I am designing a layout for this Chip antenna "https://www.johansontechnology.com/datasheets/antennas/2450AT18B100.pdf". In the datasheet they have Test Board as an example layout. I have a couple of questions on their test board. As shown in the below layout:
I am not sure what no ground means here?
I know that the antenna pin with the brown mark is connected to the inductor, but what is the other antenna pin connected to?
Should the ground plane be exactly 46mm? What if I need it to be smaller?
The feed line should be 50ohm, can I change the line width, and decrease the 19mm length and keep the impedance the same?
Thanks in advance.