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can anyone give some advice on 21.4MHz bp filter?

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l.j.zheng

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21.4mhz

The filter is to be used in a RX module as an IF .

It's maybe hard to design such band filter with LC under the technical index:

Center frequency:21.4MHz, Passband=100KHz, Rejection at 21.4MHz±150KHz>44dB

I.L.≤5dB.

I try to find some crystal filters, but I cannot find a one with the length<22mm.

I've also simulated some LC's ,but it need too many orders to get good performance and to realize.

So can anyone give some advice on how to realize it, thanks a lot!
 

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