Results 231 to 240 of about 2,695 (261)
Some of the next articles are maybe not open access.
Stepped-Impedance Defected Ground Structure
TENCON 2005 - 2005 IEEE Region 10 Conference, 2005The negative image of a microstrip stepped-impedance lowpass filter (LPF) or hi-Z, low-Z filter is used on the ground plane to produce wide and deep stopband. This structure is simpler in design and more compact in size compared to conventional bandstop structures.
Nemai Karmakar, Rita Li Ling
openaire +1 more source
A grounded gyrator based on the impedance-matrix†
International Journal of Electronics, 1971Abstract An appropriately chosen controlled-source, in association with a current-controlled negative resistance, can be used to produce a grounded, high Q, impedance-matrix realization of the gyrator. Details of one such realization are given here.
M. A. REDDY, Y. G. RAO
openaire +1 more source
Transient Ground Impedances According to Shapes of Grounding Electrodes
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, 2006This paper presents the transient behaviors of grounding system impedance against lightning impulse currents. The dynamic characteristics of the deeply driven ground rod and grounding grid subjected to the impulse current were investigated. The transient ground impedance strongly depends on the configuration and size of grounding electrodes and the ...
openaire +1 more source
Optimized geometry for ground impedance measurement
The Journal of the Acoustical Society of America, 2007The two-microphone method is a convenient and well-known procedure for the in situ determination of the surface impedance both in room acoustics and for outdoor use. In light of its possible use in a future revision of ANSI S1.18-1999, its sensitivity towards measurement errors has been investigated.
Roland Kruse, Volker Mellert, Ping Rong
openaire +1 more source
The mutual impedance of collinear grounded wires
Geophysics, 1943Abstract The formula of R. M. Foster for the mutual impedance of grounded wires lying on the surface of the earth has been evaluated for the case where the wires are grounded at points which are collinear and equally spaced upon the surface of a homogeneous earth.
openaire +2 more sources
Impedance models for grass-covered ground
The Journal of the Acoustical Society of America, 1977Three different models are described in an attempt to account for the frequency dependence of measured impedances of grass-covered ground. These are (a) a homogeneous ground of constant porosity, (b) a finite layer, also of constant porosity, overlying an infinite impedance, and (c) porosity decreasing with depth. The latter structure provides the best
openaire +1 more source
Analysis of Grounding Electrode Input Impedance Calculation
2011The paper deals with an assessment of transient impedance of the grounding electrode. The mathematical model is based on the thin wire antenna theory and related Pocklington integro- differential equation in the frequency domain, which is numerically treated via Galerkin-Bubnov variant of indirect Boundary Element Method (GB- IBEM).
Poljak, Dragan, Čavka, Damir
openaire +3 more sources
Stator Intermittent Ground Fault Detection in High-Impedance Grounded Generators
2023 IEEE 32nd International Symposium on Industrial Electronics (ISIE), 2023Nader Safari-Shad, Russ Franklin
openaire +1 more source
A systematic review on grounding impedance measurement in electrical installations
Electric Power Systems Research, 2023André Eugenio Lazzaretti +1 more
exaly