Abstract
High-selectivity substrate integrated waveguide (SIW) cavity bandpass filter loaded with perturbing elements and resonators are designed for X and Ku band applications. This filter is constructed by combining a perturbing element and two stepped resonators (\(R_1\) and \(R_2\)) on either side of the perturbing element into a square SIW cavity for a third-order passband operation. First, the perturbing element-loaded SIW cavity causes different electric field distribution for two modes (\(TE_{110}\) and \(TE_{120}\)) compared to unloaded SIW cavity modes. The mode shifting of the SIW cavity loaded with and without perturbing elements is explained using eigenmode analysis. Next, the \(TE_{110}\) mode and \(TE_{120}\) mode of SIW cavity loaded with perturbing element is coupled using the two stepped resonators inside the cavity. The coexistence of electric and magnetic coupling between the resonators (\(R_1\) and \(R_2\)) and the central perturbing element produces three poles that improve the proposed filter’s bandwidth. The generation of three transmission zeros improves the selectivity of the filter to a greater extent. The filter offers a broader bandwidth of 1.76 GHz with a center frequency 11.66 GHz. The fabricated filter uses an RTduroid 5880 substrate of size 18.5 \(\times\) 18.5 \(\times\) 0.51 \(\hbox {mm}^{3}\). The benefits of the filter are compactness and a more straightforward structure without performance negotiation. The developed filters present approach is validated by fabrication and measurement.
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Namanathan, P., Nagarajan, G. Realization of dual-mode, high-selectivity SIW cavity bandpass filter by perturbing circular shape vias. Appl. Phys. A 128, 773 (2022). https://doi.org/10.1007/s00339-022-05918-x
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DOI: https://doi.org/10.1007/s00339-022-05918-x