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113 results on '"Fang, Yunnan"'

10. Dual‐band filtering power amplifier with extended passband bandwidths and wide stopband rejection.

Author

Dong, Gaoya, Yang, Xiaolong, Fang, Yunnan, and Tenzeris, Manos M.

Subjects
POWER amplifiers, ELECTRIC power filters, BANDPASS filters, CIRCUIT complexity, IMPEDANCE matching, BANDWIDTHS, QUALITY factor
Abstract

This article presents a dual‐band filtering power amplifier (DB‐FPA) with extended passband bandwidths and wide stopband rejection, which is helpful in reducing the number of microwave components in the dual‐band radio frequency front end, resulting in compact circuit size and low loss. In the designed DB‐FPA, a wideband low‐pass filter is applied as the input matching network (IMN) to provide wideband impedance matching and good stopband rejection, while a dual‐band filtering impedance transformation is adopted as the output matching network (OMN) to provide dual‐band impedance matchings and filtering responses simultaneously. Specifically, the IMN is constructed by high‐impedance transmission‐line sections and low‐impedance open‐circuit stubs. The OMN is designed based on the specific external quality factors and coupling coefficients during two bands, resulting in dual‐band impedance transformations and dual‐band filtering responses. Then, based on the above IMN and OMN, the design procedure of the presented DB‐FPA is summarised. To verify the proposed idea, a novel DB‐FPA has been fabricated and measured. During the two frequency bands, the measured maximum power added efficiencies are 55.11% and 47.78% within 33.0 dBm input power, while the measured peak gains are 15.4 and 14.0 dB within 15.0 dBm input power. [ABSTRACT FROM AUTHOR]

Published
2023
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19. Surface Modification of Polyimide Films for Inkjet-Printing of Flexible Electronic Devices

Author

Fang, Yunnan

Subjects
Technology & Engineering / Electronics
Abstract

Kapton polyimide films are one of the most commonly used flexible and robust substrates for flexible electronic devices due to their excellent thermal, chemical, mechanical, and electrical properties. However, such films feature an inert and highly hydrophobic surface that inhibits the deposition of functional materials with water-based fluids (solutions, suspensions, inkjet inks, etc.), which raise the need for their surface modification to reduce their inherent surface inertness and/or hydrophobicity in order to allow for the fabrication of electronic devices on the substrates. Traditional Kapton surface modification approaches use harsh conditions that not only cause environmental and safety problems but also compromise the structural integrity and the properties of the substrates. This chapter focuses on two recently-developed mild and environmentally friendly wet chemical approaches for surface modification of Kapton HN films. Unlike the traditional methods that target the polyimide matrix of Kapton films, these two methods target the slip additive embedded in the polyimide matrix. The surface modified Kapton films resulted from these two methods allowed for not only great printability of both water- and organic solvent-based inks (thus facilitating the full-inkjet-printing of entire flexible electronic devices) but also strong adhesion between the inkjet-printed traces and the substrate films.

Published
2018

30. Nanotechnology-Empowered Flexible Printed Wireless Electronics: A Review of Various Applications of Printed Materials

Author

Eid, Aline, Hester, Jimmy, Fang, Yunnan, Tehrani, Bijan, Nauroze, Syed Abdullah, Bahr, Ryan, and Tentzeris, Manos M.

Abstract

In this article, the particular importance of nanotechnology-enabled materials associated with additive manufacturing techniques for the realization of radio-frequency (RF) components and modules for Internet of Things (IoT) and millimeter-wave (mm-wave) applications is discussed.

Published
2019
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31. Rapid bioenabled formation of ferroelectric BaTi[O.sub.3] at room temperature from an aqueous salt solution at near neutral pH

Author

Ahmad, Gul, Dickerson, Matthew B., Ye Cai, Jones, Sharon E., Ernst, Eric M., Vernon, Jonathan P., Haluska, Michael S., Fang, Yunnan, Jiadong Wang, Subramanyam, Guru, Naik, Rajesh R., and Sandhage, Kenneth H.

