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Criteria and quality assessment of the matching of loads in the band-pass of polynomial LC-filter

DOI 10.18127/j00338486-201909(13)-03


V.P. Smirnov – Ph.D.(Eng.), Associate Professor, Engineer, Israel

In the theory of impedances matching, it could not find a formulation for criterion of the occurrence of the maximum possible (complete) loads matching and for an assessment of the quality of loads matching in the filter band-pass. In this regard, it is advisable to classify the states of the loads matching in the band-pass of polynomial Butterworth and Chebyshev filters. It was proposed, based on peculiarities of shape of the transducer power gain   frequency response, to name the state of a complete matching of loads as «matching on-maximum» and also to perform an estimation of a quality of matching through of an average value of this function in the band-pass. The same features of this function make it possible to calling the states of the «matching on-maximum» (MOM) at the band-pass points as «matching on-points» (MOP). As a result of studying the conditions for an occurrence of «matching on-points» of loads in some filters, represented by the parameters in standard prototype tables, inaccuracies were found, for which were given an explanations of their origin and elimination. Little-known parametric conditions for the occurrence of the MOP, are described for polynomial band-passed filter circuits that are performed on the basis of LC resonant sections (RS) and also of the non-resonant sections (NRS), low-frequency type LC and high-frequency type CL. The accumulated experience confirms the practical value of the proposed concepts and definitions when analyzing the process and assessing the quality of loads matching in the band-passed filter-transformers.

  1. Alan Davis W., Agarval K.K. Radio Frequency Circuit Design. Ch. 5. Wiley. 2001.
  2. Les Besser, Rowan Gilmor Practical RF Cicuit Design for Modern Wireless Systems: V. 1. Passive Circuits and Systems. Ch. 8. Boston–London: Artech House, Inc. 2003.
  3. White J.F. High Frequency Techniques. Ch. 2 & 3. Wiley. 2004.
  4. Abrie P.L.D. The Design of RF and Microwave Amplifiers and Oscillators. Ch. 8. Boston: Artech House, Inc. 1999.
  5. Bogachev V.M. Coupling circuits synthesis for broadband amplifiers (in Russian). Ch. 3. M.: MEI. 1980. P. 100.
  6. Matthaei G.L., Young L. and Jones E.M.T. Microwave Filters, Impedance Matching Networks, and Coupling Structures. N-Y: McGraw-Hill 1964. Also, Artech House. 1980. Ch. 1 & 4.
  7. Pozar D.M. Microwave engineering. Ch. 8. 3rd ed. Wiley. 2005.
  8. Chris Bowick RF circuits Design. Ch. 3. Woburn, MA, Newnes. 1982.
  9. Williams A.B., Taylor F.J. Electronic Filter Design Handbook. 4th ed. Ch. 3 & 11. N-Y: McGraw-Hill. 2006.
  10. AWR Design Environment 9.0 Manual: Measurements. User Guide. Applied Wave Research, Inc. 2005.
  11. Chen W.K. Passive and Active Filters, Theory and Implementation. Ch. 4. N-Y: Wiley. 1986.
  12. Matthaei G.L. Tables of Chebyshev Impedance-Transforming Networks of Low-Pass Filter Form. Proc. of the IEEE. August 1964. P. 939−963.
  13. Zverev A.I. Handbook of Filter Synthesis. N-Y: Wiley. 1967.
  14. Weinberg L. Network Analysis and Synthesis. N-Y: McGraw Hill. 1962.
  15. Saal R. Handbuch Zum Filterenwurf. Sec. 3.2, 8.2.3 (in Russian). M.: Radio and Communications. 1983.
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