Transmitter impedance indicator and impedance detection method

The invention discloses a transmitter impedance indicator, comprising a current sampling circuit which comprises a current sampling ring arranged around a transmitter output loop bus, a sampling ring winding around the current sampling ring, and a sampling resistor connected in parallel with the sampling ring winding, and is used for collecting a current signal on the bus and outputting the current signal; the voltage sampling circuit comprises a divider resistor which is connected in series with the bus and is used for collecting and outputting a voltage signal on the bus; and the impedance value indicating circuit comprises two paths of diode envelope detector loops, the current signals and the voltage signals are input into the two paths of diode envelope detector loops respectively, two paths of input differential comparators are formed, and the differential output of the two paths of input differential comparators represents the impedance of the bus in real time. The antenna impedance indicator can solve