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Antenna design guidelines for NRF52832 based board

Sweety

Hello, I am designing a 2 layer board with NRF52832 IC. I am following all design considerations and reference design mentioned in IC's datasheet provided by Nordic. I have a query regarding antenna. "Application Note AN043 pdf contains reference meandered f-antenna antenna for 2.4gHz. As my requirement is also for 2.4gHz, I am using the same antenna as mentioned in pdf link: www.tij.co.jp/.../swra117d.pdf

This is the reference antenna image image description

In this pdf, antenna distance from board edges(D1, D2 and D3) is mentioned. But my board dimensions would be 100X50.

Plese clarify my following doubts

  1. Is it mandatory to follow those dimensions(D1, D2 and D3)?

2)Is board size affect antenna performance?

3)Is it required to use any passive component to tune the antenna?

4)Unfortunately, I don't have network analyzer with me. Can you suggest any online simulation tools to validate my design?

  • 0

    Anytime you change the way the antenna fits on the board you will change the antenna performance/input impedance.

    No matter how good of a job you do in copying the design and modeling the design before implementation you will likely have to do some discrete matching. So be prepared for this and find someone with a reasonable VNA who knows how to use it. Also, there are some really respectable USB VNA's for around $500 so you could choose to invest in one.

    On the D1, D2, D3 spacing they are not as significant as the size/shape of the ground plane. The ground plane will influence the design the most.

    You should also model your final solution before implementation. This will keep you from making a big mistake and will give you some idea of the matching requirements of the antenna. Sonnet has a nice EM simulation tool that will model a PIFA. They offer a free version of limited scope that even has a PIFA design in the examples to help you on your way.

  • 0 in reply to AmbystomaLabs

    Hello, Thank you so much for the answer. Which VectorNetworkAnalyzer is preferable for this application?. Please provide the specs of VNA and also references if possible. Thank You.

  • 0 in reply to AmbystomaLabs

    There is no perfect VNA. 99% of the function comes from knowing how to use it. People spend quite a bit of type just understanding vector math and how a VNA displays those data. You just need one that covers the 2.4GHz band. So as I said, find someone who knows how to use one. Otherwise the data from it will be useless.

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