What Is the Structure and Transmission Principle of a Coaxial Cable?

Structure and Transmission Principle of Coaxial Cables:
A coaxial cable is a shielded and non-dispersive structure. Theoretically, its lower cutoff frequency is zero, corresponding to a cutoff wavelength approaching infinity. It consists of two concentric conductors (inner and outer) and a dielectric material in between, forming a two-conductor transmission line.

Typically, the outer conductor is grounded, and the electromagnetic field is confined between the inner and outer conductors. As a result, coaxial cables have almost no radiation loss and are nearly immune to external signal interference. Compared with twin-lead transmission lines, coaxial cables have a wider operating frequency range and can be used in frequency bands higher than the centimeter-wave range.

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