A Novel Triple-Mode Wideband Slotline Antenna

In this paper, a novel triple-mode planar wideband sloltine antenna is presented. The proposed antenna starts from a traditional slot one, which only has a radiation mode and suffers from intrinsic narrow bandwidth. To deal with this problem, two pairs of short-ended slots are symmetrically etched along the traditional slot one near the maximum electrical field of its full-wave radiation mode. After suitably choosing the locations and parameters of the short-ended slots, extra two radiation modes can be introduced and merged with the full-wave one, resulting in a wideband characteristic with three resonances. To validate this, a triple-mode prototype is designed and experimentally measured. The experimental results agree well with the theoretical analysis and simulated ones verifying a simple designing approach of wideband slotline antennas with three radiation modes.