Design of a miniaturized spiral antenna for partial discharge detection system

Abstract

A miniaturized spiral antenna with a broadband balun for a partial discharge (PD) localization system is proposed. The proposed antenna has broadband characteristic from 925 MHz to 1.6 GHz and a unidirectional radiation pattern. The overall dimensions of the fabricated antenna are 80 x 80 x 40 mm(3), which is the smallest size among antennas for the PD detection system. The measured -10 dB reflection bandwidth starts at 925 MHz, and the measured directivity of the antenna is about 6 dB in the frequency band.