The signal attenuation is n db/x frequency doubling (x is generally 2 or 10).

For example, 3db/2 frequency doubling means that when the frequency is doubled, the signal is attenuated by 3db.

3db/ 10 frequency doubling means that when the frequency becomes 10 times, the signal is attenuated by 3db.

The original title should be 3db/2 frequency doubling.