Design of a dual-mode bandpass filter with wide stopband performance for GPS application

In this article, we propose a dual-mode bandpass filter (BPF) at 1.575 GHz using periodic meander slotted ground structures (M-SGSs) which are etched on the ground plane for spurious suppression. First, single M-SGS is analyzed. Second, the M-SGSs are used to provide a good stopband-rejection to the second harmonics of the dual-mode BPF with level of over −40 dB. Finally, a dual-mode BPF with improved stopband is designed, fabricated, and measured. The experimental results of the fabricated filter measured by the network analyzer have good agreement with the simulation results. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 445–447, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23123