Search Results - "Romanofsky, R R"

Past, present and future of ferroelectric and multiferroic thin films for array antennas by Romanofsky, Robert R., Toonen, Ryan C.

“…In addition to providing a number of microwave components with frequency agility and voltage-controlled impedance matching, ferroelectric thin films have…”
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Epitaxial ferroelectric Ba0.5Sr0.5TiO3 thin films for room-temperature tunable element applications by Chen, C. L., Feng, H. H., Zhang, Z., Brazdeikis, A., Huang, Z. J., Chu, W. K., Chu, C. W., Miranda, F. A., Van Keuls, F. W., Romanofsky, R. R., Liou, Y.

“…Perovskite Ba0.5Sr0.5TiO3 thin films have been synthesized on (001) LaAlO3 substrates by pulsed laser ablation. Extensive x-ray diffraction, rocking curve, and…”
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Microwave Power Detection With Voltage-Gated Graphene by Gasper, Michael R., Toonen, Ryan C., Varaljay, Nicholas C., Romanofsky, Robert R., Miranda, Felix A.

“…Commercially available, chemical vapor deposition grown, graphene has been used to realize voltage-gate tunable, microwave power detectors. Corbino disc…”
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Advances in Scanning Reflectarray Antennas Based on Ferroelectric Thin-Film Phase Shifters for Deep-Space Communications by Romanofsky, Robert R.

“…Though there are a few examples of scanning phased array antennas that have flown successfully in space, the quest for ldquolow costrdquo high-efficiency…”
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Real-Time Wireless Pressure Sensing System for Stall and Loading Measurements in the Rotating Frame of Reference for a Low Speed Compressor by Scardelletti, Maximilian C., Kulkarni, Sameer, Romanofsky, Robert R.

“…In this paper the fabrication and characterization of a novel wireless pressure sensor system that can monitor and report real-time changes in pressure on the…”
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Study of behavior of digital modulations for beam steerable reflectarray antennas by Fuqin Xiong, Romanofsky, R.R.

“…This paper investigates the bit error rate (BER) performance of digital modulations in a system with a scanning reflectarray antenna. A reflectarray causes…”
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Small-Size X-Band Active Integrated Antenna With Feedback Loop by Mueller, C.H., Lee, R.Q., Romanofsky, R.R., Kory, C.L., Lambert, K.M., Van Keuls, F.W., Miranda, F.A.

“…A small-sized active integrated antenna (AIA), consisting of a transmission feedback oscillator loaded with a microstrip antenna is presented in this paper…”
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BaxSr1−xTiO3 Thin Film Ferroelectric-Coupled Microstripline Phase Shifters with Reduced Device Hysteresis by Miranda, Félix A., Mueller, Carl H., Van Keuls, Frederick W., Romanofsky, Robert R.

“…In this work, we present experimental results on the performance of coupled microstripline phase shifters (CMPS) fabricated using BaxSr1−xTiO3 (BST)…”
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Structural and dielectric properties of epitaxial Ba1−xSrxTiO3/Bi4Ti3O12/ZrO2 heterostructures grown on silicon by Canedy, C. L., Aggarwal, S., Li, Hao, Venkatesan, T., Ramesh, R., Van Keuls, F. W., Romanofsky, R. R., Miranda, F. A.

“…We report on the dielectric properties of an epitaxial heterostructure comprised of Ba1−xSrxTiO3, Bi4Ti3O12, and (ZrO2)0.91(Y2O3)0.09 grown on silicon…”
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A model for ferroelectric phase shifters by Romanofsky, R.R., Qureshi, A.H.

“…Novel microwave phase shifters consisting of coupled microstriplines on thin ferroelectric films have been demonstrated recently. A theoretical model useful…”
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Design and development of ferroelectric tunable HTS microstrip filters for Ku- and K-band applications by Subramanyam, G, Van Keuls, F.W, Miranda, F.A, Romanofsky, R.R, Warner, J.D

“…In the past few years, our group has designed, fabricated and tested several ferroelectric tunable components, in collaboration with NASA Glenn Research…”
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Thermoelectric Graphene Nano-Constrictions as Detectors of Microwave Signals by Gasper, Michael R., Toonen, Ryan C., Varaljay, Nicholas C., Romanofsky, Robert R., Miranda, Felix A.

“…Microwave power detectors were realized using nano-constrictions fabricated from commercially-available monolayer graphene, synthesized by means of chemical…”
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A cryogenic K-band ground terminal for NASA'S direct-data-distribution space experiment by Romanofsky, R.R., Warner, J.D., Alterovitz, S.A., Covey, L., Smith, A., Newman, P., Duh, K.G.

“…A K-band receiver terminal has been designed for /spl ap/77-K operation to support the NASA Glenn Research Center's direct-data-distribution (D/sup 3/) spare…”
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Correction factor for determining the London penetration depth from strip resonators by Romanofsky, R.R.

“…The strip resonator technique is a popular way to measure the temperature (T)-dependent London penetration depth /spl lambda//sub L/(T) in superconducting thin…”
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A K-band (HTS,gold)/ferroelectric thin film/dielectric diplexer for a discriminator-locked tunable oscillator by Miranda, F.A., Subramanyam, G., Van Keuls, F.W., Romanofsky, R.R.

“…The performance of a K-band conductor/ferroelectric thin film/dielectric tunable diplexer that is being developed as a critical part of a discriminator-locked…”
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Design and development of ferroelectric tunable microwave components for Ku- and K-band satellite communication systems by Miranda, Felix A, Subramanyam, Guru, Van Keuls, Frederick W, Romanofsky, Robert R, Warner, Joseph D, Mueller, Carl H

“…Integration of a high-temperature superconductor with a nonlinear dielectric ferroelectric such as strontium titanate, i.e., SrTiO3 (STO), has created a new…”
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ERROR VECTOR MEASUREMENTS OF BST COUPLED MICROSTRIPLINE PHASE SHIFTERS (CMPS) USING DIFFERENT TYPES OF MODULATION by MUELLER, CARL H., VAN KEULS, FREDERICK W., ROMANOFSKY, ROBERT R., MIRANDA, FÉLIX A.

“…Error vector measurements (EVM) are used to investigate whether the nonlinear properties of a ferroelectric coupled microstrip phase shifter (CMPS) impact the…”
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Current status of thin film (Ba,Sr)TiO3 tenable microwave components for rf communications by Van Keuls, F. W., Romanofsky, R. R., Mueller, C. H., Warner, J. D., Canedy, C. L., Ramesh, R., Miranda, F. A.

“…The performance of proof-of-concept ferroelectric microwave devices has been moving steadily closer to the level needed for satellite and other rf…”
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Ferroelectric thin-film based electrically tunable Ku-band coplanar waveguide components by Subramanyam, G., Mohsina, N., Al Zaman, A., Miranda, F., Van Keuls, F., Romanofsky, R., Warner, J.

“…Barium strontium titanate Ba/sub 0.6/Sr/sub 0.4/TiO/sub 3/ thin-film based tunable coplanar waveguide (CPW) components were studied in this research. The CPW…”
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Aku-band gold/baxsr1-xtio3/laalo3 conductor/thin-film ferroelectric microstrip line phase shifter for room-temperature communications applications by Van Keuls, F. W., Romanofsky, R. R., Varaljay, N. D., Miranda, F. A., Canedy, C. L., Aggarwal, S., Venkatesan, T., Ramesh, R.

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