Antenna tuner impedance detection method based on phase detection

Abstract

The invention relates to an antenna tuner impedance detection method based on phase detection. The method includes the following steps that firstly, the inductance coil coupling mode is adopted in a current sampling circuit, and a voltage sampling signal is acquired from a radio frequency link in a resistance voltage dividing mode; secondly, a circuit sampling signal and the voltage sampling signal are subjected to detection, amplifying and A / D sampling to acquire a current amplitude value and a voltage amplitude value; thirdly, shunt signals of the current sampling signal and voltage sampling signal are subjected to wave shaping through a comparator, a sine wave becomes a square wave, then the square wave is amplified, and a standard square-wave signal is acquired; fourthly, the phase of an impedor and the relation between the capacitive reactance and the inductive reactance of the impedor are judged through the voltage and current shaping square wave signals and a voltage and current square wave xor output signal. The method has the advantages that the input impedance of an antenna can be precisely measured, resource consumption is small, circuits are simple, the measurement speed is high and the tuning speed of an antenna tuner can be guaranteed.

Description

technical field [0001] The invention relates to equipment for wireless communication and radio wave propagation, in particular to a method for impedance detection of an antenna tuner based on phase detection. Background technique [0002] At present, with the development of communication technology, there are more and more applications of long-distance communication. Long-distance communication establishes link communication by transmitting high-power signals through antennas. The input impedance of the antenna radiating element is a function of the operating frequency, antenna type, antenna size and the surrounding environment. Its input impedance will change greatly with the changes of the above factors, while the output impedance of the transmitter power stage is relatively unchanged . If the transmitter is directly connected to the antenna, when the operating frequency of the transmitter and other factors change, the impedance between the transmitter and the ...

AI Technical Summary

Problems solved by technology

The impedance mismatch between the antenna and the feeder will cause part of the output power of the final stage of the transmitter sent by the feeder to be reflected back by the antenna, which will affect the normal working state of the final power amplifier, and may cause the final power amplifier to heat up and even burn out, reducing the power consumption of the final power amplifier. The emission efficiency of the system, and there are safety hazards at the same time

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