As an RF circuit designer, you make many critical printed-circuit-board (PCB) design decisions to ensure your circuit will function as intended. These decisions range from selecting the right materials to developing a board configuration that will limit common issues, including spurious-wave-mode propagation, conductor and radiation losses, unwanted resonance, and dispersion.
However, as your circuit's operating frequencies rise into the mmWave range (30 to 300 GHz), the interactions of these short-wavelength signals with the board and its environment become intensified compared with signals in the microwave range (3 to 30 GHz). So, the challenges of board configuration and material selection become even more complex and important to the end-product's performance.