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how to match the trace in 50ohm impedance??

kabalee

 hi everyone ,

how to match trace for 50 ohm impedance in RF design perticularlly in antenna design routing section anybody please help for me 

is it trace impedance depends on  materias choosing ??

how to match 50 ohm impedance in antenna 

  • redwire

     This is an advanced subject so I would suggest searching Google.

    The design engineers should be aware of what materials they want and what construction you are looking to build.  There is no one answer as 50 ohm lines can be built in an infinite number of ways.

  • tomoo
    Generally, an antenna length is conformed with quarter-wavelength.
    Wavelength (m) = 300 / f (MHz, operating frequency)

    ex) f = 2.4GHz (2400MHz)
    Wavelength (m) = 0.125 (4.9inch)
    Quarter-wavelength (m) = 0.03125 (1.2inch)

    As simplified design,
    if you want an antenna loop pattern on a PCB, the trace length should be approximate 3cm (1.2inch) and tha trace width should have a value for 50 ohm impedance based on the layer construction and the material.

    However, the final antenna impedance matching in RF design should be designed by some chip capacitance or inductance added in the antenna pattern and by smith-chart and return-loss diagram using a network analyzer.
    Therefore, it doesn't mean that all you have to do is that match the antenna pattern with Z50 trace width.
    You will have to have a background in some of the RF and antenna designs.

    Hope this helps.
    Tom
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