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RF SAW filters - typical and minimum insertion loss

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dowjones

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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

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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

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and Sawtek... but very expensive.
rgrds
 

hr

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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

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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

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Fujitsu, i recommand.
 

Jackwang

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RF SAW filters

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

nirvanafl

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RF SAW filters

The SAW' insertion loss is nomally more than drfilter.
 

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