Nordic - printed antenna and impedance matching circuit

[efi malz]

Theranica  current solution already has a printed MIFA antenna and an impedance matching circuit that they have tested and is working very well.

they  would like to keep using their existing antenna and would like to know which impedance matching circuit to use.

 

Thernica current matching circuit and antenna are:

[Marjeris Romero]

Hi,

Did you forget to attach something else to the question?

Best regards,

Marjeris

[efi malz]

hi

I attached twp picrtures not sure they are attached so I will attach again

the first picture is

matching circuit and antenna are:

the secind picture is:

The Nordic uses a different type of antenna and has the following matching circuit

the first p

[efi malz]

hi,

any update on this?

BR

[Marjeris Romero]

Hi,

They need to use the 0,8pF and 3,9nH components, because they are part of the radio matching network of the nRF52 (not the antenna matching network).

In general a good designed MIFA antenna is already matched to 50 ohms, so if they don't plan on changing the ground plane between the two boards considerably they can use the same antenna design. The schematics will then look like the second picture you attached.

Best regards,

Marjeris

[efi malz]

see customer reply:

To clarify,

Our MIFA antenna is matched to 50 ohm and we do not plan on changing the ground planes. So is the impedance of the IC (both Cypress and Nordic), as well as the traces leading to/from the IC and the antenna.

The circuit shown in our current implementation (1^st picture below) actually serves only a filter.

 

Do you mean to say that the Nordic requires the components as in the 2^nd picture, as the Cypress required the 1^st one, and we should use the components in the 2^nd one now?