The Experts below are selected from a list of 6060 Experts worldwide ranked by ideXlab platform

W. Heinrich - One of the best experts on this subject based on the ideXlab platform.

Christopher L. Holloway - One of the best experts on this subject based on the ideXlab platform.

  • Expressions for the Conductor Loss of strip‐line and coplanar‐strip (CPS) structures
    Microwave and Optical Technology Letters, 2000
    Co-Authors: Christopher L. Holloway
    Abstract:

    In this paper, we present closed-form expressions for the attenuation constant due to Conductor Loss for strip-line and coplanar-strip (CPS) structures. These expressions are functions of a universal parameter referred to as the stopping distance, where it is shown that this stopping distance is a function only of the local edge geometry, i.e., the strip thickness, the shape of the edge, and the material of the strip Conductor. We also present an expression for the current distribution of the ground planes of a strip-line structure, which is used to derive an expression for the Conductor Loss of the ground planes. Results obtained with these Loss expressions are compared to, and closely agree with, both experimental results and full-numerical results found in the literature for these two structures. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 25: 162–168, 2000.

  • expressions for the Conductor Loss of strip line and coplanar strip cps structures
    Microwave and Optical Technology Letters, 2000
    Co-Authors: Christopher L. Holloway
    Abstract:

    In this paper, we present closed-form expressions for the attenuation constant due to Conductor Loss for strip-line and coplanar-strip (CPS) structures. These expressions are functions of a universal parameter referred to as the stopping distance, where it is shown that this stopping distance is a function only of the local edge geometry, i.e., the strip thickness, the shape of the edge, and the material of the strip Conductor. We also present an expression for the current distribution of the ground planes of a strip-line structure, which is used to derive an expression for the Conductor Loss of the ground planes. Results obtained with these Loss expressions are compared to, and closely agree with, both experimental results and full-numerical results found in the literature for these two structures. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 25: 162–168, 2000.

  • Internal inductance and Conductor Loss associated with the ground plane of a microstrip line
    IEEE Transactions on Electromagnetic Compatibility, 1997
    Co-Authors: Christopher L. Holloway, G.a. Hufford
    Abstract:

    In previous work, a closed-form expression for the current density on the ground plane of a microstrip line was presented. In this paper, we show how this formula for the current density is used to derive an expression for the internal inductance associated with the ground plane. Results are presented for different geometries that illustrate when the internal inductance of the ground becomes comparable to the external inductance of the microstrip line. We also illustrate that the integrals needed for the internal inductance calculation can be used to develop an expression for the Conductor Loss associated with the ground plane.

  • A quasi-closed form expression for the Conductor Loss of CPW lines, with an investigation of edge shape effects
    IEEE Transactions on Microwave Theory and Techniques, 1995
    Co-Authors: Christopher L. Holloway, Edward F. Kuester
    Abstract:

    In previous work, we used a matched asymptotic technique to investigate the fields near an edge of a finitely conducting strip with nonzero thickness. It was demonstrated that with this asymptotic solution of the fields, the power Loss in the region local to the edge could be determined accurately. In this paper, we will show how the accurate representation of the power Loss can be used to obtain a closed form expression for the attenuation constant due to Conductor Loss of coplanar waveguide (CPW) structures. This expression is valid for an arbitrarily shaped edge and any Conductor thickness. Results obtained with this expression are compared to and closely agree with both experimental results and other techniques found in the literature. We also investigated Conductors with different edge shapes (45/spl deg/ and 90/spl deg/ edges) to explore their effect on the attenuation constant (or Loss) of CPW structures.

  • edge shape effects and quasi closed form expressions for the Conductor Loss of microstrip lines
    Radio Science, 1994
    Co-Authors: Christopher L. Holloway, Edward F. Kuester
    Abstract:

    Much work has been done in the past to determine the Conductor Loss of microwave and millimeter-wave integrated circuits (MIMICs). However, much of this work is limited by constraints on the Conductor thickness, skin depth, or the shape of the edge. In this paper, a technique will be presented that results virtually in a quasi-closed form expression for this Loss in many cases. This expression will allow the calculation of the attenuation constant for a planar circuit for an arbitrarily shaped edge and any Conductor thickness. The question of how different edge shapes affect the Conductor Loss will be addressed.

C.l. Holloway - One of the best experts on this subject based on the ideXlab platform.

