RF & Wireless — question 7 of 10
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Your 2.4GHz Wi-Fi module passes bench testing perfectly using an SMA cable to a reference antenna. On the actual production PCB with a small chip antenna mounted near a metal enclosure wall, range drops significantly, and a VNA sweep of S11 shows the resonance dip has shifted down to 2.2GHz instead of the target 2.44GHz. What's going on, and how would you fix it without redesigning the PCB layout?