DEVELOPMENT OF DUAL-BAND BANDPASS FILTER BASED ON SUBSTRATE INTEGRATED WAVEGUIDE AND ARTIFICIAL DIELECTRIC MATERIAL

• Main Author: Ikhyari, Ahmad
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/55823
• Institution: Institut Teknologi Bandung

Substrate-integrated waveguide (SIW) is integrated waveguide-like structures Jabricated by using two rows of conducting cylinders or slots embedded in a dielectric substrate that electrically connect two parallel metal plates. An artificial dielectric material (ADM) is a fabricated composite material, usually an array of conductors embedded in a supporting nonconductive structure, designed to have electromagnetic properties like those of a dielectric. This thesis presents the physical characterization of SIW, in the form of microstrips, which was developed based on ADM. The SIW structure is implemented using a regular arrangement of via tubes, which hollow out, perforate the entire layer of the structure, which is later filled with cylindrical copper wires. The arrangement of the tubes resembles the walis of a waveguide. Meanwhile, the ADM structure is similar in shape to the SIW, but without any contact with the copper patch and copper ground plane, of Course with a cylindrical wire fill that is shorter than that reguired for the SIW structure. The ADM arrays are laid perpendicular, from a patch or ground plane perspective to the SIW array. Both SIW and ADM structures are embedded through the FR4 Epoxy dielectric substrate with a relative permittivity of 4.4 and a total thickness of 3.2 mm. The characterization results show that, in general, the installation of the SIW via-via increases the overall freguency response because of the narrowing of the electromagnetic wave motion space in the substrate. However, the augmentation of the initial ADM structure on the SIW filter reduces the lowest resonant freguency response from 2.3 GHz of withoutADM SIW filter and increases the nearest higher freguency response from 2.9 GHz. Furthermore, the application of the two-stage ADM structure provides a good dual-band freguency response. The gradual reduction scenario of the ADM tubes allows setting the Jreguency response to approximate the application at the desired single or multiple Jreguencies, even though further precise implementations are expected.