Am trying to learn more about ceramic chip antennas. I found this webpage: [Chip Antenna Layout for 802.11 Applications - Johanson Technology](https://www.johansontechnology.com/chip-antenna-layout-for-802-11-applications)I have seen a lot of datasheets with drawings similar to these. Before I even get to the point of trying to design a circuit, impedance match, design pi filter, etc. I have some basic questions about these datasheets. For example, I see vias which makes me think there is a dedicated Ground layer, but there is also the large "orange" layer in the figures which is labeled "Ground". So is this saying if I have a dedicated ground layer that I should also have a solid "Ground" region on my top (signal) layer and connect them with vias? I am assuming that large orange area labeled "ground" is on the top layer because the microstripline and pads for the antenna are also orange. Or maybe this is just for a 2 layer board? Also, what is the grey area around the microstripline?
Any help is appreciated.