RF SAW filters - typical and minimum insertion loss

[dowjones]

sawtek saw 1.5ghz

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

 

[mr_ghz]

Hi dowjones,

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

Greets

 

[BigBoss]

and Sawtek... but very expensive.
rgrds

 

[hr]

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.

 

[cliffliu]

Maybe u can try to DR filter.
It's a good insertion loss and hi-Q.
TOKO company u can link by web.
I think DR filter good enough for GPS receiver.

 

[WMAN]

Fujitsu, i recommand.

 

[charles_lu]

SAW Filters Provider

EPCOS, https://www.epcos.com

 

[Jackwang]

RF SAW filters

do you know the fixed components about GPS SAW bandpass filter? or you can tell me its type or name.

 

[nirvanafl]

RF SAW filters

The SAW' insertion loss is nomally more than drfilter.