Does there has "Half-Order Filter" (3dB/oct) ?

Hello,

I am trying to make a 3dB/oct High-Pass Filter, maybe it can call "half-order"? 

Because as I know the basic order for the first-order filter is 6dB/oct, but how can I make a 3dB/oct filter?

here is the 200Hz 6dB/oct High pass filter:

but how to make 200Hz 3dB/oct High pass filter, which slope is more gentle than the 6dB/oct.

Thanks!

BR.

Alvis

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