films Grown by RF Magnetron Sputtering”, 2004 IEEE International Ultrasonics, Ferroelectrics, and Frequency Control 50th Anniversary Joint Conference, Montreal, August, 2004, pp. 278-280.

Conference Paper

175

2004

C. Sanabria, H. Xu, T. Palacios, A. Chakraborty, S. Heikman, U.K. Mishra, R.A. York, “Influence of the heterostructure design on noise figure of AlGaN/GaN HEMTss”, 62^nd Device Research Conference (DRC) Digest, June, 2004, vol. 1, pp. 43-44

Conference Paper

174

2004

H. Xu, C. Sanabria, N.K. Pervez, S. Keller, U.K. Mishra, R.A. York, “Low Phase-Noise 5 GHz AlGaN/GaN HEMT Oscillator Integrated with Ba_xSr_1-xTiO₃ Thin Films”, IEEE International Microwave Symposium Digest IMS2004, Ft. Worth, TX, June 2004, vol. 3, pp. 1509-1512.

Conference Paper

173

2004

T. O’Sullivan, R. York, B. Noren, P. Asbeck, “Adaptive Duplexer Implemented Using Feedforward Technique With a BST Phase Shifter”, IEEE International Microwave Symposium Digest IMS2004, Ft. Worth, TX, June 2004, vol. 3, pp. 1299-1302.

Conference Paper

172

2004

L.-Y. Chen, R. Forse, D. Chase, and R.A. York, “Analog Tunable Matching Network Using Integrated Thin-Film BST Capacitors”, IEEE International Microwave Symposium Digest IMS2004, Ft. Worth, TX, June 2004, vol. 3, pp. 261-264.

Conference Paper

171

2004

H. Xu, N.K. Pervez, P. J. Hansen, L.Shen, S. Keller, J. S. Speck, U. Mishra, R. A. York, “Integration of Ba_xSr_1-xTiO₃ thin-films with AlGaN/GaN HEMT Circuits”, IEEE Electron Device Letters, vol. 25, Feb 2004, pp. 49-51

Journal Paper

170

2003

J. Serraiocco, P. J. Hansen, T. R. Taylor, J. S. Speck and R.A. York, “Compact Distributed Phase-Shifters at X-Band using BST”, J. Integrated Ferroelectrics, vol. 56/2003, pp. 1087-1095

Journal Paper

169

2003

N. Pervez, P. J. Hansen, T. R. Taylor, J. S. Speck and R.A. York, “Observation of Long Transients in the Electrical Characterization of Thin Film BST Capacitors”, J.  Integrated Ferroelectrics, vol. 53/2003, pp. 503-511

Journal Paper

168

2003

P. Jia, Lee-Yin Chen, A. Alexanian, R.A. York, “Broadband High Power Amplifier using Spatial Power Combining Technique,” IEEE Trans. Microwave Theory and Tech., vol. 51, no. 12, Dec 2003, pp. 2469-2475

Journal Paper

167

2003

J. J. Rosenberg, M.P. DeLisio, B.C. Deckman, C.-T. Cheung, D.B. Rutledge, and R.A. York, “The Grid Amplifier:  Enabling High-Power Millimeter-Wave Systems”, Microwave Journal, vol. 46, Dec. 2003, pp. 64-76.

Journal Paper

166

2003

H. Xu, N.K. Pervez, P. J. Hansen, C. Sanabria, L. Shen, S. Keller, U.K. Mishra, and R.A. York, “Integration of Ba_xSr_1-xTiO₃ Thin Films with AlGaN/GaN HEMT Circuits”, Proc. Of the  11th IEEE Int. Symposium on Electron Devices for Microwave and Optoelectronic Applications (EDMO'2003), November, 2003 pp. 273-278

Conference Paper

165

2003

P.J. Hansen, V. Vaithyanathan, Y. Wu, S. Heikman, S.P. DenBaars, R.A. York, U.K. Mishra, D.G. Scholm, and J.S. Speck, “AlGaN/GaN Metal Oxide Semiconductor Field Effect Transistors using Titanium Dioxide,”  Electronic Materials Conference, Salt Lake City, Utah, June 2003.

Conference Paper

164

2003

T. R. Taylor, P. J. Hansen, B. Acikel, N. Pervez, R. A. York, and J. S. Speck, “The influence of stoichiometry on the dielectric properties of sputtered strontium titanate thin films”,  J.  Applied Physics, vol. 93, no. 6, Sept 2003,  pp. 3390-3396

Journal Paper

163

2003

J.L. Serraiocco, P.J. Hansen, T.R. Taylor, J.S. Speck, and R.A. York, "Compact Ferroelectric Reflection Phase Shifters at X-Band," IEEE International Microwave Symposium Digest IMS2003, Philadelphia, PA, June 2003, vol. 3, pp. 1993-1996.

Conference Paper

162

2003

P.C. Jia, L.-Y. Chen, A. Alexanian, and R.A. York, “Broadband High Power Amplifier using Spatial Power Combining Technique”, IEEE International Microwave Symposium Digest IMS2003, Philadelphia, PA, June 2003, vol. 3, pp. 1871-1874

Conference Paper

161

2003

P. F. Maccarrini and R.A. York, “Coupled Phase-Locked Loop Arrays for Beam Steering”, IEEE International Microwave Symposium Digest IMS2003, Philadelphia, PA, June 2003, vol. 3, pp. 1689-1692

Conference Paper

160

2003

J. Buckwalter, T. Heath, and R.A. York, “Synchronization Design of a Coupled Phase-Locked Loop,” IEEE Trans. Microwave Theory and Tech., vol. 51, no. 3, March 2003, pp. 952-960

Journal Paper

159

2003

R.A. York,  “Synchronization of oscillating systems for microwave antennas and RF Electronics”, Proceedings of the 7th Experimental Chaos Conference, (AIP no. 676), 2003, pp. 15-25

Conference Paper