Hey guys...
I am trying to understand how voltage and current exist on a TL.
Lets say we have a coaxial cable, that is terminated with a load (matched , for now)
Say we have a voltage out (say a sine wave) from a circuit like an amplifier or something... so say the core of the coax is connected to the output, and the outer conductor of the coax is connected to ground...
If our output is of high enough frequency, ( ? ) our coax no longer acts as a simple wire, and behaves as a TL .. ie: lumped analysis no longer applies ( when exactly does is this the case ?)
Now.. the voltage is no longer the same along the length of the coax.. and as a result, the current also varies.... HERE lies the confusion....
when we talk about voltage and current (say across a resistor) , we talk about the voltage being ACROSS the resistor, and the current is THROUGH the resistor...
In the case of the TL .. what is the potential difference across? isn't the voltage variation with respect to ground ? (outer conductor) ? and where/how does the current flow ? does it travel through the dielectric ? I understnad that the Voltage over the Current is the Characteristic Impedance... what exactly does it represent ?
Thanks guys
I am trying to understand how voltage and current exist on a TL.
Lets say we have a coaxial cable, that is terminated with a load (matched , for now)
Say we have a voltage out (say a sine wave) from a circuit like an amplifier or something... so say the core of the coax is connected to the output, and the outer conductor of the coax is connected to ground...
If our output is of high enough frequency, ( ? ) our coax no longer acts as a simple wire, and behaves as a TL .. ie: lumped analysis no longer applies ( when exactly does is this the case ?)
Now.. the voltage is no longer the same along the length of the coax.. and as a result, the current also varies.... HERE lies the confusion....
when we talk about voltage and current (say across a resistor) , we talk about the voltage being ACROSS the resistor, and the current is THROUGH the resistor...
In the case of the TL .. what is the potential difference across? isn't the voltage variation with respect to ground ? (outer conductor) ? and where/how does the current flow ? does it travel through the dielectric ? I understnad that the Voltage over the Current is the Characteristic Impedance... what exactly does it represent ?
Thanks guys