A dual-wideband bandpass filter using open/shorted coupled lines

Abstract

A compact dual-wideband (DWB) bandpass filter utilizing open-shorted coupled lines (OSCL) is proposed in this paper. The introduction of the folded structure not only reduces the overall size but also contribute to the split of the transmission zero (TZ), which improves the selectivity effectively. Six transmission poles and five TZs are realized utilizing the shorted-circuit stub and OSCL. The characteristic of the flexible adjustment method of TZs guarantees an independently wide adjustable range of the bandwidth. For demonstration, a DWB filter (3 dB bandwidth 120 and 28%, respectively) is designed and fabricated. The filter is compact and has the characteristics of extraordinary wide bandwidth, low insertion loss, as well as high selectivity.

Dual Band BPF Based on Parallel Coupled Lines Loaded by Open Stubs for Ku-Band Satellite Applications

“…In modern wireless communications, there is a great need for dual band opera- There are several approaches reported in the literature to design an integrated dual band Band Pass Filter (BPF) [3] [4] [5] [6]. Cascading band stop filter and wideband BPF is a simple idea to generate dual band BPF [3].…”

“…Cascading band stop filter and wideband BPF is a simple idea to generate dual band BPF [3]. Also, open-shorted coupled lines (OSCL) are used to realize dual band BPF [4]. The overall size has been reduced using the folded structure and this contributes to the split of the transmission zero which greatly improves the filter selectivity.…”