Bandpass characteristics of substrate integrated waveguide loaded with Hilbert curve fractal slot

Abstract

This paper presents an investigation on the design of miniaturized substrate integrated waveguide unit cell loaded with Hilbert curve fractal slots. It has been found that the proposed structures exhibits a passband which is well below the cut off frequency of the substrate integrated waveguide and hence, can be used in the design of miniaturized filter. Different orientations of the Hilbert curve are investigated and an optimum orientation which gives the best passband response is found. A simple two stage filter based on that particular orientation of Hilbert slot is also presented in the paper.

Bandpass Filters Based on Hybrid Structure of Substrate Integrated Waveguide (Siw) and Hilbert Defected Ground Structure (Hdgs)

“…After that, their applications were extended for the other components. The advantage of using a Hilbert curve as a resonator is that we can get diverse responses simply by varying line-to-spacing ratio and the orientation of the curve [8,9]. To improve the performance of components, Many papers have treated the combination between SIW and DGS [10,11].…”