Erkelenz, KevinKevinErkelenzSielck, NoahNoahSielckSieganschin, AntonAntonSieganschinKölpin, AlexanderAlexanderKölpinJacob, ArneArneJacob2022-12-052022-12-052022-0924th International Microwave and Radar Conference (MIKON 2022)http://hdl.handle.net/11420/14265This contribution discusses means to achieve high stopband rejection in bandpass filters. For compactness, the latter rely on dual-mode operation and a realization in folded substrate integrated waveguide (FSIW) technology. To obtain an asymmetric second-order response with two transmission zeros (TZs) in the lower stopband, the design combines a doublet of two resonant modes and a non-resonating node (NRN) with different perturbation means. The validity of the approach is demonstrated around 20GHz with two second-order filters with differently spaced TZs and a cascaded fourth-order version. These feature a -10dB reflection bandwidth (insertion loss) of 1.1GHz (1.9dB), 1.2GHz (2.0dB), and 1.6GHz (3.3dB), respectively. With stopband rejection ratios between 39dB and 58dB, the filters satisfy image noise suppression requirements in satellite communication (SatCom) receivers. Their surface area of about 5x6mm2 and less complies with the severe spatial constraints in SatCom phased arrays.enAsymmetricdoubletdual-modefilterfolded substrate integrated waveguide (FSIW)image rejectionnon-resonating node (NRN)phased arraytransmission zero (TZ)Conference Paper10.23919/MIKON54314.2022.9924918Other