Semnan University Press Journal of Modeling and Simulation in Electrical and Electronics Engineering 2821-0786 2 2 2022 08 01 Implementation of a Fourth-Order Compact Quasi-Elliptic Substrate Integrated Waveguide Filter in C-Band 23 27 7310 10.22075/mseee.2022.26905.1099 EN Narges Kiani Shariati Technical and Vocational College, Tehran, Iran. 0000-0002-3947-4671 Majid Afsahi Faculty of Electrical and Computer Engineering (ECE), Semnan University,Semnan,Iran. 0000-0001-9755-8905 Farzad Tavakkol Hamedani Faculty of Electrical and Computer Engineering (ECE), Semnan University,Semnan,Iran. 0000-0002-1085-1752 Pejman Rezaei Faculty of Electrical and Computer Engineering (ECE), Semnan University,Semnan,Iran. 0000-0002-1266-3229 Journal Article 2022 04 18 Substrate Integrated Waveguide (SIW) technology by application of the planar construction process obtains a catchy means for integrating planar and nonplanar circuits. Further, it is hard to realize the negative coupling needed to create a compact quasi-elliptic bandpass filter based on a single-layered SIW structure. The presented work proposes a specific planar and negative coupling configuration that provides two transmission zeroes at 5.03 GHz and 6.26 GHz. This article presents a fourth-order quasi-elliptic filter. The proposed filter is also wide-band. This structure is implemented in SIW knowledge. The SIW filter has a central frequency of 5.5 GHz. The perfect bandwidth is 0.7 GHz. It is realized on a single-layer substrate from Rogers Ro4003. The Thickness of the substrate is considered as 0.508 mm. The measured outcomes of this filter, which show an excellent selectivity, and a low insertion loss of about 1.9 dB, agree suitably with simulation results. The designed filter's innovation provides these features: compact, low cost, wide-band, good selectivity, low insertion loss, and agreement between simulation and fabrication. https://mseee.semnan.ac.ir/article_7310_e5a90182cc81e12ab5e72d66e0b46fe3.pdf