Antenna Matching

[Dieter]

Hello,

we need the S11 and the S21 data for Antenna Matching,

Could you please provide this?

best regards

Dieter

[cbd]

Perhaps some more information would be helpful.

You don't specify the hardware nor the circuit that you're using as a reference to what I assume are component labels.

[Dieter]

we need this for the Bluetooth output of the NRF52832

[AmbystomaLabs]

S21 is the forward transmission term of the scattering matrix and not useful here unless you were to somehow have access to the inside of the nRF.

The recommended antenna load or S11 conjugate is in the product specification. 

[AmbystomaLabs]

Here is a recent discussion on the subject too: devzone.nordicsemi.com/.../nrf52832-ant-pin-impedance

[AmbystomaLabs]

I should also point out that not always is the best load a conjugate of the souce. So it is possible the spec antenna load is not a conjugate of the nRF output. It will be just what they determined to be best.

[haakonsh]

We rarely use S parameter calculations in-house because the amount of simulation needed for it to be useful requires a lot more resources than sticking a pi-network to the board and measuring the output power and harmonics of the radio. If you get +3dBm (including ~1dB cable loss) with a good 10dB margin on harmonics after the match/filter then you're good. We offer a free tuning service where we do this for customers who do not have the equipment or knowledge to do so themselves. 

If you want to simulate stuff you should focus on the antenna as is this is where most of the RF energy is wasted, and if you still need the S-parameters I can get you that after the holidays, but I need to know what package you're using.