Question

(Q1) Explain the applications of the stability of the phases.

Answer 1

Solution :

Phase stability in microwave cables is important in applications where temperature plays an essential role. The challenge is well known in the RF cable industry: PTFE, despite having excellent dielectric properties especially at high frequencies, making it an excellent insulator, also shows a non-linear change in phase when subjected to the 15–25 °C temperature range. This behavior, also known as PTFE knee, has caused several issues across major aerospace, defense and test & measurement equipment manufacturers.

phase stability is critical for more specific applications, such as phased array antennas, where it is precisely the phase what steers the direction of the antenna’s signal; the newest body scanners which uses similar phase array technology, SAR Satellites where some of the challenges explained above are present; or network analyzers, where the phase invariance over temperature is vital for providing accurate measurements.

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