Custom NRF52 No Antenna Signal

[ricewnr]

We created our own PCB for the NRF52 with a Johanson chip antenna but no matter what we do, we can't get a signal from the Antenna, not even a weak one to show up on the spectrum analyzer. We verified that the NRF52 chip itself works by running a peripheral example.

Has anyone else run into this problem, can you take a look at our design? We're missing a pi network but we should still see something right?

We've consulted the following questions: devzone.nordicsemi.com/.../ devzone.nordicsemi.com/.../

Gerber files for pcb layout nrf52_pcb_layout.zip

Bill of Materials

nrf52_pcb_layout.sch

[ricewnr]

@Bjørn Spockeli: Thanks for the reply! I uploaded the gerber files as edit to the original post. So far we've tried:

1. Verify that LFCLK sources off synthesize RC clock, HFCLK sources off external XTAL.
2. Verify that pin XC2 is getting a 32MHz input from the crystal (suggesting a clock rate of 64 MHz?)
3. Verify that the SPI pins work on the chip.

However, we ran into problem when we tried to program the Radio Test example on to the chip. We modified the example such that the antenna should be constantly outputting signal at exactly 2.4GHz. We tested this code on DK and it worked fine, but on our PCB it is just dead silent.

What could be causing the problem? Thank you!