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23 results on '"self impedance"'

1. Highly accurate computation of Carson formulas based on exponential approximation.

Author

Krolo, Ivan, Vujević, Slavko, and Modrić, Tonći

Subjects
*ELECTRIC lines, *ELECTRIC impedance, *APPROXIMATION theory, *COEFFICIENTS (Statistics), *MATHEMATICAL functions
Abstract

In this paper, analytical expressions for a highly accurate computation of Carson formulas are developed. Highly accurate analytical expressions for per-unit-length (pul) self and mutual impedance corrections are now reduced to two linear combinations of 50 functions. Coefficients of these linear combinations are computed using exponential approximation of integrals’ kernel function. Proposed algorithm has simplified computation in comparison with other highly accurate numerical algorithms. Results computed by proposed algorithm and by two approximation methods are compared with 7‐digit accurate results computed by piecewise quadratic approximation for large frequency range. [ABSTRACT FROM AUTHOR]

Published
2018
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3. Interposers for power supply voltage noise reduction.

Author

Uematsu, Yutaka, Yagyu, Masayoshi, and Osaka, Hideki

Abstract

This report proposes low power supply noise interposers with two types of structures based on embedding technologies. These structures reduce (i) self-noise and (ii) transfer-noise. We designed and developed these two structures and evaluated them experimentally. Using small chip components (0402) permitted interposer heights of less than 0.6 mm. The measurement results indicate the following: (i) reductions of on-chip power supply noise on the order of several hundreds of MHz; (ii) S21 less than −60dB achieved from 10 MHz to a few GHz. [ABSTRACT FROM PUBLISHER]

Published
2012
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6. Computation of Carson formulas using piecewise approximation of kernel function

Author

Slavko Vujević, Ivan Krolo, and Tonći Modrić

Subjects
Carson formulas, mutual impedance, numerical algorithm, piecewise approximation, self-impedance, Self impedance, Mechanics of Materials, Mechanical Engineering, Modeling and Simulation, Computation, Piecewise, Applied mathematics, Mutual impedance, Software, Computer Science Applications, Mathematics
Abstract

Novel approach for the high-accurate computation of Carson formulas is presented. Carson formulas are used for computation of per-unit length (pul) self and mutual impedances of infinitely long parallel conductors. Numerical algorithm described in this paper uses a piecewise approximation of the kernel function which appears in the Carson formula corrections. Approximated kernel function is multiplied by the rest of the integrands in the impedance correction expressions and analytically integrated. By using the proposed algorithm, highaccurate results with the desired computed n-digit accuracy can easily be obtained. Results computed by the proposed algorithm are compared with the two most commonly used approximation methods for large frequency range.

Published
2018

7. Computation of Carson Formulas Using Piecewise Quadratic Approximation

Author

Ivan Krolo, Slavko Vujević, Tonći Modrić, Begušić, Dinko, Rožić, Nikola, Radić, Joško, and Šarić, Matko

Subjects
020209 energy, Computation, Mathematical analysis, Approximation algorithm, 020206 networking & telecommunications, 02 engineering and technology, Finite element method, numerical algorithm, Carson formulas, self impedance, mutual impedance, piecewise quadratic approximation, Range (mathematics), Quadratic equation, Kernel (statistics), 0202 electrical engineering, electronic engineering, information engineering, Piecewise, Electrical impedance, Mathematics
Abstract

In this paper, an existing numerical algorithm for high-accurate computation of exact Carson formulas based on piecewise linear approximation is improved. Carson formulas are used for computing of per-unit-length (pul) self and mutual impedances of infinitely long parallel conductors. The proposed algorithm is based on piecewise quadratic approximation of kernel function and analytical integrations of approximated kernel function multiplied by the rest of two integrands. Using proposed algorithm, high-accurate results with desired computer machine n-digit accuracy can be easily obtained. Total number of sample points is significantly decreased with proposed algorithm in comparison with piecewise linear approximation. Results computed by two approximation methods are compared with high- accurate results computed by proposed numerical algorithm for large frequency range.

