RF is a very deep and broad subject. Check out some more technical writing with blogs and articles
Microstrip and Stripline - The Backbone of RF PCB Technology (Aminext, 1/30/26)
Why Maxwell's Plane Wave Solution Matters in RF (Featured in ITEM 2026, Interference Technology, 4/27/26)
Evaluating Patch Antenna Printed Circuit Boards Utilizing RF Absorber and S11 Measurements (Interference Technology, 6/1/26)