Results 271 to 280 of about 87,553 (311)

A coupled electrical-thermal impedance matching model for design optimization of thermoelectric generator

Applied Energy, 2020
Zhi-Zhu He
exaly   +2 more sources

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A Tunable Electrical Impedance Matching System for Dual-Frequency Transducers

2024 17th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI)
Zhitian Shen, Weiwei Shao, Yaoyao Cui
exaly   +2 more sources

Electrical Impedance Matching of PZT NanoGenerators

Volume 4: 22nd Design for Manufacturing and the Life Cycle Conference; 11th International Conference on Micro- and Nanosystems, 2017
PZT nanofibers are piezoelectric and can produce a relatively high electrical output under strain that is useful for self-powered nanogenerators. To obtain maximum power output from these devices, their internal impedance needs to be matched with their applicable load impedance. Electrical impedance measurements of PZT nanofibers were performed using a
Richard Galos, Yong Shi, Zhongjing Ren, Hao Sun   +3 more
openaire   +1 more source

Electrical impedance matching networks based on filter structures for high frequency ultrasound transducers

Sensors and Actuators A: Physical, 2016
Ju-Young Moon, Junsu Lee, Jin Ho Chang
exaly   +2 more sources

An electrically small impedance-matched microstrip antenna design

IEEE Antennas and Propagation Society International Symposium (IEEE Cat. No.02CH37313), 2003
In traditional antenna design, a rule of thumb is that an impedance-matched antenna has to be wavelength compatible in size. It is not possible to design an electrically small antenna with matched impedance. In our previous studies, it was found that the operating frequency of a patch antenna could be reduced to 1/3 or even 1/4 of the original ...
M.C. Liang, Y.M. Chen, C.C. Huang, W.S. Chen   +3 more
openaire   +1 more source

Non-Foster impedance matching of electrically small antennas

2010 IEEE Antennas and Propagation Society International Symposium, 2010
When the size of an antenna is electrically small, the antenna is neither efficient nor a good radiator because most of the input power is stored in the reactive near-field region and little power is radiated in the far-field region. As demonstrated in [1]- [2], the radiation quality factor of small antennas is definitely high.
null Keum-Su Song, R G Rojas
openaire   +1 more source

Non-Foster Impedance Matching of Electrically-Small Antennas

IEEE Transactions on Antennas and Propagation, 2009
Electrically-small antennas present high-Q impedances characterized by large reactances and small radiation resistances. For such antennas, the effectiveness of passive matching is severely limited by gain-bandwidth theory, which predicts narrow bandwidths and/or poor gain.
S.E. Sussman-Fort, R.M. Rudish
openaire   +1 more source

A design methodology for impedance-matched Electrically Small parasitic superdirective arrays

2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2015
This paper presents a method for designing impedance-matched parasitic superdirective Electrically Small Antenna (ESA) arrays. The proposed method uses the current excitation coefficients for calculating the required loads for the parasitic elements. The proposed method is validated via the design of a parasitic two-element superdirective ESA.
Haskou, Abdullah, Collardey, Sylvain, Sharaiha, Ala   +2 more
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Mechanical and electrical impedance matching in a piezoelectric beam for Energy Harvesting

The European Physical Journal Special Topics, 2015
A piezoelectric beam is one of transducers for energy harvesting. It provides easy implementation and good performance in changing mechanical stress into electric voltage. In order to maximize output power, it is important to provide mechanical and electrical impedance matching.
A. Koszewnik, P. Grześ, W. Walendziuk
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Stability of non-Foster circuits for broadband impedance matching of electrically small antennas

2015 IEEE Radio and Wireless Symposium (RWS), 2015
Non-Foster circuits are promising for numerous microwave and antenna applications because they are not limited by the gain-bandwidth product. However, the stability of these circuits is a key issue for their design. In this paper we introduce a three-step scheme to systematically stabilize a non-Foster circuit (NFC) topology that can be used in ...
Aseim M. Elfrgani, Roberto G. Rojas
openaire   +1 more source