Published
2017

8. Adaptive nulling of a linear dipole array in the presence of mutual coupling

Author

Mohammad Ali Masnadi-Shirazi, Abbas Alighanbari, Naser Parhizgar, and Abbas Sheikhi

Subjects
Beamforming, Engineering, Computer simulation, business.industry, Dipole array, Topology, Computer Graphics and Computer-Aided Design, Computer Science Applications, Antenna array, Self impedance, Robustness (computer science), Electronic engineering, Electrical and Electronic Engineering, business, Mutual impedance, Microwave
Abstract

This article proposes a novel mutual impedance matrix model for compensating mutual coupling effects in adaptive array with application to adaptive nulling of interference signals. In the new method, extreme care has been taken into account for both self impedance and mutual impedance, relating to the mutual coupling effects. Numerical simulation results demonstrate the robustness and capability of this technique. By using the new method, it is found that both the accuracy of the positioning and depth of the nulls are significantly improved. Performance comparisons of the new methodology and several other previous techniques via a number of simulation are presented. © 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:30–38, 2014.

Published
2013
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9. Influence of mutual coupling between two vibrators on value of their resonant length

Author

Yeliseyeva, Nadezhda P.

Subjects
Physics::Atomic and Molecular Clusters, vibrator antenna, resonant arm length, radiation resistance, mutual impedance, self impedance, input resistance, Physics::Chemical Physics
Abstract

Fast-acting algorithms and programs for calculating and analyzing the input resistance and the resonant length of two connected inphase symmetric vibrators at arbitrary orientation and an arbitrary distance from each other based on the induced electromotive forces method has been developed. The vibrator elongation occurred at the distance between two thick parallel vibrators within ξ = 0.25...0.55l. At other distances shortening vibrators has been observed.

Published
2011

10. Design of Phase-Only Reconfigurable Linear Antenna Arrays Using Genetic Algorithms

Author

Mahanti, Gautam Kumar

Subjects
Optimization, Feed Network, Reconfigurable Array, Genetic Algorithms, Pencil Beam, Discrete Phase Shifter, Side Lobe Level, Mutual Impedance, Power Divider Network, Dynamic Range Ratio, Digital Attenuator, Pulse Basis Function, Linear Array, Dipole Antennas, Radiation Power Pattern, Phased Array, Mutual Coupling, Cosecant Square Pattern, Self Impedance, Dual Beam
Published
2006

11. Successive variational approximations of impedance parameters in a coupled antenna system

Author

M. Hu and Y. Hu

Subjects
Self impedance, Approximations of π, Mathematical analysis, Calculus, Shaping, Electrical and Electronic Engineering, Condensed Matter Physics, Impedance parameters, Mutual impedance, Electrical impedance, Orthogonalization, Excitation, Mathematics
Abstract

In this paper, a new variational formulation for a single impedance parameter of an m -antenna system is presented. This formulation enables one to determine any self impedance Z_{ii} , one at a time, merely by exciting antenna i alone and leaving all the other antennas open circuited. For determining any mutual impedance Z_{ij} , only two independent excitations, one the same as that used for determining Z_{ii} and the other for determining Z_{jj} , are required. Thus, if all the m(m+1)/2 impedance are required, only m independent excitation conditions are needed. In contrast to this, the formulation available in the literature is based on m(m+1)/2 independent excitation conditions. Because of a reduced number of excitation conditions and the way they are assumed, the physical nature of the problem is made simpler and easier to comprehend. Such comprehension helps considerably in the choice of trial current distributions for a specific application. Two methods of evaluating the successive higher-order approximations are also given. One is based upon an orthogonalization process, and the other is based upon the successive inversion of matrices. In the evaluation of a certain order approximation, both methods have the advantage of utilizing all the work already done for the lower-order approximations; and at the same time, additional work required is considerably reduced. It is believed that the formulation, as well as the two methods of successive approximations, will also be useful in other problems.

Published
1959
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12. Circular loci of currents and voltages in a general network

Author

Anatoli C. Seletzky

Subjects
Physics, Self impedance, Computer Networks and Communications, Control and Systems Engineering, Applied Mathematics, Signal Processing, Control engineering, Fixed frequency, Topology, Voltage
Abstract

A study is made of the expressions representing currents and voltages in a general network at fixed frequency. It is shown that both quantities follow circular loci when any one self impedance is varied.

