A compact dual-band UWB filter based on the parallel line structure with the slot-line

In this letter, we proposed a compact dual-band UWB filter based on the parallel line structure with the slot-line (Thomson and Hong, 2007) to achieve a high channel selectivity due to transmission zeros located near the passband edge, which are produced by the all stop response introduced by the quarter-wavelength parallel-coupled line. Additionally, the wide passband response is excited by the U-shaped slot-line resonator (SLR) and further improved by shorted slot stubs to form the dual-band performance. The proposed wideband BPF, as shown in Figure 1, can exhibits good passband selectivity and out-of-band performances and is experimented to verify the design concept.