I implemented the SL3S4021FHK to my design using the EU reference antenna of "AN11180 UCODE I2C PCB antenna reference designs". Here's a picture of antenna design:
It doesn't reach the proposed distance of ~10 meters, let alone a single meter. I tried researching the type of antenna but got no definite idea about it. I'm fairly new to antennas, too.
Thus my question:
What type of antenna is this? Is it truly a slot antenna, because the wide opening resembles more of a loop antenna?
What parameters factor in when adjusting its impedance? Is there a literature recommandation for this?
I'll be needing this for my bachelor thesis.
Thanks a ton and best regards