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Average Frequency Shift in central frequency for (a) Polyimide (PI), Polydimethylsiloxane (PDMS) and Polytetrafluoroethylene (PTFE) that operate at a frequency range of 2.2–2.5 GHz, (b) PTFE, PDMS and Polyethylene Terephthalate (PET) that operate at a frequency range of 2.5–5.0 GHz, (c) PI, PTFE, PDMS and Liquid Crystal Polymer (LCP) that operate at frequency range greater than 5 GHz.
