Internal antenna options

Phillip Vuchetich

June 15, 2021 23:15

Is there a good method to select an internal u.fl antenna to connect to the M1-N1 inside an enclosure?  For example, when connecting with Verizon, which only has specific bands approved/validated for the nRF9160, are some antennas that connect via u.fl better optimized for Verizon-specific bands?

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  Steve Poulsen

  June 15, 2021 23:40

  Verizon certification was performed with this antenna:

  https://www.semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=71848 

  It was selected because of it's good performance in the bands of interest. The data sheet shows the performance across all frequencies.

  https://www.semiconductorstore.com/pages/asp/DownloadDirect.asp?sid=1623774597456 

  You can see that we need to be at 700, 1700, and 1900 Mhz here:

  https://www.frequencycheck.com/carriers/verizon-wireless-united-states 

  The datasheet above is good at 1700/1900 and "ok" at 700.

  If you want to go smaller on the antenna, performance will likely be worse, but you can compare the return loss or VSWR at those frequencies. An extremely high return loss or a VSWR that is 1.0 is ideal, but in practice, it's not feasible to get to those numbers. If you compare return loss, you can get a feel for how many dB an antenna is better/worse than another.

  NOTE: direction also comes into play. The manufacturers have that data, in 3D.

  NOTE: placement of the antenna and orientation can affect how it best reaches the towers as well.

  Hope this helps! Feel free to add more questions and we can further clarify/expand on these comments.

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