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designing matching networks in rf systems

matching networks in rf system enable maximum power transfer from the source to the load. you can design a set of circuits that match the impedance of a source to the impedance of a load at a specific center frequency using the matchingnetwork object or the app. you can also use the object and the app to visualize, and compare matching networks for the one-port loads.

using the object and the app, you can also:

  • design two- and three-component lumped-element matching networks at desired frequencies and unloaded-q factors.

  • provide source and load impedance as a one-port touchstone file, scalar impedance, rf circuit object, rf network parameter object, antenna toolbox™ object, or as an anonymous function.

  • sort matching networks using constraints such as operating frequency range and power wave s-parameters.

  • plot power wave s-parameters [1] of the matching network on a smith™ chart and cartesian plot.

  • plot voltage standing wave ratio (vswr) and impedance transformation plots.

  • plot magnitude, phase, real, and imaginary parts of power wave s-parameters of the matching network.

  • export selected networks as circuit objects or power wave s-parameters as sparameters objects.

available configuration

you can design matching networks in these network configurations:

  • pi topology

  • t topology

  • l topology

  • three-components

design workflows

you can design matching networks for rf systems using these workflows:

  • design matching networks for passive multiport network — this workflow shows how to design matching networks for 16-port passive networks at 39 ghz for 5g mm wave systems. you design a matching network for each port that functions between two 1-port terminations.

  • design broadband matching networks for antennas — this workflow shows how to design a broadband matching network between a resistive source and inductive load using optimization with direct search methods.

  • — this workflow shows how to verify the design of input and output matching networks for a low noise amplifier (lna) using a gain and noise figure plot.

  • design broadband matching networks for amplifier — this workflow shows how to design broadband matching networks for a lna.

  • (rf pcb toolbox) — this workflow shows how to design a quarter-wave transformer for impedance-matching applications using pcbcomponent, microstripline, and tracerectangular objects.

references

[1] kurokawa, k. “power waves and the scattering matrix.” ieee transactions on microwave theory and techniques 13, no. 2 (march 1965): 194–202. https://doi.org/10.1109/tmtt.1965.1125964.

[2] ludwig, reinhold, and gene bogdanov. rf circuit design: theory and applications. upper saddle river, nj: prentice-hall, 2009.

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