Design of new shape printed bowtie antena for ultra high frequency partial discharge sensor in gas-insulated substations

Detection of partial discharge (PD) with an antenna as ultra high frequency (UHF) sensor at a frequency of 300 MHz - 3 GHz has been widely used and proven to be an effective away for diagnosis of insulation in gas insulation switchgear (GIS). Various types of antennas have been developed to obtain better sensitivity and accuracy in the UHF bandwidth range. Bowtie antenna can be used as a sensor because it has the characteristics of ultra wide band (UWB). Sensitivity antenna greatly affects the ability of the sensor to detect the electromagnetic signals (EM) from source PD. Return loss (RL) used as a parameter to see the sensitivity of the antenna because it has a better resolution to see the reflected signal. This study new shape bowtie antenna to get better sensitivity. Influence edge modification and sliced modification will be discussed and simulated in antenna design. Simulation results show modification edge and sliced bowtie antenna able to produce optimal sensitivity antenna with a radius of 18 mm and 16 mm. The technique led to the reduction of the antenna surface significantly.