Aiming at problem that traditional passive outer UHF partial discharge sensor has narrow band

low gain and easy to introduce noise

so an active outer sensor is designed based on active integrated antenna（ AIA）technology. Sensor receives electromagnetic wave signals by wideband antenna

amplify signal directly by active logarithmic detector on a dielectric plate. Omitting the balun and RF transmission line in traditional design

and loss of antenna is reduced

band

signal to noise ratio and gain are improved. Test results shows that the sensor has 900MHz center frequency

the band is 760MHz

1. 05GHz when VSWR is less than 2

peak value of sensor output signal is 5V with frequency of 2

10MHz. The se

nsor has strong antijamming capability and high gain

which is suitable for GIS partial discharge detection.