The 5400AT18A1000 from Johanson Technology is a Antenna with Frequency 4.9 to 5.9 GHz, Gain -2.5 to 2.0 dBi, Power 0.5 W, Operating Temperature -40 to 85 Degree C, Storage Temperature 5 to 35 Degree C. Tags: Ceramic, Chip. More details for 5400AT18A1000 can be seen below.