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PCA10040 PCB antenna type? (PIFA, MIFA, etc)

Hi, I just copied the antenna drawing by referencing the PCA10040 v1.1 and checking the white paper (λ/4 printed monopole antenna for 2.45 GHz).

I didn't have much knowledge about the λ/4 printed monopole antenna.

To tell the truth, I realized there were various types of antenna far later

like planar inverted-F antenna (PIFA) or Meandered Inverted-F Antenna (MIFA)

but I had no idea what antenna type I was copying.

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So the questions are,

  1. what type of antenna is used in the PCA10040 v1.1?

  2. I was lucky that my custom PCB (that uses nRF52832-QFAA) is a circle which had a radius of 40mm so I had enough space to draw the PCB antenna when copying the PCA10040.

Sadly, in the next PCB project, I have to create another circle custom PCB which has a radius of 23mm and uses nRF52832-QFAA.

This PCB has to mount inside a circle plastic case.

Also, the client doesn't want the chip antenna due to price.

Is there a recommendation PCB antenna layout for small PCBs?

-Best Regards

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