I can find chokes (Fair-rite 61 material) that are good to 1000 MHz. What materials are good for attenuating frequencies above a GHz? I have a legacy amplifier in a system that we want to get a CE mark on. It is having immunity issues in the band from 100 MHz to 2400 MHz. I have seen good initial test results by adding chokes with 43 material (<250 MHz) on the amplifier pins, so I'm hoping to solve this by blocking the EMI path across the full band. The EMI source is predefined, and I'd rather not redesign the EMI receptor (amplifier).
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