Wideband slot-coupled dielectric resonator-based filter

A simple and novel slot-coupled dielectric resonator-based filter (DRF) with wideband performance is proposed, and the designed geometric parameters of the filter are discussed in detail. The proposed filter comprises a substrate, a microstrip line, and three dielectric resonators (DRs), which are positioned on the center of the corresponding slots to obtain a wide stopband response. Numerical simulations show that the wideband DRF has a center frequency of 6.5 GHz, which is consistent with the experimental measurement results. The simulation, as well as the experimental results demonstrate that the distance between the adjacent DRs is a key parameter that can be used to tune the bandwidth of the wideband DMF. The physical mechanism of the DRs is also revealed through analysis of the electromagnetic field distribution results. Additionally, the influence of the DRs on the stopband frequency is also discussed. The results indicate that the DRs play a critical role in the proposed filter. Furthermore, this paper presents the first report on a wideband DRF. (C) 2019 Elsevier B.V. All rights reserved.