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[IEEE 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Guangzhou, China (2019.5.19-2019.5.22)] 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - A Wideband Substrate Integrated Waveguide Filtering Power Divider
摘要： A wideband substrate integrated waveguide (SIW) filtering power divider (FPD) is presented in this paper. It works in the C band. The FPD used two SIW rectangular cavities and one half-mode substrate integrated waveguide (HMSIW) triangular cavity cascade and centered at 7.5GHz with fractional bandwidth (FBW) of 10.6%.The design parameters of the presented FPD are given and the simulated results are proposed with good expectations. This FPD meets the requirements for miniaturization and integration with other microwave circuits.
关键词： wideband,filtering power divider,fractional bandwidth,substrate integrated waveguide,C band,HMSIW
更新于2025-09-19 17:13:59
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[IEEE 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Guangzhou, China (2019.5.19-2019.5.22)] 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Wideband Coupler Based on Wide-Wall Coupling Half-Mode Ridge Substrate Integrated Waveguide
摘要： A wideband coupler based on half-mode ridge substrate integrated waveguide (HMRSIW) is designed in this paper. The coupler utilizes a gradual slot on wide-wall to couple. The measured coupling bandwidth is 49.8%. The return loss and isolation are better than 20dB from 11.76GHz to 17.88GHz.
关键词： half-mode ridge substrate integrated waveguide,HMRSIW,Ku-band,wideband coupler
更新于2025-09-19 17:13:59
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A robust SiC nanoarray blue-light photodetector
摘要： Silicon carbide (SiC) is recognized as one of the most important candidates of third generation semiconductors with totally superior physical/chemical properties and exciting applications in opto/electronic devices. In the present work, we report the exploration of high-performance blue-light photodetectors on both rigid and flexible substrates by using SiC nanoarrays, which are aligned by dielectrophoresis. The rise and decay times of the photodetector assembled on a rigid (i.e., SiO2/Si) substrate are B0.39 and 0.56 s, respectively, with an external quantum e?ciency of 3394%, which suggested that the SiC nanoarray photodetector has high sensitivity, fast responsivity and excellent reproducibility to light irradiation with a wavelength of 445 nm. Meanwhile, 73% of the maximum photocurrent response can be maintained after 6 months. Furthermore, the as-constructed flexible photodetector based on the polyethylene terepthalate (PET) substrate was highly stable against repeated bending, demonstrating that the as-constructed SiC photodetector was robust with high flexibility and electrical stability.
关键词： SiC,nanoarrays,dielectrophoresis,flexible substrate,blue-light photodetector
更新于2025-09-19 17:13:59
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Thermally annealed wafer-scale h-BN films grown on sapphire substrate by molecular beam epitaxy
摘要： The effect of high temperature annealing (HTA) on crystalline quality improvement of h-BN films grown on sapphire substrates has been investigated. It is found that BN grown using conventional molecular beam epitaxy is disordered due to the growth temperature below 1000 °C. By annealing at a temperature of 1700 °C, thermodynamically stable crystalline h-BN could be obtained at wafer scale, where diffusion of atoms in the as-grown BN film is enhanced and the structural defect density decreases. The crystalline h-BN has been confirmed by x-ray diffraction, Raman scattering, and atomic force microscopy measurements. This work demonstrates that HTA is a simple and effective way to achieve wafer-scale crystalline h-BN films, which have numerous potential applications in next-generation two-dimensional devices and flexible III-nitride optoelectronic devices.
关键词： crystalline quality,molecular beam epitaxy,sapphire substrate,h-BN films,high temperature annealing
更新于2025-09-19 17:13:59
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[IEEE 2018 11th UK-Europe-China Workshop on Millimeter Waves and Terahertz Technologies (UCMMT) - HangZhou, China (2018.9.5-2018.9.7)] 2018 11th UK-Europe-China Workshop on Millimeter Waves and Terahertz Technologies (UCMMT) - A Space Harmonic Leaky-Wave Antenna Based on Half Mode Substrate Integrated Waveguide
摘要： A space harmonic leaky-wave antenna based on half mode substrate integrated waveguide (HMSIW) is proposed. This antenna operates in the first negative mode of the guiding structure which is a space harmonic wave using transverse slots. Continuous backward to forward beam scanning is achieved within 25 ± 10 GHz and the highest gain of the antenna can achieve 24.8dBi. The size of the antenna is half of the HMSIW antenna.
