Simulation and Design of a Bandpass Filter Based on Substrate Integrated E-Plane Waveguide

Abstract

This paper presents a bandpass filter based on a substrate integrated E-plane waveguide (SIEW) structure for wireless applications, at X-band. The SIEW geometry allows the development of new horizontally polarized filter topologies, unlike filter structures based on substrate integrated waveguide (SIW), which present vertical polarization (perpendicular to the ground plane). The simulation of the proposed SIEW filter is carried out using Ansoft HFSS software. To evaluate the performance of the proposed structure, the frequency behaviors of the scattering parameters are obtained for a horizontally polarized excitation. In the simulation, analyses are performed for the lossless and lossy (dielectric and metallic) cases, in order to compare the obtained results. The SIEW filter is fabricated and measured using a vector network analyzer (VNA). Measurement results are in agreement with simulation ones, validating the proposed filter design and topology. The fabricated prototype resonates at 10.54 GHz, with a bandwidth of 1.20 GHz, defined for a-3 dB transmission coefficient reference level. The SIEW filter structure is easy to design and manufacture and can be used in wireless communications systems that require components with ease integration into other planar structures.

A Novel Tri-bandpass Filter Side-coupled Square Ring Based

“…The methodology based on mode analysis is also applicable in the development of bandstop structures [21]. Techniques such as the use of Substrate Integrated Waveguide (SIW) structures to improve filter performance [22] - [23] are also valid. Much of the research involving microwave filters commonly seeks the development of performance bandpass planar circuits with one or more transmission bands and high frequency selectivity, as well as high attenuation rates in reject bands.…”