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November 15, 2023
the wave travels slower in the coaxial cable than it would in free space.
This slowing down of the wave within the coax is primarily due to the dielectric material that separates the inner conductor from the outer shield. The dielectric constant (or relative permittivity) of the material dictates how much the electromagnetic field is slowed. The higher the dielectric constant, the slower the wave propagates, and consequently, the lower the velocity factor.
Now, considering the implications of this for coil systems and specialized resonant or reactive transformers:
Impedance Matching: Coaxial cables are designed to carry signals with a specific impedance, and this is a result of the cable's inductance and capacitance per unit length. When designing coil systems, especially for RF applications, keeping impedance in mind is crucial. The built-in capacitance and the slowing effect can be used to create matching networks that ensure maximum power transfer.
Resonance Tuning: In resonant circuits, like those used in radio frequency (RF) transformers, the velocity factor of the coax can be exploited to achieve resonance at a desired frequency. Since the physical length of the cable is longer than the electrical length (due to the velocity factor), you can fine-tune the resonant frequency without changing the coil's dimensions.
Phase Shifts: The velocity factor can also be used to create precise phase shifts in signal propagation, which is essential in applications like phased array antennas. By adjusting the lengths of coaxial cables, you can control the timing with which signals reach different parts of a circuit or antenna system.
Miniaturization of Circuits: Because the electrical length of a coaxial cable is effectively reduced by its velocity factor, RF coils and resonators can be made physically smaller while maintaining the same electrical properties. This can be particularly advantageous in compact electronic designs.
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