Results 251 to 260 of about 88,039 (271)
Some of the next articles are maybe not open access.
Mechanical and electrical impedance matching in a piezoelectric beam for Energy Harvesting
The European Physical Journal Special Topics, 2015A 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
openaire +1 more source
Design of a non-Foster impedance matching network for electrically small antennas
2013 13th Mediterranean Microwave Symposium (MMS), 2013As an antenna becomes smaller, its input reactance increases to greater than its input resistance, resulting in a significant increase of it radiation quality factor and drastic decrease of its bandwidth. Therefore, there is a need for a matching network at the antenna terminals, which may be devised by negative impedance converters (NIC).
Homayoon Oraizi, Seyyed Hamzeh Hashemi
openaire +1 more source
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 ...
openaire +1 more source
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 ...
openaire +1 more source
Optimized Transmission Electrical Broadband Impedance Matching for PolyCMUT
2022 IEEE International Ultrasonics Symposium (IUS), 2022Gabriel Guerreiro +4 more
openaire +1 more source
Non-Foster impedance matching of an electrically small loop antenna for biomedical telemetry
2017 IEEE Asia Pacific Microwave Conference (APMC), 2017The demand for miniaturized antennas in biomedical telemetry has been steadily increasing. In biomedical telemetry, electrically small antennas are integrated into exterior portable devices owing to their size in respect of the wavelength to process the received sensing information and power battery-less implantable medical devices (IMDs).
Mohamed Manoufali, Amin Abbosh
openaire +1 more source
Study of power efficiency of non-foster impedance matching for electrically small antenna
2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 2014Electrically small antenna has attracted much attention because of its potential application in compact wireless communication and sensing systems. Matching is needed before any practical application for an electrically small antenna (ka < 1, k — wavelength number, a — radius of the smallest sphere that can surround the antenna) because it has an input
Xiaoju Yu, Qi Tang, Min Liang, Hao Xin
openaire +1 more source
Sensors and Actuators A: Physical, 2016
Abstract An electrical impedance matching (EIM) network is proposed to achieve the broad bandwidth of a high frequency ultrasound transducer and to improve the signal-to-noise ratio (SNR) of an ultrasound image. The proposed EIM network is based on a general filter structure, i.e., either low-pass filter (LPF) or high-pass filter (HPF) structure ...
Ju-Young Moon, Junsu Lee, Jin Ho Chang
openaire +1 more source
Abstract An electrical impedance matching (EIM) network is proposed to achieve the broad bandwidth of a high frequency ultrasound transducer and to improve the signal-to-noise ratio (SNR) of an ultrasound image. The proposed EIM network is based on a general filter structure, i.e., either low-pass filter (LPF) or high-pass filter (HPF) structure ...
Ju-Young Moon, Junsu Lee, Jin Ho Chang
openaire +1 more source
Impedance Matching and Electric Field Penetration in Metal Vapour Lasers
1996In metal vapour lasers (MVL), the lasing atoms are excited by collision with free electrons. The electrons gain their energy from the electric field (EF) within the plasma. High electron energy (in copper vapour laser, about 10 e V) is required in order to create maximal population inversion.
openaire +1 more source
2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013
This paper investigates the limitation of Negative Impedance Converter (NIC) using Operational Amplifier (Op-Amp). The limitation is theoretical analyzed and then experimentally verified. The results show that, the Op-Amp based NIC has complex input impedance.
Yizhu Shen, Tan-Huat Chio
openaire +1 more source
This paper investigates the limitation of Negative Impedance Converter (NIC) using Operational Amplifier (Op-Amp). The limitation is theoretical analyzed and then experimentally verified. The results show that, the Op-Amp based NIC has complex input impedance.
Yizhu Shen, Tan-Huat Chio
openaire +1 more source
A discussion on the quality factor of impedance matched electrically small wire antennas
IEEE Transactions on Antennas and Propagation, 2005The quality factors of several impedance matched, electrically small wire antennas are compared as a function of matching technique and antenna geometry. The antennas considered have the same height and wire diameter, and they are designed to be self-resonant at approximately the same frequency.
openaire +1 more source