Hello, I bought a PurePath Wireless Headset Development Kit and then, developed my own board.
I don't have any expansive CAD software so I referred to the TI design notes :
I strictly applied the same size but looking at my board more closely, I realized that the radiator of the inverted F antenna is shorter than on the Headset Development board.
approx 25.6mm for mine and 26mm for TI. Why this difference ?
My board doesn't have the same size. You have the layout in the attached file.
My ground plane is much larger but is it a problem ?
My board is powered by a 3.3V power supply instead of 2.15V in the headset kit but my RF link range is approximatively the same.
Do you know where I can optimize my design ?
Thank you for your help :)
6177.inverted f antenna.pdf
The small difference in length should not make significant impact on the antenna performance. The fact that you have a larger ground plane could possibly make the resconance frequency of the antenna shift, leading to an imperfect match. Generally a bigger ground plane than what we have on the headset board is good for the antenna efficiency if the antenna is tuned correctly. To tune this you need a network analyzer, but since you are experiencing similar range as the headset board I would be satisfied :) Running on 3.3V instead of 2.15V will give you somewhat increased output power from the CC2590.
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