From my reading on quadrature signals, any real life periodic signal can be represented as a sum of cosine and sine. Cosine is the sum of two phasers rotating in opposite direction. Sine is the difference of the phasers.

So if the ‘negative frequency’ is the phaser component driven in the ‘opposite direction’. Does that mean, whenever I read about a transmission line where there’s reflected and transmitted signal, that the ‘negative frequency’ is the same as the ‘reflected signal’ in a transmission line?

Somehow I doubt that's the case, but I'd like to hear you experts take on it.

 

Define ‘negative frequency’.

 

From what I understand, if I stop thinking in term of frequency and amplitude and start thinking in phasors, then it can be shown that sine and cosine are made of two quantieis called phaser, where there's a positive phaser e^jwt, and negative phaser e^-jwt, and that's where the 'negative frequency' component comes in.

 

Hello,

The negative sign denotes probably a 180° phase shift.

Bertus