... goods or person attached with RFID tag go through the channel, RFID antenna will read the information and ... connection qty’4 SMA antenna ports, 9dbi circular polarization antenna, the height of antenna adjustableCommunication interfaceLAN,RS232,RS485, ... application routinesTag Operation PerformanceReading distance1.5-3m equipped with 7dbi antenna (tag dependent)Air interfaceEPC global UHF ISO-18000 ...