This invention provides an
output impedance calculation device, which includes: a
control unit, an adjustment unit, a LORA transmitting unit, a first impedance calculation unit, a second impedance calculation unit, a matching unit, and a transmitting antenna. The
control unit is used to transmit
wireless signals; the LORA transmitting unit is used to convert
wireless signals into LORA signals; the first impedance calculation unit is used to calculate the
input impedance based on the LORA signals; the second impedance calculation unit is used to calculate the
output impedance based on the LORA signals; the
control unit is used to calculate the
reflection coefficient based on the input and output impedances, and to calculate the
standing wave ratio based on the
transmission coefficient; the adjustment unit is used to adjust the impedance in the circuit based on the
standing wave ratio and the
reflection coefficient, thereby achieving
impedance matching and balance between the input and output terminals of the line, improving the output quality of radio signals, reducing the overall output
power consumption, and reducing
harmonic interference.