Kurudere, S.Ertürk, Vakur B.2016-02-082016-02-082014http://hdl.handle.net/11693/27219Date of Conference: 6-9 October 2014Conference Name: 44th European Microwave Conference, EuMA 2014A novel configuration for substrate integrated waveguide (SIW) based bandpass filter with interdigital type resonators is presented. In the proposed structure, interdigital type resonators consisting of vias and circular caps at top of them are combined into a bowtie SIW structure. SIW is fed by a tapered microstrip line transition providing low loss and good matching. In order to improve harmonic suppression performance of the filter, the dumbbell shaped defected ground structure (DGS) is etched to the ground side of the microstrip line feeding section. The proposed filter structure is put in a conducting box in order to improve attenuation levels at the band edges and prevent radiation to the outside. The prototype is designed at 9 GHz center frequency with 500 MHz bandwidth, analyzed and fabricated for verification. The measurement results are in good agreement with the simulations, and the filter exhibits more than 30 dB harmonic suppression.EnglishBandpass filtersDefected ground structuresHarmonic analysisMicrostrip linesMicrowave circuitsOptical resonatorsResonatorsWaveguide filtersWaveguidesAttenuation levelsCenter frequencyFilter structuresHarmonic suppressionInterdigitalMicrostrip-line feedingSIW filtersTapered microstrip linesSubstrate integrated waveguidesConference Paper10.1109/EuMC.2014.6986567