Sami, AbdulGómez Laso, Miguel ÁngelLopetegui Beregaña, José MaríaArnedo Gil, IsraelCalero Fernández, IbaiTeberio Berdún, FernandoMartín Iglesias, PetroniloBenito Pertusa, DavidArregui Padilla, Iván2022-05-252022-05-252022Sami, A., Gomez Laso, M.A., Lopetegi, T., Arnedo, I., Calero, I., Teberio, F., Martin Iglesias, P., Benito, D. and Arregui, I. (2022), Integrating multiple stubs in stepped-impedance filter aiming for high selectivity. Electron. Lett.. https://doi.org/10.1049/ell2.1251710.1049/ell2.125171350-911X (Electronic)https://academica-e.unavarra.es/handle/2454/43021A design technique to include multiple and fully-controlled transmission zeros (TZs) in the frequency response of rectangular waveguide commensurate-line stepped-impedance filters is presented in this letter. These bandpass filters (BPFs) are known for having reduced sensitivities against manufacturing inaccuracies and are composed of multiple waveguide sections. In order to improve their selectivity, 3λg/4 and λg/4-stubs are included to create multiple TZs around the passband. The proposed technique allows us to add multiple stubs in a single section and, therefore, only minor adjustments in the affected part of the filter are required, which simplifies the overall design process. The technique has been verified with a design example with four TZs (two on each side) near the passband.3 p.application/pdfeng© 2022 The Authors. This is an open access article under the terms of the Creative CommonsAttribution License, which permits use, distribution and reproduction inany medium, provided the original work is properly cited.Waveguide filterStepped-impedance filterBandpass filterTransmission zeroStubArtículo / ArtikuluaAcceso abierto / Sarbide irekiainfo:eu-repo/semantics/openAccess