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Antenna Matching and Tuning

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lguancho

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Hi, anyone has done and tuning and matching of Bluetooth ceramic chip antenna (such as ACX or Murate parts) on FR4 PCB. I am currently designing Bluetooth Headset and Compactflash cards, and did lots of antenna matching. I always do a single port calibration ( open short match), before measurement of the antenna resonant frequency and input return loss.

Question: I always can't get good open calibration on my product PCB. When doing open cal, I just leave the antenna pad open. (By the way, a solder a flexible RF cable (with centre conductor exposed) directly onto my board to perform the calibration)

Anyone care to share their experience? :)
 

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