Parametric study of the effect of annular slot on the operating frequency of solid cone antenna

Abstract

The concept of adding slots to solid cone antenna is described in this paper. Effects of slot-depth, slot-width and slot-position on the operating frequency of the conical antenna are investigated. Annular slots on the antenna produced stopbands with anti-resonant frequencies that are inversely proportional to the depth of the slots such that deeper slot produced anti-resonance at lower frequency band while the relatively shallow slot produced anti-resonance in a higher frequency band. The increase in the slot-width caused a corresponding increase in the bandwidth of the stopband but the slot-depth has a stronger effect on the operating frequency of the cone. Prototype antennas were fabricated and measured to verify the simulated results.