GPS notch (banstop) filter

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biff44

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gps notch

I have a 1 watt transmitter, and need to notch out its noise output in the GPS band. Anyone have a design for a printed narrowband notch filter that I could lift? I would probably happy with a 2 or 3 pole filter. Thanks
 

gps notch filters

What is your preferred substrate (diel const, thickness)?
 

gps notch filter

One option proposed for rejection of 2nd harmonic of 900MHz use a long bended microstrip line and a resonator between lines.
**broken link removed**

Other option, having smaller dimensions use DGS topology (Defected Ground Structure).
http://ael.snu.ac.kr/paper_file/mtt2002_3.pdf
 

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