Design and Analysis of Bandpass Filter using SIW Techniques and CPW Feed

Abstract

In the proposed work, the design and analysis of a bandpass filter (BPF) using substrate integrated waveguide (SIW) technique along with conductor backed coplanar waveguide (CB-CPW) is presented. The design structure is simulated, followed by its analysis, and finally, its results are experimentally verified. The design method is used as a simple approach to obtain the second-order BPF and two transmission poles for 12-18 GHz frequency range. At the first step, the input impedance of the CB-CPW feed is calculated and fixed as 50-ohms. Apart from this, two-cavity resonators are created by using four vertical metallic walls to generate resonant frequencies and two poles, which means the second-order filter is developed. Furthermore, the gap between two metallic walls plays a crucial role in maintaining the filter's impedance bandwidth and other characteristics. The experimental results of filter characteristics are verified and matched with the results of the simulation.