The characteristic impedance of the cable () is determined by the dielectric constant of the inner insulator and the radii of the inner and outer conductors. In radio frequency systems, where the cable length is comparable to the wavelength of the signals transmitted, a uniform cable characteristic impedance is important to minimize loss. The source and load impedances are chosen to match the impedance of the cable to ensure maximum power transfer and minimum standing wave ratio. Other important properties of coaxial cable include attenuation as a function of frequency, voltage handling capability, and shield quality.
The characteristic impedance of the cable () is determined by the dielectric constant of the inner insulator and the radii of the inner and outer conductors In radio frequency systems where the cable length is comparable to the wavelength of the signals transmitted a uniform cable characteristic impedance is important to minimize loss The source and load impedances are chosen to match the impedance of the cable to ensure maximum power transfer and minimum standing wave ratio Other important properties of coaxial cable include attenuation as a function of frequency voltage handling capability and shield quality