Miniaturized Reconfigurable Conductor-Backed Coplanar Waveguide Bandpass Filter

In this paper, we present the analysis and design of a miniaturized reconfigurable bandpass filter based on a 3
^rd
order coupled conductor backed coplanar waveguide transmission line structure. The main objective of the paper is to provide a comprehensive design analysis, development and optimization of miniaturized bandpass filter with application in the RF/Microwave and other wireless communication systems. The proposed miniaturized reconfigurable bandpass filter is specifically designed for wireless communication at the center frequency of 30 GHz. The conductor-backed coplanar waveguide design approach allows for the elimination of via holes; hence, easy to fabricate, cost effective and reduces parasitic in the filter. The transmission lines are patterned on a silicon dioxide placed on a silicon substrate with the dielectric constant of ε
_r
= 11.9. The filter occupies total chip area of 1.3 mm x 0.76 mm. The 3D structure is designed and simulated in CST. The result shows the achieved inband insertion loss of less than 2 dB and return loss better than 15 dB.