Broadband planar helical antenna for detecting partial discharge of electrical equipment and design method thereof

The invention discloses a broadband planar helical antenna for detecting the partial discharge of electrical equipment and a design method thereof. The antenna comprises a medium substrate, a grounding plate and an antenna conductor layer, wherein the grounding plate and the antenna conductor layer are respectively laid on both sides of the medium substrate, and the antenna conductor layer comprises a single-arm Archimedes helical conductor and a sine wave-shaped helical conductor. The design method comprises the steps of determining basic parameters, determining initial track parameters of the antenna conductor layer, determining the standing-wave ratio and return loss of the antenna under the initial parameters of initial track calculation of the antenna conductor layer and determining optimum parameters. According to the broadband planar helical antenna and the design method, a mode that the single-arm Archimedes helical conductor and the sine wave-shaped helical conductor are combined is adopted, so that the radiation length is effectively extended, the frequency bandwidth is increased, and good antenna characteristics are guaranteed. The broadband planar helical antenna which is used as a signal detection sensor of the electrical equipment has a plurality of detection bands within a range of 0.3 to 3 GHZ and has the characteristics of good directivity, wide frequency band, convenience in impedance matching, small size and the like.