In this article, we developed a dual-band band-pass filter (DB-BPF) based on stepped impedance resonators (SIRs) using coupled feeding lines input and output ports. The developed filter allows the adjustment of the frequency and the bandwidth of the upper band (3.8 GHz) and the lower band (2.4 GHz). The transmission coefficients of the DB-BPF are improved by maximizing the coupling between the SIRs. Furthermore, the capability of the rejection band is increased and the insertion losses between the two pass-bands are reduced. The experimental results for the insertion loss (S 21 ) and the return loss (S 11 ) of the lower band (2.4 GHz) were1.0 and 2.0 dB, respectively while the insertion loss and return loss for the upper band (3.8 GHz) were 23 and 25 dB, respectively. The 3 dB fractional bandwidths obtained for both bands were about 200 MHz and four transmission zeros around the passband edges were created to improve the selectivity of the DB-BPF. The overall size of the DB-BPF was also reduced significantly.

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In order to reconstruct a 3D model in video sequences

In this article, the miniaturized narrow band‐pass filter (BPF) with 90° short stubs using a U‐shaped folded transmission line is suggested. A U‐shaped transmission line is adopted instead of a conventional transmission line to reduce the size of the BPF on the low dielectric substrate. The size of the conventional narrow BPF is reduced by more than 70% due to the reduction of the length of the transmission line within the inverter. The experimental results show that the insertion loss and return loss are 1.61 dB and 15.4 dB, respectively, with bandwidth of 5% at the center frequency of 5.8 GHz. The designed BPF shows a harmonics rejection up to third (3f0) and fifth (5f0), with more than 18 dB rejection level in the simulation and experimental results. The size of the filter is 19 × 8.6 mm2. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2862–2865, 2015

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