Study on Balun Miniaturized Flexible Archimedes Spiral Antenna for Partial Discharge Detection

At present, the UHF built-in antenna sensors used to detect partial discharge (PD) of high voltage electrical equipment are mostly rigid substrates, which cannot be conformal with the equipment arc shell during installation, resulting in low space utilization, and may have certain influence on the internal electric field of equipment. To solve these problems, in this paper, polydimethylsiloxane (PDMS), a flexible material, is used as the antenna base to simulate the feasibility of the flexible Archimedes spiral antenna for partial discharge detection in cylindric structure electrical equipment, and the longitudinal size of the antenna is reduced by 68.7
^%
by feeding the antenna with a bent miniaturized Balun. The simulation results show that the VSWR of the designed flexible Archimedes spiral antenna is less than 3 when the bending radius is 0, 200, 300, 400 and 500 mm in the 500 MHz~3 GHz band, and the designed flexible antenna has good bidirectional radiation characteristics in the full band range. The simulation results show that the flexible antenna is feasible for partial discharge detection in high voltage electrical equipment.