Published
1936
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13. Mutual and Self‐Impedance for Coupled Antennas

Author

Charles W. Harrison and Ronold W. P. King

Subjects
Physics, Self impedance, Current (mathematics), law, Mathematical analysis, Phase (waves), General Physics and Astronomy, Dipole antenna, Input impedance, Radius, Antenna (radio), law.invention, Vector potential
Abstract

A general theory for the current in coupled antennas is formulated in terms of the vector potential and applied to determine the self‐impedance Zs1 and the mutual impedance Z12 of a center‐driven antenna in the presence of a second parallel, identical antenna which may be center‐driven or center‐loaded in an arbitrary way. Each antenna has a half‐length h, a radius a, and the distance between them is b. Curves are shown for Zs1 and Z12 for h=λ/4; Ω=2 ln (2h/a) = ∞, 30, 20, 10; 0.05≦b/λ≦0.4; and for h=λ/2; Ω=2 ln (2h/a) = 30, 20, 10; 0.05≦b/λ≦0.5. It is shown that except for the special case of an indefinitely thin antenna (Ω= ∞) the self‐impedance Zs1 of an antenna in the presence of a second antenna differs from the self‐impedance Z0 when the antenna is isolated and varies with b/λ. The input impedance Zlin is determined and plotted for the same values of h and Ω, and the same ranges of b/λ for the following special cases: 1. The antennas are both center‐driven in phase by identical generators. 2. The an...

Published
1944
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14. Mutual impedance and self-impedance of coupled parallel aerials

Author

B.J. Starkey and E. Fitch

Subjects
Physics, Self impedance, Current distribution, business.industry, Acoustics, Electrical engineering, Physics::Accelerator Physics, General Medicine, Physics::Classical Physics, business, Mutual impedance, Electrical impedance
Abstract

The paper describes an experimental investigation of the problem of mutual and self-impedances of coupled cylindrical aerials. It is shown that mutual-impedance values, calculated on the assumption that the aerial current distribution is sinusoidal, can be used with some success if appropriate values of self-impedance are used. An approximate method for finding these impedances is suggested.

Published
1950
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15. Theory of Electrically Small Complementary Pair with Inter-Element Coupling.

Author

AEROSPACE CORP EL SEGUNDO CALIF DEVELOPMENT OPERATIONS, Schroeder,Klaus G, Soo Hoo,Keith M, AEROSPACE CORP EL SEGUNDO CALIF DEVELOPMENT OPERATIONS, Schroeder,Klaus G, and Soo Hoo,Keith M

Abstract

In a previous report, the history of Complementary Pair Element Groups was discussed, and the application of this concept to the matching of electrically small antennas was shown. The measurements indicated a substantial improvement in efficiency as compared to matching with a simple load isolator absorbing the reflected power. In this report, the power delivered to the external region is analyzed for both an individual monopole, and a pair of monopoles, by establishing the scattering matrices for both cases. The potential gain is calculated for the pair over the individual monopole, and it is shown that the pair can deliver up to twice the power to the exterior region if the mutual impedance term is optimized. Various special cases are discussed, varying from full complementarity to zero complementarity, and general conclusions are presented on the optimization of gain-band-width product. Various types of decoys and ECM systems for aircraft and missiles are examples of potential applications of electrically small antennas and scatterers. Large, hardened, ground-based phased arrays and wideband communication base station antennas are typical phased-array applications in fixed stations. Vehicular applications encompass wideband direction finders, aircraft conformal antennas for various functions, and high-performance spacecraft antennas for communications and radar systems. (Author)

Published
1976

16. Technický výpočet záření soustav lineárních antén

Author

Pokorný, Michal, Puskely, Jan, Halm, Martin, Pokorný, Michal, Puskely, Jan, and Halm, Martin

