What happening again?
This might be leakage that happens outside the SAW, for example grund currents that couple from input to output.
85dB isolation is a lot ....
Show me result of adding 20dB attenuator between two SAWs.Each of them is a module with case and connected with male thru SMA.
............
Why the sum of the two attenuators is not correct?
show me {s11, s12, s21, s22} of single and cascaded SAW.
No.Spectrum of single SAW(input=17dBm) with DUT= https://ibb.co/5FFsBJy
No.
Show me Spectrum for fin=95.38MHz.
BTW, do you use Signal Generator for input ?
Why does it have LSB(-0.1MHz) and USB(+0.1MHz) around 85.38MHz ?
It seems reference leak of PLL.
Now I add a 20 dB attenuator between two SAWs.
Picture: https://ibb.co/J2gYJKt
some leakage from signal source into the spectrum analyzer.
I suspect leakage of Cable.
It is an isolation problem.
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