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I saw one product of one China Nanjing verdor. On pcb trace, there is a coat, then pin was soldered on, but DC is blocked, and I guess RF is shorted. I will measure later and let you know the results.
I tested it today. The pin is really RF shorted to GND and DC blocked, with DC=0.35V. I guess that they use some glue, who can suggest that?
And I simulate in HFSS about the epoxy of FR4, its insertion loss less than 0.1dB when epoxy thickness is 0.1mm.
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