Abstract

Tato práce se zabývá výpočtem směrových charakteristik a vstupních impedancí anténních soustav. V první části je tato problematika řešena na teoretické úrovni. Po definici základních parametrů antén je proveden rozbor vlastností dipólu konečné délky jako základního prvku anténních soustav. Poté následuje teorie anténních soustav a metody výpočtu vstupních impedancí dílčích prvků. Na základě těchto poznatků je pak vytvořen program v prostředí MATLAB, který realizuje zmíněné výpočty pro obecnou anténní soustavu., This project deals with methods of calculation of radiation patterns and input impedances of antenna arrays. The first part describes this issue at a theoretical level. After defining some fundamental parameters of antennas, there is an analysis of finite length dipole. It is followed by the theory of antenna arrays and means of input impedance calculation of antenna array elements. In the final part of the work, a program is designed on the basis of the theory. The program is MATLAB based and implements the above mentioned calculations.

17. Technický výpočet záření soustav lineárních antén

Author

Pokorný, Michal, Puskely, Jan, Halm, Martin, Pokorný, Michal, Puskely, Jan, and Halm, Martin

Abstract

Tato práce se zabývá výpočtem směrových charakteristik a vstupních impedancí anténních soustav. V první části je tato problematika řešena na teoretické úrovni. Po definici základních parametrů antén je proveden rozbor vlastností dipólu konečné délky jako základního prvku anténních soustav. Poté následuje teorie anténních soustav a metody výpočtu vstupních impedancí dílčích prvků. Na základě těchto poznatků je pak vytvořen program v prostředí MATLAB, který realizuje zmíněné výpočty pro obecnou anténní soustavu., This project deals with methods of calculation of radiation patterns and input impedances of antenna arrays. The first part describes this issue at a theoretical level. After defining some fundamental parameters of antennas, there is an analysis of finite length dipole. It is followed by the theory of antenna arrays and means of input impedance calculation of antenna array elements. In the final part of the work, a program is designed on the basis of the theory. The program is MATLAB based and implements the above mentioned calculations.

18. Technický výpočet záření soustav lineárních antén

Author

Pokorný, Michal, Puskely, Jan, Pokorný, Michal, and Puskely, Jan

Abstract

Tato práce se zabývá výpočtem směrových charakteristik a vstupních impedancí anténních soustav. V první části je tato problematika řešena na teoretické úrovni. Po definici základních parametrů antén je proveden rozbor vlastností dipólu konečné délky jako základního prvku anténních soustav. Poté následuje teorie anténních soustav a metody výpočtu vstupních impedancí dílčích prvků. Na základě těchto poznatků je pak vytvořen program v prostředí MATLAB, který realizuje zmíněné výpočty pro obecnou anténní soustavu., This project deals with methods of calculation of radiation patterns and input impedances of antenna arrays. The first part describes this issue at a theoretical level. After defining some fundamental parameters of antennas, there is an analysis of finite length dipole. It is followed by the theory of antenna arrays and means of input impedance calculation of antenna array elements. In the final part of the work, a program is designed on the basis of the theory. The program is MATLAB based and implements the above mentioned calculations.

19. Technický výpočet záření soustav lineárních antén

Author

Pokorný, Michal, Puskely, Jan, Pokorný, Michal, and Puskely, Jan

Abstract

Tato práce se zabývá výpočtem směrových charakteristik a vstupních impedancí anténních soustav. V první části je tato problematika řešena na teoretické úrovni. Po definici základních parametrů antén je proveden rozbor vlastností dipólu konečné délky jako základního prvku anténních soustav. Poté následuje teorie anténních soustav a metody výpočtu vstupních impedancí dílčích prvků. Na základě těchto poznatků je pak vytvořen program v prostředí MATLAB, který realizuje zmíněné výpočty pro obecnou anténní soustavu., This project deals with methods of calculation of radiation patterns and input impedances of antenna arrays. The first part describes this issue at a theoretical level. After defining some fundamental parameters of antennas, there is an analysis of finite length dipole. It is followed by the theory of antenna arrays and means of input impedance calculation of antenna array elements. In the final part of the work, a program is designed on the basis of the theory. The program is MATLAB based and implements the above mentioned calculations.

