Is there a recommended chip antenna for the STM32WB55?

[AClif]

I am putting the STM32WB55 into a space sensitive application so i would like things as small as possible. The application note (AN5129) is very good for a PCB antenna, but I would like a chip antenna to be as small as possible (cost is less of an issue).

Are there any recommended chip antennas (or even better, reference designs using them) for the STM32WB?

Thanks!

[Remi QUINTIN · Accepted solution]

You can refer to AN5434 in which a very small chip antenna is described.

[Danish1]

I just downloaded that application note, which evaluates several pcb antennas. But there seems to an error in referencing the reference chip antenna.

In AN5434 Rev 1 January 2020, Section 3.8 states:

3.8 Chip antenna

A TDK chip antenna for the 2400-2484 MHz frequency band [7] is selected as the reference antenna. It is not possible to simulate it because its electromagnetic model is not known. The layout recommended by TDK is used. The matching to 50 Ω will be carried out based on measurements with the board and antenna connected. The gain patterns are characterized once the impedance matching is performed.

But when I look at the references, [7] is the reference for Yagi antennas:

[7] H. Yagi, «Beam transmission of ultra-short waves,» Proc. IRE, vol. 16, pp. 715-741, 1928.

Can you say any more on that chip antenna?

[AClif]

Section 6.4 gives a bit more detail, including the part number, TDK ANT016008LCS2442MA2. The product page is here: https://product.tdk.com/en/search/rf/rf/antenna/info?part_no=ANT016008LCS2442MA2

[AClif]

And thanks again, Remi, for your help!

[Remi QUINTIN]

Indeed!

[8]TDK, ANT016008LCS2442MA2 multilayer antenna, Sep. 2016, https://product.tdk.com/info/en/documents/data_sheet/rf_ant_ant016008lcs2442ma2_summary_en.pdf

The application will be updated accordingly.

[aji]

I'm designing an RF circuit using the STM32WB55CUG7 microcontroller and a ceramic chip antenna (ANT016008LCS2442MA2). However, the antenna circuit isn't working, as it doesn't show the Bluetooth name in the mobile application. I'm referring to the STM32WB55CUG7 module schematics to design my RF circuit, but the circuit I designed isn't functioning. Interestingly, the same design works perfectly on the STM32WB55CUG7 USB dongle board. I've attached my RF design schematic along with the reference circuit from the STM32WB55CUG7 module schematics and antenna matching circuits. Could someone please help resolve the issues in my design? Thank you...

My schematic diagram

My schematic diagram

antenna matching circuit