Antenna Matching

RE: Antenna Matching

haakonsh — Thu, 12 Jul 2018 07:48:38 GMT

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.

RE: Antenna Matching

AmbystomaLabs — Tue, 10 Jul 2018 18:50:46 GMT

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.

RE: Antenna Matching

AmbystomaLabs — Tue, 10 Jul 2018 15:09:29 GMT

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

RE: Antenna Matching

AmbystomaLabs — Tue, 10 Jul 2018 15:00:12 GMT

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.

RE: Antenna Matching

Dieter — Tue, 10 Jul 2018 13:58:12 GMT

we need this for the Bluetooth output of the NRF52832

RE: Antenna Matching

cbd — Tue, 10 Jul 2018 13:47:13 GMT

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.