Fifth generation wireless technology demands more from printed circuit board materials than any previous cellular standard. 5G base stations operate at frequencies ranging from sub-6 gigahertz up to millimeter wave bands above 24 GHz, with future e...
https://www.high-frequency-pcb.com/high-frequency-pcb-materials/top-5-high-frequency-pcb-materials-for-5g-base-station-applications/
RF and microwave circuit design pushes PCB technology to its frequency limits where conventional assumptions break down. At 10 GHz, 28 GHz, or 77 GHz, the physical dimensions of PCB features approach the signal wavelength, turning simple connection...
https://www.high-frequency-pcb.com/high-frequency-pcb-knowledge/key-high-frequency-pcb-knowledge-for-successful-rf-circuit-design/