The impedance specifications of the antenna are generally 50 Ω and 75 Ω. Therefore, an antenna with an impedance of 50 Ω must be selected to achieve the best match in signal transmission. The characteristic index is usually the input reflection coefficient or the voltage standing wave ratio (VSWR). It is shown that an antenna with good impedance characteristics generally has an input reflection coefficient of less than -10 dB or a voltage standing wave ratio of less than 2:1.
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