I am transmitting in channel 3 of 802.11b, centered at 2.422Ghz. Details aside, let me just say that it is very important for my application that I sharpen up the spectral mask beyond that of the802.11b standard. To be specific I need to purchase a bandpass filter such that I get attenation of greater than 60dB at +- 15Mhz from the center, i..e outside of [2.407Ghz, 2.437Ghz]. I am looking for suggestions on where to purchase such filter(s) with the usual parameters in mind, cost, lead time, etc.
I did see the filters that hyperlink sells, but it would take many of their 8 pole filters in series to get what I need and they additionally don't sell filters for one of the channels i would need. Maybe I need to go custom on this? Any suggestions are greatly appreciated. Thanks,