Abstract
In this paper, a novel circular cross-coupled dielectric waveguide filter is designed based on 45-degree sectoral waveguide resonators. The filter is composed of eight identical resonators with a tuning blind hole arranged above each resonator. The positive coupling is realized by the combination of a partition wall and shallow blind hole, and the negative coupling is realized by the combination of a partition wall and a deep blind hole. The filter finally realizes an excellent performance with a center frequency of 3.5GHz, a passband bandwidth of 260MHz, an in-band return loss of more than 19dB, two steep transmission zeros at 3.31GHz, and 3.7GHz respectively, and a remote suppression of more than 40dB. In this design, the dielectric waveguide is used to successfully realize the miniaturization of the filter. The designed filter can be applied to the base station in 5G band.
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