# Transmission Lines

Microstrip lines, coplanar waveguides

Use the transmission line objects and functions to create and visualize different types of transmission lines used on a printed circuit board (PCB).

RF and microwave transmission lines connect different components on a PCB board. They allow signals to flow between the components. There are various types of transmission lines and they all have unique geometries and satisfy different requirements when used on a PCB. A well-designed transmission line reduces the insertion loss in an RF system and improves the circuit performance.

## Apps

 Transmission Line Designer Design, visualize, and analyze transmission lines (Since R2023a)

## Objects

 `coplanarWaveguide` Create coplanar waveguide transmission line (Since R2021b) `microstripLine` Create transmission line in microstrip form (Since R2021b) `coupledMicrostripLine` Create coupled microstrip transmission line (Since R2021b) `microstripLineCustom` Create coupled form of single or differential microstrip transmission line (Since R2022b) `SIWLine` Create an SIW line in microstrip form (Since R2023b)

## Functions

 `show` Display PCB component structure or PCB shape (Since R2021b) `info` Display information about PCB component structure (Since R2021b) `pcbcascade` Create new component using cascade operation (Since R2021b) `propagationDelay` Compute propagation delay of transmission line (Since R2022b) `layout` Plot all metal layers and board shape (Since R2021b) `shapes` Extract all metal layer shapes of PCB component (Since R2021b) `rlgc` Compute resistances, inductances, conductances, and capacitances (Since R2022b) `getZEven` Calculate even mode impedance of differential PCB transmission line (Since R2022b) `getZOdd` Calculate odd mode impedance of differential PCB transmission line (Since R2022b) `dgs` Create defected ground structure of PCB element (Since R2023a)