What are the characteristics of broadband coaxial cable?

Low interference, high frequency bandwidth and something else... The main advantages of coaxial cable are # Good shielding. This almost eliminates interference from external electromagnetic fields; it also reduces radiation from the cable to almost zero. Only a waveguide is superior in this respect, and that can be used only in the microwave region. # Good bandwidth and low loss. These two are grouped together because they enter into a three-way relationship with cost. One can extend frequency response right into the microwave region, and achieve lower and lower loss figures; you just have to pay for it. Again, waveguide can better microwave performance and loss figures, but at high cost in weight as well as money. # Good power handling. # Flexibility. Co-ax can go round corners without any problems. Most other transmission lines have problems with a change in direction. # A characteristic impedance which is known, uniform all along the cable and stays the same when the cable is curved. # Can be run anywhere without being affected by its surroundings; it can be run underground or underwater provided it has a "non-contaminating" outer jacket.