Topic
Electrical impedance
About: Electrical impedance is a research topic. Over the lifetime, 36015 publications have been published within this topic receiving 371891 citations. The topic is also known as: electrical impedance & complex impedance.
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TL;DR: In this paper, a Rogowski coil with a capacitive shieid is treated as a distributed circuit, so that the toroidally wound coil acts as a delay line, and it is shown that the high-frequency response is limited by the transit time around this delay line.
90 citations
TL;DR: In this article, a survey of the more common distributed elements, including the new distribution-of-activation-energies element, is presented, and their responses are compared graphically and compared to one another in both 2-D complex plane projections and 3-D perspective plots.
90 citations
TL;DR: In this paper, the concept of connected (or coupled) dipoles in a linear array, which improves wideband performance, is examined, and a long wire with multiple feeds is the model, using rigorous moment method analysis.
Abstract: The concept of connected (or coupled) dipoles in a linear array, which improves wideband performance, is examined. A long wire with multiple feeds is the model, using rigorous moment method analysis. The edge waves of the current appear not to be attenuated; around half-wave dipole length, the current peaks are one wavelength apart, with deep nulls. For dipole lengths around quarter-wave the current peaks and dips are modest. This trend continues to shorter dipoles; for lengths of 0.1 wavelength or less, the current is nearly constant along the array. This approximates the current sheet of Wheeler; the impedance mismatch is much less severe than for an array of unconnected dipoles of the same dimensions.
90 citations
TL;DR: In this paper, a Yagi antenna implemented in a thin cavity-down ceramic ball grid array package in low temperature co-fired ceramic (LTCC) technology is reported, intended for use in highly integrated differential 60 GHz radios, has achieved a 10dB impedance bandwidth of 2.3 GHz from 60.6 to 62.9 GHz and a peak gain of 6 dBi at 62 GHz.
Abstract: A Yagi antenna implemented in a thin cavity-down ceramic ball grid array package in low temperature cofired ceramic (LTCC) technology is reported. The antenna, intended for use in highly integrated differential 60-GHz radios, has achieved a 10-dB impedance bandwidth of 2.3 GHz from 60.6 to 62.9 GHz and a peak gain of 6 dBi at 62 GHz.
90 citations
TL;DR: In this article, the authors report the dielectric, impedance, modulus and conductivity study of BaBi 4 Ti 4 O 15 ceramic synthesized by solid state reaction.
Abstract: In this work, we report the dielectric, impedance, modulus and conductivity study of BaBi 4 Ti 4 O 15 ceramic synthesized by solid state reaction. X-ray diffraction (XRD) pattern showed orthorhombic structure with space group A21am confirming it to be an m = 4 member of the Aurivillius oxide. The frequency dependence dielectric study shows that the value of dielectric constant is high at lower frequencies and decreases with increase in frequency. Impedance spectroscopy analyses reveal a non-Debye relaxation phenomenon since relaxation frequency moves towards the positive side with increase in temperature. The shift in impedance peaks towards higher frequencyside indicates conductionin material andfavouringof the longrangemotion of mobile charge carriers. The Nyquist plot from complex impedance spectrumshows only one semicircular arc representingthe grain effect in the electrical conduction. The modulus mechanism indicates the non-Debye type of conductivity relaxation in the material, which is supported by impedance data. Relaxation times extracted using imaginary part of complex impedance (Z ′′ ) and modulus (M ′′ ) were also found to follow Arrhenius law. The frequency dependent AC conductivity at different temperatures indicates that the conduction process is thermally activated. The variation of DC conductivity exhibits a negative temperature coefficient of resistance behaviour.
90 citations