Title :
A modified doublet bandpass filter with substrate integrated waveguide -to- defected ground structure cell for bandwidth enhancement and source-load coupling
Author :
Huang, Yong Mao ; Shao, Zhenhai ; You, Chang Jiang ; He, Zhaosheng
Author_Institution :
School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Abstract :
In this paper, a substrate integrated waveguide -to- defected ground structure (SIW-DGS) cell is proposed and used to implement a symmetric modified doublet filter. The utilization of proposed SIW-DGS cell can increase the coupling strength of the master transmission path in filter, thus resulting in the enhancing of bandwidth. And the source-load coupling generated by SIW-DGS cells can also improve the tuning flexibility of transmission zero. Measured results of the filter are in good agreement with the simulated ones, with a central frequency of 32GHz and a fractional bandwidth of 8.02%, as well as a transmission zero at 34.5GHz with notch strength over 55dB, and stopband with rejection below 25dB up to 50GHz.
Keywords :
Bandwidth; Cavity resonators; Coplanar waveguides; Microwave theory and techniques; Topology; Wireless communication; bandpass filter; defected ground structure (DGS); modified doublet; source-load coupling; substrate integrated waveguide (SIW);
Conference_Titel :
Microwave Conference (APMC), 2014 Asia-Pacific
