Method of communications in a backscatter system interrogator, and backscatter communications system

(57) Within a summary backscatter system, are an appeal machine (26) to be used and this appeal machine (26), Connect with the antenna (R1) constituted so that a backscattered signal might be received, and its antenna, and a backscattered signal Frequency 逓降して, IQ frequency 逓降 converter constituted so that I signal and a Q signal might be generated, It has the coupler constituted so that it might connect with the IQ frequency 逓降 converter, I signal and a Q signal might be combined and a combined signal might be generated, and the analog-to-digital converter constituted so that it might connect with the coupler and a combined signal might be changed into a digital signal. It is a correspondence procedure of a backscatter system, and by the method, a backscattered signal is received, a frequency 逓降して I signal and a Q signal are generated for the backscattered signal using IQ frequency 逓降 converter, the I signal and Q signal are combined, a combined signal is generated, and the combined signal is changed into a digital signal.