COMPACT MULTILAYER DUAL-BAND FILTER USING SLOT COUPLED STEPPED-IMPEDANCE-RESONATORS STRUCTURE

摘要

In this article, a new miniaturized configuration of single-input-single-output dual-band bandpass filter operating at ISM 2.45 GHz and UNII 5.8 GHz frequency bands using a multilayer structure with stepped-impedance resonators is presented. A coupling aperture is introduced in a common ground to ensure the coupling between the two resonators located in the upper layer and the lower one. The use of stepped-impedance resonators allows tuning the two bands at desired frequencies. Finally, a design prototype was fabricated to validate the proposed concept. The insertion loss and return loss at the central frequency are -1.35 dB and -17 dB for 2.45 GHz band, and -0.98 dB and -13 dB for the 5.8 GHz band, respectively. There is a good agreement between experimental and full-wave electromagnetic simulation results.