According to an embodiment of the present disclosure, the antenna devices are planar types and are printed directly into Printed Circuit Boards (PCBs). PCB based antennas have many advantages, for example, including ease of fabrication, light weight, and low cost. The antenna device can operate with a quasi-constant impedance over a very large frequency band. This property is important in PD detection because the generated pulses in the event of PD have a short time-domain representation. Thus, the antenna devices cover a broad frequency spectrum reaching few GHz. In other words, such pulses have high energy components at high frequency components because of the rapid changes in a short period of time. The antenna device having a suitable size is configured to cover low frequency components. Thus, the antenna device is, for example, suitable for external PD detection in GIS. This could be done, for example, by placing the antenna device near one of the apertures made on the outer enclosure of the GIS to allow the electromagnetic waves to escape the enclosure. The placement of such sensors externally is similar to the placement of horn antennas used for external PD detection in the industry.