The characteristic impedance of a coaxial line can be calculated as follows:

(13.1) |

Overall losses in a coaxial cable consist of dielectric and conductor losses. The dielectric losses compute as follows:

(13.2) |

The conductor (i.e. ohmic) losses are specified by

(13.3) |

with denoting the sheet resistance of the conductor material, i.e. the skin resistance

(13.4) |

In normal operation a signal wave passes through the coaxial line as a TEM wave with no electrical or magnetic field component in the direction of propagation. Beyond a certain cutoff frequency additional (unwanted) higher order modes are excited.

(13.5) | ||

(13.6) |

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