2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

IEEE Transactions on Microwave Theory and Techniques
Volume 48 Number 12, December 2000

Table of Contents for this issue

Complete paper in PDF format

Direct Synthesis of Microwave Filters Using Inverse Scattering Transmission-Line Matrix Method

Renato de Pádua Moreira, Student Member, IEEE and Leonardo R. A. X. de Menezes Member, IEEE

Page 2271.

Abstract:

This paper proposes a new design procedure for planar microwave filters based on the inversion of the one-dimensional transmission-line matrix (TLM) method. The essence of the technique is the solution of the inverse scattering problem using a TLM-based algorithm instead of using equivalent circuits. The procedure consists of determining the geometry of the obstacle that generates the desired scattered field. In the case of filters, this field is the time-domain input reflection coefficient, and the geometry is the impedance profile of the filter. The procedure was validated with the design of low-pass and bandstop filters. It can be used to create filters with arbitrary characteristics.

References

  1. P. P. Roberts and G. E. Town, "Design of microwave filters by inverse scattering", IEEE Trans. Microwave Theory and Tech., vol. 43, no. 4, pp.  739-743, 1995.
  2. M. LeRoy, A. Pérennec, S. Toutain and L. C. Calvez, "The continuously varying transmission-line technique-Application to filter design", IEEE Trans. Microwave Theory Tech., vol. 47, no. 9, pp.  1680-1687, Sept.  1999.
  3. T. J. Cui, C. H. Liang and W. Wiesbeck, "Closed-form solutions for one-dimensional inhomogeneous anisotropic medium in a special case-Part I: Direct scattering problem", IEEE Trans. Antennas Propagat., vol. 45, pp.  936-941, 1997.
  4. T. J. Cui, C. H. Liang and W. Wiesbeck, "Closed-form solutions for one-dimensional inhomogeneous anisotropic medium in a special case-Part II: Inverse scattering problem", IEEE Trans. Antennas Propagat., vol. 45, pp.  941-947,  1997.
  5. T. J. Cui and C. H. Liang, "Nonlinear differential equations for reflection coefficient of an inhomogeneous lossy medium and its inverse scattering solutions", IEEE Trans. Antennas Propagat., vol. 42, pp.  621-626, 1994.
  6. W. J. R. Hoefer, "The transmission-line matrix method-Theory and applications", IEEE Trans. Microwave Theory Tech., vol. MTT-33, pp.  882-893, Oct.  1985.
  7. C. Christopoulos, The Transmission Line Modeling Method TLM, Piscataway, NJ: IEEE Press, 1995.