Design of an Archimedean spiral UHF antenna for pulse monitoring application

In recent years, various research works have been carried out in the UHF partial discharge monitoring of power transformers. The proper design of decoupling UHF sensors is very important in this application. This paper presents a two-arm Archimedean spiral antenna with a ground plane and a double sided parallel feeding network as a sensor for the mentioned application. Due to some existing limitations in this context, the antenna design process is somewhat unique as compared to previous works in the general telecommunication area. The measured `10 dB´ return loss bandwidth is more than 3.8 GHz starting from 220 MHz. Finally, simulations and measurements results demonstrate the successful principle of operation of the proposed antenna.