Development and Characterization of Narrowband BPF Made of Substrate Integrated Waveguide

The utilization of substrate integrated waveguide (SIW) structure has penetrated into numerous applications for radio frequency devices. This paper discusses the development of narrowband bandpass filter (BPF) made of SIW structure for 5 GHz band wireless communication application. The proposed filter is designed on a Duroid 5880 dielectric substrate with the thickness of 1.575 mm and the total dimension of 36.5 mm (length) by 19 mm (width). The characterization is conducted by simulation software to investigate and analyze the effect of different parameters of SIW BPF to the output response. Meanwhile, parametric studies as part of characterization process are applied upon the proposed filter to obtain the optimum design of filter architecture. The results of characterization show that the proposed narrowband SIW BPF with the input/output impedances of 50 Ω has the bandwidth characteristic of 84 MHz in the frequency range of 5.827 GHz to 5.911 GHz with a good frequency selectivity suitable for the desired application.