What type of transmission line is often used for connections to MMICs?

MMICs are typically small, surface-mounted components designed for high-frequency printed circuit boards (PCBs). Because of this physical layout, the transmission lines connecting to them must also be integrated directly into the PCB itself to maintain signal integrity. A microstrip is a type of electrical transmission line that can be fabricated using standard printed circuit board technology. It consists of a conducting strip separated from a ground plane by a dielectric layer, making it the perfect flat, compact transmission line to route RF signals directly to and from surface-mount MMICs. Other options like miniature coax or circular waveguide are bulky, separate physical structures. Parallel wire is entirely unsuitable for microwave frequencies due to massive radiation losses. Only a microstrip allows for seamless integration right on the circuit board alongside the MMIC.