This is the mask for a 5G antenna, especially for the n78 band (3.3 to 3.8 GHz)
This antenna is a part of a project on a 5G weather IoT device. A paper is available at: (link will be added soon)
The shield use to measure 5G wave : https://github.com/Louis-GUENEGO/ARDUINO-MKR-WAN-1300-5G-detector-shield
It is on a 1:1 scale on A4 paper. In the middle you should drill an hole and solder this (https://www.te.com/usa-en/product-1052522-1.html) to the plane.