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)
`stripLine`	Create a transmission line in stripline form (Since R2024a)
`coupledStripLine`	Create coupled transmission line in stripline form (Since R2024a)
`stripLineCustom`	Create a coupled single-ended or differential transmission line in strip form (Since R2024b)

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)

Featured Examples

Design and Analyze Transmission Line in Shielded Enclosure

Design and analyze a transmission line with a shielded enclosure. PCBs often experience unwanted problems such as electromagnetic interference (EMI) leading to performance degradation and failure. This might affect other sensitive electronics due to outgoing EMI. In an ideal world, a shield would completely block off these EMI and ensure that strong signals cannot escape. A microstrip enclosed in a Faraday shield is designed and analyzed using Finite Element Method (FEM). This example also examines an impact of the height of a shielding box and the added metal where a pin from a coax can sit on.

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Dual-Fed Square Microstrip Patch Antenna for BLE Applications

Design and analyze the dual-fed square microstrip patch antenna for Bluetooth Low Energy applications.

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Prototype, Design, and Analysis of SIW based Microstrip Tapered Transmission Line

Design and analyze a Substrate Integrated Waveguide (SIW) microstrip transmission line using Gerber files.

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Design Two-Stage Low Noise Amplifier Using Microstrip Transmission Line Matching Network

Use the RF PCB Toolbox™ shapes and the pcbComponent object functionality to design a two-stage low noise amplifier (LNA) for a wireless local area network (WLAN) with an input and output matching network (MNW) to maximize the power delivered to the 50 ohm load.

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