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IEEE Microwave and Guided Wave Letters
Volume 10 Number 5, May 2000

Table of Contents for this issue

Complete paper in PDF format

Circuit Model for Coplanar-Slotline Tees

Miquel Ribó, Associate Member, IEEE and Lluís Pradell Member, IEEE

Page 177.

Abstract:

Coplanar-slotline tees have been used in a number of microwave circuits, although no complete models were available to explain their behavior. In this letter, a new"circuit-model"for a coplanar-slotline tee is presented. The model, based on the separation of coplanar waveguide (CPW) even and odd modes into two different ports, explains the tee's behavior even if CPW air bridges are not used and slotlines are loaded asymmetrically. The new model has been applied to the analysis of the input reflection coefficient of an offset-fed slotline antenna, showing an excellent agreement between simulation and measurement.

References

  1. J. Schoenberg, T. Mader, B. Shaw and Z. B. Popovic, "Quasioptical antenna array amplifiers", in IEEE Microwave Theory Tech. Symp. Dig., 1995, pp.  605-608. 
  2. S. Raman and G. M. Rebeiz, "Single-and dual-polarized slot-ring subharmonic receivers", in IEEE Microwave Theory Tech. Symp. Dig., vol. 2, 1997, pp.  565-568. 
  3. A. Nesic, "Endfire slotline antennas excited by a coplanar waveguide", in IEEE Antennas and Propagation Society Int. Symp. Dig., 1991, pp.  700-702. 
  4. S. Labonté and W. J. R. Hoefer, "Analysis and optimization of E -plane directional couplers", in IEEE Microwave Theory Tech. Symp. Dig., 1988, pp.  721-724. 
  5. P.-C. Hsu, C. Nguyen and M. Kintis, "Uniplanar broad-band push-pull FET amplifiers", IEEE Trans. Microwave Theory Tech., vol. 45, pp.  2150-2152, 1997.
  6. C.-Y. Lee, Y. Liu and T. Itoh, "The effects of the coupled slotline mode and air-bridges on CPW and NLC waveguide discontinuities", IEEE Trans. Microwave Theory Tech., vol. 43, pp.  2759-2765, 1995.