The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. The terms “comprise”, “comprises”, “comprised” or “comprising”, “including” or “having” and the like in the present specification and claims are used in an inclusive sense, that is to specify the presence of the stated features but not preclude the presence of additional or further features.

The present technology generally relates to an antenna sensor and/or a detecting device having the antenna sensor. In particular, the present disclosure provides a class of antennas used for Partial Discharge (PD) detection and localization, and size reduction of Ultra-High Frequency (UHF) Antennas for partial discharge detection.

Radio Frequency (RF) applications are utilized in the detection of Partial Discharge (PD) phenomenon. Ultra-High Frequency (UHF) has been given great attention due to the high reliability and effectiveness in detecting PD activities. For example, Ultra-High Frequency (UHF) technology is used for the detection of PD in medium and high voltage devices by collecting the emitted electromagnetic (EM) waves in the UHF range.

Nonetheless, given that the UHF ranges from 300 MHz to 3 GHz, UWB antennas are required to detect such waves. The lower frequency range (300 MHz) is relatively low, and thus the size of antennas operating at such frequencies can be relatively large.