I have a A5887H antenna on one of my new designs and we tried to match it for Bluetooth which resulted in a really narrow response graph. The -10dB was met between 2400 and 2440 MHz. This is worse than described in the datasheet so i ordered a A5887H-EVB-1 evaluation kit to see the performance of that antenna. This gave me the following response:
The white vertical lines show the bluetooth bandwith (2400 and 2480MHz) and you see that the response only starts at over 2500MHz. Why is the evaluation module matched so far to the right? And is there a way to improve bandwith on the initial antenna setup?