Why must designers switch from $ ext{FR-4}$ to materials like $ ext{PTFE}$ for circuits operating above a few $ ext{GHz}$?
Answer
$ ext{FR-4}$'s dielectric loss becomes substantial at those frequencies.
The dielectric loss in $ ext{FR-4}$ becomes significant above a few $ ext{GHz}$, necessitating the use of low-loss laminates such as $ ext{PTFE}$ based materials to maintain signal integrity.
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