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Antenna tuning with chipset antenna

vidal

Hello,

I developed a Nordic board with 2450AT18B100 chipset antenna. I follow the design of Solar Powered Sensor Beacon.

infocenter.nordicsemi.com/index.jsp I test it and it works fine, but I want to tuning the antenna in order to get minimum return lose in signal.

So, I implement this antenna circuit in my board. And

From johanson technology values are: I

I suppose that from C3 and L1 you have to modify some references values of johanson chip antenna.

In general, my questions are:

Can you explain me each part of this circuit?.

Can you explain me why do you change this values and how do you calculated?.

Can you explain me how tuning the antenna?. Because your reference document for that do not explain how to do it in this case.

infocenter.nordicsemi.com/.../nwp_017.pdf

Thanks in advance.

Jose.

Others attached files. Conductor Impedance

image description

Trace Lenght Solar Beacon

image description

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  • 0

    Hello Kristin,

    Thanks a lot for your swift reply. I have a new questions...

    How can I measure the output power?.

    About VNA I suppose that the signal of VNA is in C13 and the GND of VNA in L4 (GND), that is right?. About this process...that means that doing that we will be sure about the impedance adaptation between all parts but...what about the frequency resonance?. Imagin that impedance is right but frequency resonance is wrong... I suppose that you make some calculations to do that. Can you shared with us this calculations.

    Thanks in advance.

    Jose.

  • 0 in reply to vidal

    Dear Kristin,

    Thanks for your swift reply. Now I understand a little bit more. I am only have some questions:

    First at all, I have a VNA from 1MHz to 3GHz and a spectrum analyzer (MDO4034C + SA3) of 3GHz, so it is impossible to me measure at the harmonic at 4.88 GHz...Is this a great problem?. Why is not possible the measure the principal frequency (2.44GHz)?.

    Second, when you are referring to measure the output power, I suppose that is about to validate if I set TXPower register (0x50C) of nRF52 to 0x00 (0dBm) I see in the spectrum analyzer 0dBm. To do that I suppose that nRF52 have an special configuration in order to test it...similar to TX in continuous mode?.

    Thanks in advance.

    Jose.

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  • 0 in reply to vidal

    Dear Kristin,

    Thanks for your swift reply. Now I understand a little bit more. I am only have some questions:

    First at all, I have a VNA from 1MHz to 3GHz and a spectrum analyzer (MDO4034C + SA3) of 3GHz, so it is impossible to me measure at the harmonic at 4.88 GHz...Is this a great problem?. Why is not possible the measure the principal frequency (2.44GHz)?.

    Second, when you are referring to measure the output power, I suppose that is about to validate if I set TXPower register (0x50C) of nRF52 to 0x00 (0dBm) I see in the spectrum analyzer 0dBm. To do that I suppose that nRF52 have an special configuration in order to test it...similar to TX in continuous mode?.

    Thanks in advance.

    Jose.

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