I am learning about characteristic impedance. My question is if the characteristic impedance is 200 ohms at 1000 kilohertz what is the characteristic impedance at 2000 kilohertz.How do I calculate the answer; I can not find the information in the material I am reading.
Regards,
Walter

 

Still 200 ohms. The characteristic impedance is independent of frequency.

 

Characteristic impedance is a function of the geometry of the conductors and the velocity factor. Neither of these depend on frequency. This does not mean that you can use cables of extremely long length since signal loss is related to frequency.

http://www.allaboutcircuits.com/vol_2/chpt_14/3.html