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 3, March 2000

Table of Contents for this issue

Complete paper in PDF format

Design and Modeling of Twin-Spiral Coplanar-Waveguide-to-Slotline Transitions

Yo-Shen Lin and Chun Hsiung Chen

Page 463.

Abstract:

A novel reduced-size twin-spiral coplanar-waveguide-to-slotline transition is proposed in this paper. This twin-spiral transition is based on a modification of quarter-wavelength transformer structure. For design purpose, a hybrid equivalent-circuit model of combining transmission-line theory and full-wave simulation is established. Based on this model, various twin-spiral transition structures are carefully examined theoretically and experimentally. Specifically, a twin-spiral transition with 2.26: 1 bandwidth and one-quarter the size of conventional ones is achieved. Being simple in fabrication and small in size, the proposed twin-spiral coplanar-waveguide-to-slotline transition is a useful component in uniplanar microwave integrated circuit/monolithic-microwave integrated-circuit applications.

References

  1. K. C. Gupta, R. Garg and I. J. Bahl, Microstrip Lines and Slotlines, 2nd ed.   Norwood, MA: Artech House, 1996, ch. 5 and 7.
  2. T. Hirota, Y. Tarusawa and H. Ogawa,"Uniplanar MMIC hybrids-A proposed new MMIC structure", IEEE Trans. Microwave Theory Tech., vol. MTT-35 , pp.  576-581, June  1987.
  3. H. Ogawa and A. Minagawa,"Uniplanar MIC balanced multiplier-A proposed new structure for MIC's", IEEE Trans. Microwave Theory Tech., vol. MTT-35, pp.  1363-1368, Dec.  1987.
  4. C.-H. Ho, L. Fan and K. Chang,"Broad-band uniplanar hybrid-ring and branch-line couplers", IEEE Trans. Microwave Theory Tech., vol. 41, pp.  2116-2125, Dec.  1993.
  5. L. Fan, C.-H. Ho, S. Kanamaluru and K. Chang,"Wide-band reduced-size uniplanar magic-T, hybrid-ring and de Ronde's CPW-slot couplers", IEEE Trans. Microwave Theory Tech., vol. 43, pp.  2749-2758 , Dec.  1995.
  6. C.-H. Ho, L. Fan and K. Chang,"Experimental investigations of CPW-slotline transitions for uniplanar microwave integrated circuits", IEEE MTT-S Int. Microwave Symp. Dig., pp.  877-880, 1993.
  7. W. Grammer and K. S. Yngvesson,"Coplanar waveguide transitions to slotline: Design and microprobe characterization", IEEE Trans. Microwave Theory Tech., vol. 41, pp.  1653-1658 , Sept.  1993.
  8. V. Trifunovic and B. Joknaovic,"Review of printed Marchand and double Y baluns: Characteristics and application", IEEE Trans. Microwave Theory Tech., vol. 42, pp.  1454-1462 , Aug.  1994.
  9. K. Hettak, J. P. Coupez, T. L. Gouguec, S. Toutain, P. Legaud and E. Penard, "Improved CPW to slotline transitions", IEEE MTT-S Int. Microwave Symp. Dig., pp.  1831-1834, 1996.
  10. V. Trifunovic and B. Joknaovic,"New uniplanar balun", Electron. Lett., vol. 28, no. 10, pp.  813-815, May  1991.
  11. T. Q. Ho and S. M. Hart,"A broad-band coplanar waveguide to slotline transition", IEEE Microwave Guided Wave Lett., vol. 2, pp.  415-416, Oct.  1992.
  12. C. Veyres and V. F. Hanna,"Extension of the application of conformal mapping techniques to coplanar lines with finite dimensions", Int. J. Electron. , vol. 48, no. 1, pp.  47-56, July  1980.
  13. R. Janaswamy and D. H. Schaubert,"Characteristic impedance of a wide slotline on low-permittivity substrate", IEEE Trans. Microwave Theory Tech., vol. MTT-34, pp.  900-902, Aug.  1986.
  14. T. Itoh,"Spectral domain immittance approach for dispersion characteristics of generalized printed transmission lines", IEEE Trans. Microwave Theory Tech., vol. MTT-28, pp.  733-736, July   1980.
  15. K. Sarkar, Z. A. Maricevic and M. Kahrizi,"An accurate de-embedding procedure for characterizing discontinuities", Int. J. Microwave Millimeter-Wave Computer-Aided Eng. , vol. 2, no. 3, pp.  135-143, Mar.  1992.
  16. F. L. Lin, C. W. Chiu and R. B. Wu,"Coplanar waveguide bandpass filter-A ribbon of brick wall design", IEEE Trans. Microwave Theory Tech., vol. 43 , pp.  1589-1596, July  1995.