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pls explain about 3dB pad and the reason for different metal housing shields.Well, as with any filter, you need some isolation between the two filters, such as a 3 dB pad or an amplifier stage. Also, you really have to pay attention to packaging issues with regards to leakage. If one saw filter gives you 50 dB of rejection, putting two together will not give you 100 dB of rejection unless you put them into two different metal housing shields!