Subjects
Coordination compounds -- Research, Coordination compounds -- Chemical properties, Titanates -- Research, Titanates -- Chemical properties, Chemistry
Abstract

The peptides identified by phage display biopanning have induced the rapid, room-temperature formation of tetragonal barium metatitanate (BaTi[O.sub.3]) from an aqueous precursor solution at near neutral pH. The ability of peptides to promote the rapid formation of functional crystalline multicomponent ceramics has provided new opportunities for the integration of functional materials with low-temperature.

Published
2008

37. Graphene enhanced wireless sensors

Author

Le, Taoran, primary, Thai, Trang, additional, Lakafosis, Vasileios, additional, Tentzeris, Manos, additional, Lin, Ziyin, additional, Fang, Yunnan, additional, Sandhage, Kenneth, additional, and Wong, Chingping, additional

Published
2012
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40. Oriented Growth of Al2O3:ZnO Nanolaminates for Use as Electron‐Selective Electrodes in Inverted Polymer Solar Cells

Author

Cheun, Hyeunseok, primary, Fuentes‐Hernandez, Canek, additional, Shim, Jaewon, additional, Fang, Yunnan, additional, Cai, Ye, additional, Li, Hong, additional, Sigdel, Ajaya K., additional, Meyer, Jens, additional, Maibach, Julia, additional, Dindar, Amir, additional, Zhou, Yinhua, additional, Berry, Joseph J., additional, Bredas, Jean‐Luc, additional, Kahn, Antoine, additional, Sandhage, Kenneth H., additional, and Kippelen, Bernard, additional

Published
2012
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43. A dual-electrolyte based air-breathing regenerative microfluidic fuel cell with 1.76V open-circuit-voltage and 0.74V water-splitting voltage

Author

Zou, Haiyang, Chen, Jun, Fang, Yunnan, Ding, Jilai, Peng, Wenbo, and Liu, Ruiyuan

Abstract

The open circuit voltage of a conventional H2-O2fuel cell is limited to ~1.23V under atmospheric pressure, which limits the efficiency of the system. Here, we reported a dual-electrolyte microfluidic fuel cell system (DEFC), which could stably deliver an open circuit voltage up to 1.76V at room temperature under atmospheric pressure, and a peak power density of 145mW/cm2, improved by 3 times compared with that in single electrolyte mode. When operated in the reverse mode, the microfluidic cell can be used for water electrolysis, demonstrating a water split voltage of ~0.74V and a round trip voltage efficiency of 83.5% at a current density of 100mA/cm2. The neutralization energy of the two electrolytes, which could be wasted as heat, can be directly utilized to produce electricity or split water with high efficiency. Given the DEFC's features of high open-circuit voltage, low water splitting voltage, and room-temperature operation condition, the reported DEFCs technology presents a superior route for high-efficiency energy conversion and storage system that could revolutionize the fields of large-scale energy storage and portable power systems.

Published
2016
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47. Layer-By-Layer Dendritic Growth of Hyperbranched Thin Films for Surface Sol-Gel Syntheses of Conformal, Functional, Nanocrystalline Oxide Coatings on Complex 3D (Bio)silica Templates

Author

Wang, Guojie, primary, Fang, Yunnan, additional, Kim, Philseok, additional, Hayek, Ali, additional, Weatherspoon, Michael R., additional, Perry, Joseph W., additional, Sandhage, Kenneth H., additional, Marder, Seth R., additional, and Jones, Simon C., additional

Published
2009
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50. Rapid Bioenabled Formation of Ferroelectric BaTiO3at Room Temperature from an Aqueous Salt Solution at Near Neutral pH

Author

Ahmad, Gul, primary, Dickerson, Matthew B., additional, Cai, Ye, additional, Jones, Sharon E., additional, Ernst, Eric M., additional, Vernon, Jonathan P., additional, Haluska, Michael S., additional, Fang, Yunnan, additional, Wang, Jiadong, additional, Subramanyam, Guru, additional, Naik, Rajesh R., additional, and Sandhage, Kenneth H., additional

Published
2007
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