I am a software engineer and I know nothing about hardware design....
Recently I am asked to collect some information about the components of RFID reader that can read ISO-18000-6 (Type A) tag. The tag works in the UHF band (860-930 MHz). I have some question but I don't have any friend that have RFID experience. I would really appreciate if you could kindly answer the questions below.....1) The operational principle of this kind of tag is "backscatter coupling". However, I am not sure how the reader distinguish the forward signal and the backscattered signal, which of the same frequency. I read some information from internet and someone mentioned about the "directional coupler". Is directional coupler really used in a typical UHF RFID reader? If so, could you kindly recommend a brand and the model number of directional coupler that can be used in RFID reader? 2) The reader is supposed to be used in a cashier of shop. The range of distance of the reader to the tag is about 30cm. Do you have some typical power values that the reader need to send and the power of the backscattered signal? I need this kind of figure because I was ask to choose the transceiver IC and I wonder if the power is enough. Do you have any recommendation of transceiver IC? 3) About the antenna. I found some paper mention about 4 phased array, which is good for sending RF signal in one direction. Have anyone used it before? If yes, where can I found it? Any brand name or model number recommend?
Thanks in advance.