20. Technický výpočet záření soustav lineárních antén

Author

Pokorný, Michal, Puskely, Jan, Pokorný, Michal, and Puskely, Jan

Abstract

Tato práce se zabývá výpočtem směrových charakteristik a vstupních impedancí anténních soustav. V první části je tato problematika řešena na teoretické úrovni. Po definici základních parametrů antén je proveden rozbor vlastností dipólu konečné délky jako základního prvku anténních soustav. Poté následuje teorie anténních soustav a metody výpočtu vstupních impedancí dílčích prvků. Na základě těchto poznatků je pak vytvořen program v prostředí MATLAB, který realizuje zmíněné výpočty pro obecnou anténní soustavu., This project deals with methods of calculation of radiation patterns and input impedances of antenna arrays. The first part describes this issue at a theoretical level. After defining some fundamental parameters of antennas, there is an analysis of finite length dipole. It is followed by the theory of antenna arrays and means of input impedance calculation of antenna array elements. In the final part of the work, a program is designed on the basis of the theory. The program is MATLAB based and implements the above mentioned calculations.

21. Technický výpočet záření soustav lineárních antén

Author

Pokorný, Michal, Puskely, Jan, Halm, Martin, Pokorný, Michal, Puskely, Jan, and Halm, Martin

Abstract

Tato práce se zabývá výpočtem směrových charakteristik a vstupních impedancí anténních soustav. V první části je tato problematika řešena na teoretické úrovni. Po definici základních parametrů antén je proveden rozbor vlastností dipólu konečné délky jako základního prvku anténních soustav. Poté následuje teorie anténních soustav a metody výpočtu vstupních impedancí dílčích prvků. Na základě těchto poznatků je pak vytvořen program v prostředí MATLAB, který realizuje zmíněné výpočty pro obecnou anténní soustavu., This project deals with methods of calculation of radiation patterns and input impedances of antenna arrays. The first part describes this issue at a theoretical level. After defining some fundamental parameters of antennas, there is an analysis of finite length dipole. It is followed by the theory of antenna arrays and means of input impedance calculation of antenna array elements. In the final part of the work, a program is designed on the basis of the theory. The program is MATLAB based and implements the above mentioned calculations.

22. Diagnostics dans les plasmas de densité et température électroniques faibles par mesure d'impédance mutuelle (sonde quadripolaire) et d'impédance propre (dipôle double sphère)

Author

R. Debrie, P.M.E. Decreau, Laboratoire de physique et chimie de l'environnement (LPCE), Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), CRPE Université d'Orléans, and Université d'Orléans (UO)

Subjects
Physics, double sphere dipole probe, linear configurations, plasma diagnostics, electron temperature, plasma probes, isotropic simulation plasma, 01 natural sciences, complex mutual impedance, 010305 fluids & plasmas, [PHYS.HIST]Physics [physics]/Physics archives, 0103 physical sciences, self impedance, quadrupole probes, electron density, 010303 astronomy & astrophysics, square configurations
Abstract

Nous avons mesuré, dans un plasma de simulation isotrope, l'impédance mutuelle complexe de sondes quadripolaires à configuration carrée ou linéaire, ainsi que l'admittance propre d'une sonde formée d'un dipôle double sphère. Chacun de ces systèmes donne accès à une ou plusieurs déterminations de la densité et de la température électronique, que nous avons pu comparer entre elles.

Published
1977
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23. Definition and computation of carson formulas

Author

Krolo, I., Modrić, T., Slavko Vujevic, Perković, Toni, Milanović, Željka, Vukojević, Katarina, Rodriguez, Joel J. P. C., Nižetić, Sandro, Patrono, Luigi, and Šolić, Petar

Subjects
Numerical algorithm, Carson formulas, self impedance, mutual impedance, piecewise linear approximation
Abstract

In this paper, a new numerical algorithm for high-accurate computation of exact Carson formulas is developed. Carson formulas are used for computing of per-unit-length (pul) self and mutual impedances of infinitely long parallel conductors. The proposed algorithm is based on piecewise linear approximation of kernel function and analytical integrations of piecewise-linearized kernel function multiplied by the rest of two integrands. Using proposed numerical algorithm, high-accurate results with desired n-digit accuracy can be easily obtained. Results computed by two approximation methods are compared with high-accurate results computed by proposed numerical algorithm for power frequency.

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