Microstrip band pass filter using end-coupled SIRs

Details Microstrip band pass filter using end-coupled SIRs Microstrip band pass filter using end-coupled SIRs

2007-02-27

2007-02-27

Ham, Seungsook (Department: 2817)

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

C333S219000

Reexamination Certificate

active

10919332

ABSTRACT:
The present invention relates to a microstrip band pass filter and, more specifically, to a microstrip band pass filter using end-coupled stepped impedance resonators that can be used in a millimeter wave band, wherein the microstrip band pass filter comprises: a dielectric substrate; a conductor plate located on a lower surface of the dielectric substrate; and an input terminal, a plurality of SIRs and an output terminal located on an upper surface of the dielectric substrate in series, wherein the input terminal, the plurality of SIRs and the outputs terminal are conductors and end-coupled through gaps, whereby the microstrip band pass filter has a good attenuation characteristic and a narrowband characteristic, and is insensitive to the manufacturing error, and a fine frequency transition can be made without distortion just with width adjustment of the low impedance transmission line of the SIR.

REFERENCES:
patent: 4371853 (1983-02-01), Makimoto et al.
patent: 4506241 (1985-03-01), Makimoto et al.
patent: 5101181 (1992-03-01), Rauscher
patent: 5144268 (1992-09-01), Weidman
patent: 6771147 (2004-08-01), Mongia
patent: 11355009 (1999-12-01), None
patent: 99/18629 (1999-04-01), None
Makimoto et al., “Bandpass Filters Using Parallel Coupled Stripline Stepped Impedance Resonators”, IEEE Trans. on Microwave Theory 7 Tech. vol. MTT-28, No. 12, Dec. 1980, pp. 1413-1417.
Sagawa et al., “A Design Method of Bandpass Filters Using Dielecrtic-Filled Coaxial Resonators”, IEEE, Feb. 1985, pp. 152-157.

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