Waveguide E-plane RF bandpass filter with pseudo-elliptic...

Details Waveguide E-plane RF bandpass filter with pseudo-elliptic... Waveguide E-plane RF bandpass filter with pseudo-elliptic...

2007-11-06

2007-11-06

Lee, Benny (Department: 2817)

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

C333S212000, C333S248000

Reexamination Certificate

active

10540407

ABSTRACT:
The invention relates to RF bandpass filters with pseudo-elliptic response. In a filter comprising a dielectric substrate placed in E position in a rectangular waveguide and comprising inserts on one of the surfaces of the substrate are placed conductors linked electrically to the walls of the guide, and on the other surface of the substrate opposite these conducting inserts are placed electrically floating inserts that make it possible to determine zeros in the transmission curve of the filter. This yields a filter exhibiting a response curve of pseudo-elliptic type which improves the rejection of spurious frequencies without increasing the dimensions of the filter.

REFERENCES:
patent: 4761625 (1988-08-01), Sharma
patent: 4897623 (1990-01-01), Reindel
patent: 4990870 (1991-02-01), Reindel
W. Schwab et al. “Compact Bandpass Filters With Improved Stop-Band Characteristics Using Planar Multilayer Structures”, Institute of Electrical and Electronics Engineers, Int'l Microwave Symposium Digest, Alburquerque, Jun. 1, 1992, vol. 3, pp. 1207-1209.
R. Vahldieck: “Quasi-Planar Filters For Millimeter-Wave Applications” IEEE Transactions on Microwave Theory and Techniques, IEEE Inc. New York, vol. 37, No. 2, Feb. 1, 1989, pp. 324-334.
Search Report dated Apr. 29, 2004.

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