I'm currently design a 4layers pcb with 50r trace for an Ceramic chip antenna (on top layer). Due of a lot of trace, my trace antenna is a coplanar. Trace on top layer with polygon pour around AND internal_plane_1 (just below) connected to gnd.
The calculation: [https://chemandy.com/calculators/coplanar-waveguide-with-ground-calculator.htm[1 With E = 4 / S = 0.37 / W = 0.154 / h = 0.2. Impedance >> 50.0r
My question. We see often impedance controled track with Top and Bot layer, rarely with top and internal plane. is there a contraindication ?