关键词： half mode substrate integrated waveguide (HMSIW),space harmonics,leaky-wave antenna
更新于2025-09-19 17:13:59
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An Assembled Ordered W18O49 Nanowire Film with high SERS Sensitivity and Stability for the detection of RB
摘要： In this work, a novel ordered nanowire film composed of non-stoichiometric semiconductor metal oxide, W18O49, was assembled by a three-phase-interface approach. The prepared W18O49 nanowires possess relatively uniform morphologies with average diameter of about 10 nm. When employed as the SERS substrate for the detection of rhodamine B (RB), the ordered W18O49 nanowire film calcined in Ar/H2 (W18O49-H2) exhibited stronger SERS signal than W18O49 nanowire films which resulted from the existence of more oxygen vacancies due to the reduction effect of H2. The SERS detection limit of RB on W18O49-H2 nanowire films reached 10-7 M. And more importantly, the W18O49-H2 nanowire film SERS substrate possessed outstanding reproducibility for detecting RB because of the ordered as well as stable morphology, reflecting in the low relative standard deviation (RSD) (9.7%). Therefore, as a new non-noble metal SERS substrate, the W18O49-H2 nanowire film provides an important inspiration for its wide application in the detection of pollutants.
关键词： reproducibility,ordered W18O49 nanowire film,SERS substrate,RB detection
更新于2025-09-19 17:13:59
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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
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[IEEE 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Guangzhou, China (2019.5.19-2019.5.22)] 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - A Novel Power Divider Based on Hybrid Circuit of Surface Plasmon Polaritons and Substrate Integrated Waveguide
摘要： In this paper, a novel power divider based on hybrid circuit of spoof surface plasmon polaritons (SPPs) and substrate integrated waveguide (SIW) is proposed. The hybrid circuit consists of three paths including one input branch (SIW) and two identical output branches (spoof SPPs). The pass-band of the power divider is controllable by designing the geometrical parameters of spoof SPPs and SIW, which is because that spoof SPPs and SIW can adjust the upper and lower cutoff frequencies, respectively. Simulated results demonstrated the characteristics of power dividers, such as highly efficient transmission, low loss, and bandwidth adjustable. The combining of spoof SPPs and SIW provides more potential for the development of the integrated functional devices in microwave frequency.
关键词： spoof surface plasmon polaritons (SPPs),hybrid circuit,substrate integrated waveguide (SIW),power divider,microwave frequency
更新于2025-09-19 17:13:59
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A SIMPLIFIED IMPLEMENTATION OF SUBSTRATE INTEGRATED NON-RADIATIVE DIELECTRIC WAVEGUIDE AT MILLIMETER-WAVE FREQUENCIES
摘要： The substrate integrated non-radiative dielectric (SINRD) guide presents a rather complicated process of design and implementation because of multiple interrelated design parameters involved in the de?nition of structures. In this work, the size of SINRD guide is halved by using a perfect electrical conductor (PEC) image plane. Consequently, the number of modes in the resulting image SINRD (iSINRD) guide is equally reduced since all even modes including the LSE 10 mode are suppressed. Furthermore, a simple yet accurate design method is proposed that takes into account many parameters involved in the design of an SINRD guide, especially dimensions of perforation and dispersion e?ects.Three iSINRD prototypes are fabricated to test the proposed method over the W-band frequency range. Two of the prototypes are based on Alumina substrate with di?erent perforation pro?les, and both exhibit insertion loss around 1 dB while the return loss is around 16 dB. The third is based on RO6002 substrate and exhibits an insertion loss of around 3 dB and a return loss of around 14 dB. To test the leakage loss caused by periodic gaps in the PEC wall, two iSINRD lines with one and three gaps were fabricated. The insertion and return losses of the former case are respectively 1.2 dB and 17 dB compared to 2.5 dB and 18 dB of the latter case.
关键词： return loss,insertion loss,W-band,image SINRD (iSINRD) guide,Alumina substrate,millimeter-wave frequencies,RO6002 substrate,Substrate Integrated Non-Radiative Dielectric (SINRD) guide
更新于2025-09-16 10:30:52
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[IEEE 2019 49th European Microwave Conference (EuMC) - Paris, France (2019.10.1-2019.10.3)] 2019 49th European Microwave Conference (EuMC) - Viability of using additive manufacturing for horn antennas fed with empty substrate integrated waveguide
摘要： Substrate integrated waveguides reduce the losses when compared to traditional planar transmission lines, while maintaining their low profile, and low cost manufacturing. The losses have been further reduced by partially or fully removing the dielectric, and many microwave devices have been successfully implemented with empty substrate integrated waveguides, including H-plane horn antennas. The directivity of the horn antenna can be increased using 3D pyramidal horns, and sacrificing the low profile. However, the low cost can be maintained by using additive manufacturing. In this work the viability of using additive manufacturing for two horn antennas fed with empty substrate integrated waveguide is studied.
关键词： three-dimensional printing,pyramid horn antenna,substrate integrated waveguide,Empty substrate integrated waveguide,exponential horn antenna
更新于2025-09-16 10:30:52