Implementation of a Fourth-Order Compact Quasi-Elliptic Substrate Integrated Waveguide Filter in C-Band

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 ۵.۰۳ GHz and ۶.۲۶ 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 ۵.۵ GHz. The perfect bandwidth is ۰.۷ GHz. It is realized on a single-layer substrate from Rogers Ro۴۰۰۳. The Thickness of the substrate is considered as ۰.۵۰۸ mm. The measured outcomes of this filter, which show an excellent selectivity, and a low insertion loss of about ۱.۹ 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.

Keywords:

Substrate Integrated Waveguide (SIW) , Quasi-Elliptic Filter , Band Pass Filter (BPF) , Electric Coupling , Magnetic Coupling