  • Conductor Loss in superconducting planar structures: calculations and measurements
    IEEE Transactions on Microwave Theory and Techniques, 1999
    Co-Authors: J.c. Booth, C.l. Holloway
    Abstract:

    We present closed-form expressions of the attenuation constant due to Conductor Loss for superconducting coplanar waveguide and microstrip transmission lines. These expressions, valid for arbitrary Conductor thickness, make use of a numerically determined quantity (the stopping distance /spl Delta/) that depends on the material properties and edge shape of the superconducting transmission line. Once /spl Delta/ is determined, the attenuation constant for any planar geometry can be obtained without further numerical calculation, making this technique attractive for use in the design of circuits incorporating superconducting planar elements. The results of this calculation compare favorably with full numerical calculations and also with experimental data on high-temperature superconducting coplanar transmission lines, illustrating the accuracy and applicability of the calculation for determining the Conductor Loss of superconducting circuit elements.

J.c. Booth - One of the best experts on this subject based on the ideXlab platform.

  • Conductor Loss in superconducting planar structures: calculations and measurements
    IEEE Transactions on Microwave Theory and Techniques, 1999
    Co-Authors: J.c. Booth, C.l. Holloway
    Abstract:

    We present closed-form expressions of the attenuation constant due to Conductor Loss for superconducting coplanar waveguide and microstrip transmission lines. These expressions, valid for arbitrary Conductor thickness, make use of a numerically determined quantity (the stopping distance /spl Delta/) that depends on the material properties and edge shape of the superconducting transmission line. Once /spl Delta/ is determined, the attenuation constant for any planar geometry can be obtained without further numerical calculation, making this technique attractive for use in the design of circuits incorporating superconducting planar elements. The results of this calculation compare favorably with full numerical calculations and also with experimental data on high-temperature superconducting coplanar transmission lines, illustrating the accuracy and applicability of the calculation for determining the Conductor Loss of superconducting circuit elements.

Tatsuo Itoh - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of the superconducting coplanar waveguide by combining spectral domain method and phenomenological equivalence method
    Electronics Letters, 1990
    Co-Authors: K. S. Kong, C.w. Kuo, T. Kitazawa, Tatsuo Itoh
    Abstract:

    A Conductor Loss of the high T c superconducting coplanar waveguide (CPW) is calculated by combining the spectral domain method (SDM) and the phenomenological equivalence method (PEM). An inductance of CPW is calculated by the SDM and the geometric factor is then calculated by using a numerical derivative of the inductance. This calculated geometric factor of the CPW is used in the PEM to calculate the Conductor Loss. Owing to the combination of the accurate analysis of CPW by SDM and PEM, the merits of two methods are obtained, which are : better accuracy, simple and fast calculation, and applicability to any case of penetration depth compared with the Conductor thickness

  • Analysis of the Superconducting Coplanar Waveguide
    20th European Microwave Conference 1990, 1990
    Co-Authors: K. S. Kong, H. Y. Lee, Tatsuo Itoh
    Abstract:

    This paper presents a Conductor Loss calculation of the high Tc superconducting coplanar waveguide (CPW) by using Phenomenological Equivalence Method (PEM) and two fluid model. In this method, the equivalent strip line is obtained by calculating the equivalent width and thickness of CPW by considering the field penetration into the center Conductor and ground plane of the CPW. Then, the Conductor Loss of CPW is calculated from the equivalent strip line. The theoretically calculted Q values are compared with the experimental results available. It is observed that the effect of the substrate Loss becomes critical in superconducting coplanar waveguide because of the reduced Conductor Loss.

  • Loss reduction in superconducting microstrip-like transmission lines
    1988. IEEE MTT-S International Microwave Symposium Digest, 1
    Co-Authors: Brian Young, Tatsuo Itoh
    Abstract:

    A mode-matching analysis is applied to microstrip-like transmission lines to determine the dielectric and Conductor Loss. In microstrip using normal metals and typical low-Loss dielectrics, the Conductor Loss dominates the dielectric Loss. For microstrip using superConductors, the dielectric Loss is shown to be dominant. Further reductions in overall Loss must come in the dielectric Loss. Superconducting suspended substrate and ridged microstrip are analyzed to determine the dielectric-Loss reduction available and the effect of the reductions on the Conductor Loss. Cu and YBaCuO are used as Conductor materials in the analysis. >