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Bamboo belongs to subfamily Bambusoideae of the grass family and is one of the most important non-timber forest resources in the world. The AP2/ERF superfamily is a group of plant specific transcription factors and plays important roles in the regulation of plant growth and responses to biotic and abiotic stress. By comprehensively analyzing the recently uncovered whole genome sequence and full length...
This letter designs a microstrip dual-band bandpass filter (BPF) based on hairpin resonators using T junctions I/O structure. Firstly it presents the principle of T junctions based on a diplexer. Secondly, the method of designing single-band BPF based on hairpin resonators is introduced. By using a T junction to connect two single-band BPFs, the influence from each filter is reduced. Then a dual-band...
This paper presents a compact balanced bandpass filter (BPF) with wide stopband. Firstly, it presents the equivalent circuits of the balanced BPF. By utilizing merits of the used resonator and open stubs centrally loaded, a balanced BPF with wide stopband and miniaturization can be achieved. Finally, a microstrip balanced BPF working at 2 GHz is designed and fabricated. Measured results accord well...
Two novel compact ultra-wideband (UWB) bandpass filter is developed by using two kinds of stub-loaded triple-mode resonator doublets. The proposed doublet consists of two parallel but oppositely arranged stub-loaded resonators. An UWB filter is designed by cascading three doublets, and eleven transmission poles are obtained in its passband. The high-orders filter has a passband covering 3.4–10.4 GHz,...
In this paper, a S-band bandpass filter was proposed with stopband performance enhanced by metamaterial units, complementary split ring resonators (CSRRs). This filter was composed by multiple stepped impedance resonators which made first spurious peak appear at frequency about four times the operation frequency. The CSRRs were then used to suppress the spurious band by embedding them in the input...
Using split-step fourier transform method solving parabolic equation is an effective method for predicting radiowave propagation above earth surface. In this paper the backward difference is adopted to improve the discrete mixed fourier transform algorithm, shift map method is also introduced to consider irregular terrains. Radiowave propagation is then predicted under vacuum and non-vacuum air conditions...
In this paper, a wide stopband bandpass filter was proposed. The proposed filter is composed of microstrip stepped impedance resonators (SIRs), two open stubs of different lengths are loaded at the center of some of the resonators to suppress the harmonic frequencies, thus makes the filter have a so wide stopband. Measured results accord well with simulated results, showing good performance of the...
A combined method is presented in this paper to truncate the upper domain in long range radiowave propagations for Fourier Split-Step (FSS) algorithm. This method uses different absorb function in different propagation range, thus makes the reflections caused by the upper domain truncation become nearly invisible. Example shows the advantage of the proposed method.
In this paper harmonics of bandpass filters constructed by open loop resonators were suppressed by choosing appropriate positions of the tapping feedlines. Simulated and measured results show the validity of this method.
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