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We studied the high-frequency characteristics at 0.5–1.5 GHz of mask-printed silver paste lines with different filler sizes (nanoparticles or micro-sized flakes) and an etched copper foil on glass fiber reinforced epoxy substrate. Although the resistivity of silver-nanoparticle lines was 10 times larger than that of the etched copper foil, its return loss was almost equal to that of the etched copper...
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