microstrip antenna for gps

hello friends...i'm beginner in this forum....i from Malaysia....anybody can help me to design 1.5Ghz microstrip antenna for GPS receiver...plz email me at nyamook@hotmail.com....thanx

Active or Passive

hello, i need it.
I am studying GPS related problem, and i need a GPS antenna with microstrip design. can you give me some advice?
note: this antenna must be a narrowband one, such as 20MHz, who can give me help?

I tryed to build like patch antenna,
but dimensions are big about 4-5 cm.
I get S11 about 10-15 dB.
But I dont checkit in function, because it was to big for my design.

It is hard to make an antenna with this limited bandwidth. The better thing to do is to use an antenna with modelate bandwidth and then cascade it with a good bandpass filter. This will be better.

Search for patch antenna structures. There are a lot of examples available

http://www.swissatv.ch/documents/Des...ch_Antenna.pdf

There are plenty of more to find! Google leads the way ...

if annybody have paper about the Active GPS ANTENNA.