I have tunned my antenna correctly with a VNA (lifting components, matching on final design, etc), but it doesn´t always get a fix or takes too long compared to an external patch antenna, and if it is cloudy it can only get the time or nothing at all. Since matching has been solved correctly and I followed design rules of clearance below the antenna and size of the board,
a) How deep the clearance below the antenna should be? As you can see in the image, I have nothing under the antenna for at least 1.6mm before my metal structure is present
b) Antennas work only one at a time, could it be that radiation pattern changed dramaticaly due to the metal structure?
c) Do you have other type of GNSS antenna with higher gain on top side of the antenna, so it is no longer omnidirectional?
Thank you for your advice in advance.
Antenna Engineer at Antenova Yu Kai is an antenna expert with over 10 years of experience in the design and testing of antennas. He has experience helping customers with certification testing, combined with his knowledge of RF measurement procedures.