Substrate Integrated Waveguide With Defected Ground Structure For Microwave Filter Design

Mohammad Hanif, Mazlan (2012) Substrate Integrated Waveguide With Defected Ground Structure For Microwave Filter Design. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This paper presents novel designs of Substrate Integrated Waveguide (SIW) with Defected Ground Structure (DGS) for Microwave Filter Design. The first design of SIW is half mode substrate integrated waveguide (HMSIW) that possesses highpass characteristic of SIW but the size is nearly half reduced. Then the second design is an asymmetric defected ground structure (ADGS), composed of two square headed slots connected with a rectangular slot transversely under a microstrip line. Then both design combined and become half mode substrate integrated waveguide with asymmetric defected ground structure for microwave filter design. Substrate integrated waveguide is a waveguide that synthesize inside a substrate and the propagating wave is delimit by arrays of via holes [1]. While the defected ground structure behaves like a resonator by etching the ground plane of the SIW cavity [2]. This technique provides an excellent avenue to design millimeter wave circuits such as filters, resonators and antenna [3]. It can be easily connected to other planar microwave transmission lines and devices. Its features a high-pass characteristic of conventional waveguide with a high Q factor characteristic and has an advantage of compactness, good suppression characteristic and low cost. All simulation has been done by using Advance Design System (ADS) Momentum. Fabricating the design and test it with the simulated result will validate the simulation result with the theory. Standard PCB used because the cost of fabrication is cheap and reproducible.

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