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I would like to add an Hirose U.FL antenna connector to my PCB. I have no previous experience of using them, so I would like to now if I should connect both of the GND pins to the PCB ground or it's enough to connect one of them. I found this PCB trace. enter image description here

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You should connect both pins for two reasons:

  1. Maintain 50 Ohm impedance - With one pad only, the impedance is not guaranteed to be 50 Ohms.
  2. Mechanical strength - A single pad is more likely to fail than two pads when pulling out the mating connector.
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