Design And Fabrication Of Substrate Integrated Waveguide Bandstop Filter

Siti Sabariah, Sabri (2011) Design And Fabrication Of Substrate Integrated Waveguide Bandstop Filter. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This paper presents the designs of Substrate Integrated Waveguide (SIW) bandstop filter. In order to give the bandstop response, this network comprises a Substrate Integrated Waveguide (SIW) cavity resonator which is coupled to a strip line. SIW are high performance broadband interconnects with excellent immunity to electromagnetic interference and suitable for use in microwave and millimeter-wave electronics, as well as wideband systems. They are very low-cost in comparison to the classic milled metallic waveguides as they may be developed using inexpensive printed circuit board (PCB) fabrication techniques. With the advent of SIW technology in microwave area, many circuits are designed based on these structures. SIW is synthesized by placing two rows of metallic via-holes in a substrate. The field distribution in an SIW is similar to that in a conventional rectangular waveguide. Hence, it takes the advantages of low cost, high Q-factor and can easily be integrated into microwave and millimeter wave integrated circuits. The transmission loss of the on substrate transitions may be much lower than that of the transitions or coupling sections made between the conventional waveguide and planar circuits. Whilst many researches using this technology are being carried out, this project proposes that instead of designing bandstop filter based on a SIW rectangular or square resonator. In order to develop a bandstop filter base on the SIW rectangular resonator, cavity resonator coupled to a strip line to give bandstop response. The microstrip probe was positioned in the middle of SIW resonator to ensure only the TE10 mode was excited. The size of the resonators, diameters of the metal posts and spacing of adjacent posts are consider based from with the length of the resonators approximate to a half guide wavelength long at the center frequency.

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