Circuit materials form the foundations for high-frequency designs, from the semiconductor to system levels. In particular, circuit-level materials tend to be taken for granted, even though the choice of a printed-circuit-board (PCB) material can impact the ultimate performance achievable with an RF/microwave circuit design. Hopefully, this quick review of some of these building-block materials used in high-frequency circuits and components can help designers better match a particular material to a design goal, even at the highest frequencies...
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