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A compact quad-band bandpass filter using semi-lumped resonators is presented. The proposed filter is composed of four pairs of semi-lumped resonators, which consist of microstrip sections and lumped inductors. Compared with the conventional half-wavelength uniform-impedance resonator, the proposed resonator achieves a compact size due to the lumped inductor employed. Moreover, transmission zeros...
A compact microstrip broadband bandpass filter with harmonic suppression is proposed. The bandwidth of the proposed wide-band filter is from 0.96 to 3.41 GHz and the 3-dB fractional bandwidth is 135%. Without increasing additional circuit size, a technique which involves embedded open stubs is used to suppress undesired high frequency harmonics. By cascading the embedded open stubs periodically in...
This study shows the influence of micro-porous layers (MPLs) structure on the performance of a proton exchange membrane fuel cell. Four MPLs were prepared with different carbon loadings. The various MPLs were prepared with different degrees of carbon loading on the surface of a gas diffusion layer (GDL), and their resistance and performance were characterized. With the same test conditions, the multi...
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