Gain Enhancement and SLL Reduction for TEXδ Mode by Inserting High Dielectric Constant Blocks

A novel technique is proposed to reduce the Sidelobe Level(SLL) of higher-order mode $\mathrm{T}\mathrm{E}^{x_{\delta51}}$($\delta$ is between 0 and 1) in Dielectric Resonator Antenna(DRA) and achieve boresight gain enhancement in this paper. By symmetrically inserting two rectangular dielectric blocks with higher dielectric constant at specific positions of the dominant radiation element with lower dielectric constant, the intensity ratio of the desired to unwanted E-field is increased, thereby weakening the SLL and enhancing the Main Lobe Level(MLL). The simulation results show that this method can achieve SLL reduction close to 4.67 dBi, while increasing the boresight gain by about 2.41 dBi.