Annirak
Newbie level 6

I need to design a 200MHz filter with 200kHz bandwidth and a very steep rolloff. In particular, I need to expressly reject everything at 200kHz intervals from the 200MHz center.
Active filters are totally fine, and I'm already using a number of BF998 dual gate mosfets, so using more of those is fine by me. The amplitude of the signal where I'm filtering should be 1mV to 100mV.
I need to build this as a compact element. I'm fine with using some RG-174 as an element in the design, but I'd like to keep it to quarter-wave lengths, as coiling up half a meter of coax inside my filter will add quite a lot to the bulk.
Originally, I had planned to use a crystal or ceramic filter, but I soon discovered that they don't go this high. SAW filters, conversely, don't go this low.
Is my best bet going to be a pair of notch filters and a high-Q bandpass filter?
Active filters are totally fine, and I'm already using a number of BF998 dual gate mosfets, so using more of those is fine by me. The amplitude of the signal where I'm filtering should be 1mV to 100mV.
I need to build this as a compact element. I'm fine with using some RG-174 as an element in the design, but I'd like to keep it to quarter-wave lengths, as coiling up half a meter of coax inside my filter will add quite a lot to the bulk.
Originally, I had planned to use a crystal or ceramic filter, but I soon discovered that they don't go this high. SAW filters, conversely, don't go this low.
Is my best bet going to be a pair of notch filters and a high-Q bandpass filter?