Hi team,

As the title say, why unshielded twisted pari wires are low-pass in nature. I am assuming that is compares to shielded pair?? My understanding is shielded pair has more capacitance than the unshielded, hence more low-pass than unshielded??

It's from here:
http://ww1.microchip.com/downloads/en/appnotes/01120a.pdf

 

As the title say, why unshielded twisted pari wires are low-pass in nature. I am assuming that is compares to shielded pair??

No.
Shielded twisted--pair also would be low-pass in nature, perhaps more that the unshielded variety.

 

The reason is that a twisted pair of wires has distributed series inductance and distributed shunt capacitance. These properties are expressed in Henrys per foot and Farads per foot with appropriate prefixes to select the magnitude. The simulation model would look like a long chain of L-sections which have a low pass characteristic. Coaxial cable depending on it's geometry has a much greater capacity to pass high frequency signals. Hardline is actually a wire inside a large metal cylinder and is not actually cable, more like bendable conduit with foam inside.

https://www.solidsignal.com/rfs-7-8...4btDuI1og_Z8swmeJ6HT5A8mqS6N365xoCd6sQAvD_BwE

That price is per foot.

 

Thanks for the explanation guys! @crutschow @Papabravo