hi,
can somebody assess me on the typical and minimum insertion loss and selectivity of bandpass RF filters made on SAW technology?
The frequency of interest is L band, close to GPS (1.5GHz more or less), and the bandwidth is about 20MHz
SAW filters differs extremly from each other, depending on the application
they are thougt to use in.
So the insertion loss is normaly in the range -3dB .. -5dB but there also
exists SAW's with -15dB insertion loss or more at the center frequency.
The selectivity in your frequency range would be about:
-20dBc 100MHz spaced away
-30dBc 400MHz spaced away
You will maximally reach about -40dBc. For further info look at the data-
sheets from some manufacturers of SAW's like Murata, Triquint or Sanyo
oh,i agree with mr_ghz very much.you know,saw filter is called customer device,so you must give the specification
to the designer,for example,bandwidth,insertion loss,vsws,balanced or sigle end in/output....
the epcos and thomson are very good and big saw filter supplyer.