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except minicircuits ,others give small size filters only for ISM bands.
I tested Minicircuits LFCN ,at stop band as its datasheet said it gives 30 db attenuation to me, I cascaded another one of this filters(seri) to get more attenuation but it does not give more attenuation,why? Is there a way to get more than 30 db atten. for harmonics ?
The harmonic level relative to main signal is -50dB ,Is this good for LO of a mixer?