(Usually, the impedance matching at a certain frequency point can be carried out by using the SMITH chart tool, and the two devices can definitely be done, that is, the impedance matching from any point on the chart to another point can be terminated by a series + parallel inductor or capacitor, but this is single frequency. The mobile phone antenna is dual-frequency, matching one of the frequency points will definitely affect the other frequency point, so the impedance matching can only be a compromise between the two frequency bands.)
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