Advertisement

Spectral-Domain Modeling of Radiation and Guided Wave Leakage in a Printed Transmission Line

  • Nirod K. Das
Chapter

Abstract

The dominant mode of an infinite transmission line printed on a layered substrate and/or ground plane configuration can be lossy due to coupling of power to radiation or to source free guided modes of the layered structure [1–3]. Such ‘non-conventional’ lossy modes of a printed transmission line are undesirable for an integrated circuit application. However, these modes can sometimes be inevitably excited for certain specific layered configurations at all frequencies, or only at higher frequencies for certain other geometries. Similar lossy modes can also occur for higher order modes of printed transmission lines which are otherwise dominantly non-leaky (bound) [4]. Unlike the dominant mode of a conventional transmission line (a regular microstrip line, for example) where the field is bound to the guiding structure, for these leaky modes the field profile of the infinite transmission line has been found to behave in a non-standard way by growing exponentially in transverse directions [3]. For such growing behavior, the Fourier transforms for various field components in the transverse dimension do not exist for real values of the spectral argument. Hence, the standard spectral-domain formulations [5–7], where existence of Fourier transform on the real axis is assumed, can not be directly used to characterize this class of leaky modes of printed transmission lines.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    H. Sigesawa, M. Tsuji and A. A. Oliner, “Conductor Backed Slotline and Coplanar Waveguide: Dangers and Full-Wave Analysis,” IEEE MTT-S Digest, pp. 199–202, 1988.Google Scholar
  2. [2]
    D. B. Rutledge, D. P. Neikirk and D. P. Kasilingam, “Planar Integrated Circuit Antennas,” Chapter 1, Vol. 10, Millimeter Components and Techniques, Part II of Infrared and Millimeter Waves, K. J. Button, Editor.Google Scholar
  3. [3]
    N. K. Das and D. M. Pozar, “Full-Wave Spectral-Domain Computation of Material, Radiation and Guided Wave Losses in Infinite Multilayred Printed Transmission Lines,” IEEE Transactions on Microwave Theory and Techniques, January 1991, to appear.Google Scholar
  4. [4]
    A. A. Oliner and K. S. Lee, “The Nature of the Leakage from Higher Modes on Microstrip Line,” IEEE Microwave Theory and Techniques Society Symposium Digest, pp. 57–66, 1986.Google Scholar
  5. [5]
    E. J. Denlinger, “A Frequency Dependent Solution for Microstrip Transmission Lines,” IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-19, pp. 30–39, January 1971.Google Scholar
  6. [6]
    T. Itoh and R. Mittra, “Spectral Domain Approach for Calculatingthe Dispersion Characteristics of Microstrip Lines,” IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-21, pp. 496–499, July 1973.ADSCrossRefGoogle Scholar
  7. [7]
    J. B. Davies and Mirshekar-Syahkal. “Spectral Domain Solution of Arbitrary Transmission Line With Multilayer Substrate,” IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-25, pp. 143–146, February 1977.ADSCrossRefGoogle Scholar
  8. [8]
    N. K. Das and D. M. Pozar, “Generalized Spectral-Domain Green’s Function for Multilayer Dielectric Substrates with Applications to Multilayer Transmission Lines,” IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-35, pp. 326–335, March 1987.ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • Nirod K. Das
    • 1
  1. 1.Weber Research InstitutePolytechnic UniversityFarmingdaleUSA

Personalised recommendations