What is the relation between carrier's frequency and the bandwidth

[David83]

Hi,

In underwater acoustic communication systems, it has been said that because of the absorption loss at high frequencies, the bandwidth is limited. The question is: what is the relationship between high frequency carriers and the bandwidth of the channel?

Thanks

 

[klystron]

The bandwidth is not related to absorbtion losses. The carrier frequecy is related to absobtion losses
It is the TX transducer that limit the bandwidth. TX transducers normally operates at a mechanical resonance ; with Q > 10

 

[David83]

and there is not relation between carrier's frequency and bandwidth? Milica says eventually the bandwidth will be limited by the traducer, but I think absorption loss affects the bandwidth via affecting the carrier's frequency, right?. Do you have any good resource about why the traducer limits the bandwidth?

 

[klystron]

A underwater TX transucer is a mechanical resonating device with a relatively small bandwidth relative to the centre frequency, that will be your carrier frequency The electrical impedance of a TX transducer also present with a resonance response