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

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

One option proposed for rejection of 2nd harmonic of 900MHz use a long bended microstrip line and a resonator between lines.
http://www.priorartdatabase.com/IPCOM/000008035/

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