Results 281 to 290 of about 139,401 (323)
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IEEE Transactions on Biomedical Engineering, 2021
Objective: The inverse problem of computing conductivity distributions in 2D and 3D objects interrogated by low-frequency electrical signals, which is called Electrical Impedance Tomography (EIT), is treated using a Method-of-Moment technique. Methods: A
Christos Dimas +2 more
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Objective: The inverse problem of computing conductivity distributions in 2D and 3D objects interrogated by low-frequency electrical signals, which is called Electrical Impedance Tomography (EIT), is treated using a Method-of-Moment technique. Methods: A
Christos Dimas +2 more
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An electrically small impedance-matched microstrip antenna design
IEEE Antennas and Propagation Society International Symposium (IEEE Cat. No.02CH37313), 2003In 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 +3 more
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Non-Foster impedance matching of electrically small antennas
2010 IEEE Antennas and Propagation Society International Symposium, 2010When 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
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MATLAB/Simulink Pulse-echo Ultrasound System Simulator with Electrical Impedance Matching
JSTS Journal of Semiconductor Technology and Science, 2018In an ultrasound system, impedance matching between a transducer and an electronics is one of the crucial factors to determine the performance. An electronics must operate with different transducers, which have their characteristic impulse responses and ...
Sangmin Shin, Tae Hoon Kim, Suhwan Kim
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Non-Foster Impedance Matching of Electrically-Small Antennas
IEEE Transactions on Antennas and Propagation, 2009Electrically-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
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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, 2015This 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 +2 more
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IEICE Transactions on Electronics, 2005
In order to reduce the size of a wireless system, we propose a design theory for the broadband impedance matching circuit which connects an electrically small antenna (ESA) to a semiconductor amplifier. We confirmed its validity for the case of connection between a small slot loop antenna with a small radiation resistance of R a = 0.776 Ω and a ...
Keiji Yoshida +2 more
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In order to reduce the size of a wireless system, we propose a design theory for the broadband impedance matching circuit which connects an electrically small antenna (ESA) to a semiconductor amplifier. We confirmed its validity for the case of connection between a small slot loop antenna with a small radiation resistance of R a = 0.776 Ω and a ...
Keiji Yoshida +2 more
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Multiband Impedance Matching Using Microstrip-Embedded MTM-EBGs
IEEE transactions on microwave theory and techniques, 2023This work investigates a general method of multiband impedance matching using a double-stub tuner (DST) loaded with metamaterial-based electromagnetic bandgap structures (MTM-EBGs).
Braden P. Smyth, A. Iyer
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A Shifting Current Mirror Driver Circuit for Electrical Impedance Tomography Applications
IEEE Transactions on Circuits and Systems - II - Express Briefs, 2023This brief describes a high power efficiency, high linearity current driver for wearable electrical impedance tomography (EIT). It is extremely important to improve the power efficiency of the current driver circuit for wearable EIT applications because ...
Jiajie Huang +6 more
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Frequency domain analysis of a piezoelectric energy harvester with impedance matching network
Energy Harvesting and Systems, 2022Piezoelectric energy harvesters are electromechanical systems, capable to convert ambient dispersed mechanical vibrations into usable electrical energy.
M. Bonnin, Kailing Song
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