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oe1(光电查) - 科学论文

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?? 中文（中国） ▾

  • A novel wideband bandpass filter based on CSRRa??loaded substrate integrated folded waveguide

    摘要： A novel wideband bandpass filter based on folded substrate integrated waveguide (FSIW) is presented in the article. Five square complementary split-ring resonators (CSRRs) are etched in the middle layer of the FSIW. By adjusting the physical size of the CSRR structure, the resonant frequency of the CSRRs can be tuned at the same time and the stopband performance can be changed. As transverse electromagnetic (TEM) mode can be transmitted in the stripline, FSIW excited by stripline shows wider passband than that excited by microstrip line directly. To achieve perfect impedance matching, two microstrip lines to stripline transitions are added in two ports of the filter. The proposed bandpass filter exhibits compact size, high selectivity, good stopband rejection, lower radiation loss, and wideband performances. The measured results show that the fractional bandwidth of the filter is about 35.5%. The measured return loss is better than 15 dB from 4.84 GHz to 6.90 GHz, and the insertion loss is less than 1.2 dB. The comparison between the simulated results and the measured ones validate the possibility of the technology that combines the FSIW and CSRR.

    关键词： radiation loss,compact size,folded substrate integrated waveguide,bandpass filter,complementary split-ring resonators (CSRRs)

    更新于2025-09-19 17:13:59

  • Design of miniaturized high selectivity folded substrate integrated waveguide band pass filter with Koch fractal

    摘要： This paper proposes the design of a novel double folded substrate integrated waveguide (FSIW) band pass filter (BPF) based on Koch space-filling curve (SFC). The folded SIW filter is incorporated with first and second iteration levels of Koch curve on central conducting layer. A prototype of second iteration Koch fractal FSIW BPF has been fabricated using substrate having dielectric constant 2.55 and thickness 0.508 mm for each layer and then tested. The fabricated second order filter has merits of compact size (0.204 λ0 2), high roll off rate (82.2 dB/GHz) and low insertion loss (<0.85 dB) in the X band.

    关键词： Folded Substrate Integrated Waveguide (FSIW) Koch fractal,selectivity,Bandpass filter,miniaturization

    更新于2025-09-16 10:30:52