Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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By T. Shen and K. A. Zaki

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Length reduction of evanescent-mode ridge waveguide bandpass filters is investigated extensively. Based on the conventional filter configuration, two new filter configurations are proposed: one is the generalized filter, and the other is the folded filter. In the generalized filter configuration, the cross sections of the evanescent waveguide and the ridge waveguide are not necessarily the same. It is found that the filter length can be reduced by enlarging the evanescent waveguide height. In the folded filter configuration, the filter is folded back at the middle coupling section. The folded junction is ridged to provide the required coupling between the two ridge waveguide resonators it connects. A design example demonstrates the feasibility of this filter configuration.

Citation: (See works that cites this article)
T. Shen and K. A. Zaki, "Length Reduction of Evanescent-Mode Ridge Waveguide Bandpass Filters," Progress In Electromagnetics Research, Vol. 40, 71-90, 2003.

1. Cohn, S. B., "Properties of ridge waveguide," Proc. IRE, Vol. 35, 783-788, Aug. 1947.

2. Hopfer, S., "The design of ridged waveguides," IRE Trans. Microwave Theory Tech., Vol. 5, 20-29, Oct. 1955.

3. Saad, A. M. K., "A unified ridge structure for evanescentmode wideband harmonic filters: analysis and applications," 17th European Microwave Conf. Proc., 157-162, Rome, Italy, 1987.

4. Saad, A. M. K., "Novel lowpass harmonic filters for satellite application," IEEE MTT-SInt. Microwave Symp. Dig., 292-294, San Francisco, CA, May 1984.

5. Saad, A. M. K., J. D. Miller, A. Mitha, and R. Brown, "Analysis of antipodal ridge waveguide structure and application on extremely wide stopband lowpass filter," IEEE MTT-SInt. Microwave Symp. Dig., 361-363, Baltimore, MD, June 1986.

6. Saad, A. M. K., A. Mitha, and R. Brown, "Evanescent mode-serrated ridge waveguide bandpass harmonic filters," 16th European Microwave Conf. Proc., 287-291.

7. Gipprich, J., D. Stevens, M. Hageman, A. Piloto, K. A. Zaki, and Y. Rong, "Embedded waveguide filters for microwave and wireless applications using cofired ceramic technologies," Proc. Int. Symp. Microelectron., 23, San Diego, CA, Nov. 1998.

8. Rong, Y., K. A. Zaki, M. Hageman, D. Stevens, and J. Gipprich, "Low-temperature cofired ceramic (LTCC) ridge waveguide bandpass chip filters," IEEE Trans. Microwave Theory Tech., Vol. 47, 2317-2324, Dec. 1999.

9. Wang, C. and K. A. Zaki, "Full-wave modeling of generalized double ridge waveguide T-junctions," IEEE Trans. Microwave Theory Tech., Vol. 44, 2536-2542, Dec. 1996.

10. Yao, H.-W., A. E. Abdelmonem, J.-F. Liang, X.-P. Liang, K. A. Zaki, and A. Martin, "Wide-band waveguide and ridge waveguide T-junctions for diplexer applications," IEEE Trans. Microwave Theory Tech., Vol. 41, 2166-2173, Dec. 1993.

11. Pyle, J. R., "The cutoff wavelength of the TE10 mode in ridged rectangular waveguide of any aspect ratio," IEEE Trans. Microwave Theory Tech., Vol. 14, 175-183, Apr. 1966.

12. Craven, G. F. and C. K. Mok, "The design of evanescent mode waveguide bandpass filters for a prescribed insertion loss characteristics," IEEE Trans. Microwave Theory Tech., Vol. 19, 295-308, Mar. 1971.

13. Synder, R. V., "New application of evanescent mode waveguide to filter design," IEEE Trans. Microwave Theory Tech., Vol. 25, 1013-1021, Dec. 1977.

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