Hi guys,
I'm looking for a small Bluetooth 2.4Ghz SMD antenna and I came across a part from Wurth Elektronik, part no. 7488960245. The Antenna is specified to have a 50 Ohm impedance, great.
However, one page below in the datasheet, there is a typical connection diagram, which includes an impedance matching circuit made of a 1.2pF capacitor and 2.2nH inductor.
There's even a PCB example, where if you enter with a 50 Ohm line, you go through the matching circuit first, and then to the antenna.
Now here's what's confusing me. If the feed/input impedance is 50 Ohms and the Antenna impedance is also 50 Ohms, why do you need an impedance matching circuit?
Thanks for any input on this topic,
Regards,
Ivo