Browse > Article
http://dx.doi.org/10.5515/KJKIEES.2007.18.8.895

Perfectly-Matched DC Blocks Terminated in Arbitrary Impedances  

Ahn, Hee-Ran (Dept. of Electronics and Electrical Engineering, Pohang University of Science and Technology(POSTECH))
Kim, Bum-Man (Dept. of Electronics and Electrical Engineering, Pohang University of Science and Technology(POSTECH))
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.18, no.8, 2007 , pp. 895-903 More about this Journal
Abstract
Design equations of DC blocks terminated in arbitrary impedances are newly suggested and a microstrip DC block is tested for the perfect matching. The DC block is a two-port passive component and the power excited at a port is transmitted into another port. However, all the excited power at the input can not be delivered to the output and therefore most of the conventional DC blocks can not be perfectly matched with arbitrary termination impedances. To solve the matching problem, its one-port equivalent resonant circuit model, front which design equations can be derived, is newly suggested. Using the derived design equations, any DC block can be designed, perfectly matched without any restriction of coupling coefficients. To verify the derived design equations, measurements were carried out and the results are in good agreement with prediction, showing insertion and return losses at 4.1 GHz are 0.82dB and -31dB, respectively.
Keywords
DC Blocks Terminated in Arbitrary Impedances; Impedance-Transforming Directional Couplers; Equivalent Resonant Circuit Model of DC Blocks; Impedance-Transforming DC Blocks;
Citations & Related Records
연도 인용수 순위
  • Reference
1 E. M. T. Jones, J. T. Bolljahn, 'Coupled-strip-transmission-line filters and directional couplers', IRE Trans. Microwave Theory Tech., vol. MTT-4, pp. 75-81, Apr. 1956
2 J. P. Shelton, J. A. Mosko, 'Synthesis and design of wideband equal ripple TEM directional couplers and fixed phase shifters', IEEE Trans. Microwave Theory Tech., vol. MTT-14, pp. 462-473, Oct. 1966
3 U. H. Gysel, 'New theory and design for hairpin- line filters', IEEE Trans. Microwave Theory Tech., vol. MTT-22, pp. 523-531, May 1974
4 H. -R. Ahn, I. Wolff, 'General design equations of three-port power dividers, small-sized impedance transformers, and their applications to small-sized three-port 3-dB power dividers', IEEE Trans. Microwave Theory Tech., vol. 49, pp. 1277-1288, Jul. 2001   DOI   ScienceOn
5 H. -R. Ahn, Asymmetric Passive Components in Microwave Integrated Circuits, New York, John Wiley & Sons, Inc., p. 18, pp. 38-40, Aug. 2006
6 H. -R. Ahn, I. Wolff, 'Asymmetric four-port and branch-line hybrids', IEEE Trans. Microwave Theory Tech., vol. 48, pp. 1585-1588, Sep. 2000   DOI   ScienceOn
7 G. I. Zysman, A. K. Johnson, 'Coupled transmission line networks in an inhomogeneous dielectric medium', IEEE Trans. Microwave Theory Tech., vol. MTT-17, pp. 753-759, Oct. 1969
8 S. B. Cohn, 'Parallel-coupled transmission line resonators', IRE Trans. Microwave Theory Tech., vol. MTT-6, pp. 223-231, Apr. 1958
9 K. D. Marx, 'Propagation modes equivalent circuits, and characteristic terminations for multiconductor transmission lines with inhomogeneous dielectrics', IEEE Trans. Microwave Theory Tech., vol. MTT- 21, pp. 450-457, Jul. 1973
10 H. -R. Ahn, I. Wolff, and I. -S. Chang, 'Arbitrary termination impedances, arbitrary power division and small-sized ring hybrids', IEEE Trans. Microwave Theory Tech., vol. 44, pp. 2241-2247, Dec. 1997
11 V. J. Tripathi, 'Asymmetric coupled transmission lines in an inhomogeneous medium', IEEE Trans. Microwave Theory Tech., vol. MTT-23, pp. 734- 739, Sep. 1975
12 H. -R. Ahn, I. Wolff, 'Asymmetric ring hybrid phase-shifters and attenuators', IEEE Trans. Microwave Theory Tech., vol. 50, pp. 1146-1155, Apr. 2002   DOI   ScienceOn
13 D. F. Williams, L. A. Hayden, and R. B. Marks 'A complete multimode equivalent-circuit theory for electrical design', NIST Journal Research, vol. 102, pp. 405-423, Jul.-Aug., 1997   DOI   ScienceOn
14 H. -R. Ahn, Resonators, in Encyclopedia of RF and Microwave Engineering, Wiley, 2005
15 G. L. Matthaei, 'Interdigital bandpass filters', IRE Trans. Microwave Theory Tech., vol. MTT-10, pp. 479-491, Nov. 1962
16 R. Levy, 'General synthesis of asymmetric multi- element coupled transmission line directional couplers', IEEE Trans. Microwave Theory Tech., vol. MTT-11, pp. 227-231, Jul. 1963
17 M. K. Krage, G. I. Haddad, 'Characteristics of coupled microstrip transmission lines-I: Coupled- mode formulation of inhomogeneous lines', IEEE Trans. Microwave Theory Tech., vol. MTT-18, pp. 217-222, Apr. 1970
18 H. -R. Ahn, I. Wolff, 'Three-port 3-dB power divider terminated by different impedances and its application to MMIC's', IEEE Trans. Microwave Theory Tech., vol. 47, pp. 786-794, Jun. 1999   DOI   ScienceOn
19 H. -R. Ahn, I. -S. Chang, and S. -W. Yun, 'Miniaturized 3-dB ring hybrid terminated by arbitrary impedances', IEEE Trans. Microwave Theory Tech., vol. 42, pp. 2216-2221, Dec. 1994   DOI   ScienceOn
20 R. Mongia, I, Bahl, and P. Bhartia, RF and Microwave Coupled-line Circuits, Boston, Artech House Inc., p. 183, 190, 366, 1999
21 H. -R. Ahn, B. Kim, 'Transmission-line directional couplers for impedance transforming', IEEE Microwave and Wireless Components Letters, pp. 537-539, Oct. 2006
22 D. Kajfez, B. S. Vidula, 'Design equations for symmetric microstrip DC blocks', IEEE MTT, vol. MTT-28, no. 9, pp. 974-981, 1980
23 S. B. Cohn, R. Levy, 'History of microwave passive components with particular attention to directional couplers', IEEE Trans. Microwave Theory Tech., vol. MTT-32, pp. 1046-1054, Sep. 1984