共查询到20条相似文献,搜索用时 15 毫秒
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Shavrov V. G. Shcheglov V. I. 《Journal of Communications Technology and Electronics》2019,64(5):492-502
Journal of Communications Technology and Electronics - Stimulated oscillations of magnetization and elastic displacement in a normally magnetized ferrite plate with magnetoelastic properties are... 相似文献
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腔体滤波器是现代微波通信系统中重要的组成,频率的计算是滤波器的关键,而频率的计算是比较繁琐的,基于复杂的理论计算。研究出了简洁实用的设计思路和设计公式,通过例题全面介绍了腔体滤波器各种频率的计算和仿真。给出了设计公式和设计步骤。首先根据综合设计得出单腔级数,再运用平板电容和筒状电容准确得到谐振杆长,通过ansoft模拟验证谐振频率,与实例有很好的吻合。 相似文献
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随着大功率电子对抗技术的不断发展,频率选择表面(FSS)结构的功率耐受问题成为亟待解决的技术难题,而国内外鲜有相关报道。本文主要针对此问题展开了理论和仿真分析,并通过典型样件的试验结果对分析结果进行了验证。首先通过将电磁场理论和经典传热学理论相结合,对带有FSS 结构和纯介质结构典型样件的功率耐受问题进行了理论建模和分析。然后,在多物理场仿真环境下对FSS 加载夹层结构和纯介质夹层结构的典型样件在微波照射效应下的温升效应进行了建模和功率耐受性能计算。最后,制作了符合理论模型的FSS 结构和纯介质结构典型样件,在微波暗室内对其功率耐受性能进行了实测验证。结果表明,在相同介质厚度的情况下,带有FSS 结构的典型样件在同等强度的微波激励下会产生更高的温升。 相似文献
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In this paper, an ultra‐small marker beacon antenna operated in the VHF‐band is proposed. This antenna has a modified linear IFA structure with a lumped capacitor and a capacitive plate for frequency tuning and impedance matching. The capacitive plate is directly connected to the end of a linear radiator and is separated from the antenna ground by 1 mm. The main operating frequency is mainly controlled by the size and dielectric constant of the capacitive plate. The lumped capacitor is useful for fine frequency tuning. Using the proposed structure, an ultra‐small marker beacon antenna can be realized with a length of 0.04 λ0. 相似文献
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Vlasov V. S. Ivanov A. P. Shavrov V. G. Shcheglov V. I. 《Journal of Communications Technology and Electronics》2021,66(8):980-988
Journal of Communications Technology and Electronics - The problem of excitation of nonlinear forced oscillations of magnetization and elastic displacement in a ferrite plate of a magnetostriction... 相似文献
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R. Cahill I. M. Sturland J. W. Bowen E. A. Parker A. C. de Lima 《Journal of Infrared, Millimeter and Terahertz Waves》1993,14(9):1769-1788
The purpose of this paper is to compare the filtering properties of drilled plate and printed element frequency selective surfaces in the range 80 – 800 GHz. Novel techniques for measuring and fabricating the devices are described, and close agreement is shown between numerical simulation and experimental results. 相似文献
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V. G. Shavrov V. I. Shcheglov 《Journal of Communications Technology and Electronics》2017,62(9):1004-1017
The forced oscillations of the magnetization and elastic displacement in the normally magnetized ferrite plate with magnetoelastic properties are discussed. The process whereby the initial frequency is divided in the ratio defined by the multiplicity of the resonance frequencies of magnetic and elastic subsystems is investigated. The time and amplitude characteristics of the phenomenon are revealed on the basis of the impact excitation model of an elastic system under short-term magnetic actions. Recommendations are given for the practical implementation of excitation-frequency division in the scheme of a magnetostriction transducer. 相似文献
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作者采用一种新方法设计了可在高压下工作的高频VDMOS器件,该器件具有二级场板终端结构。通过在工艺上利用多晶硅选择氧化形成漏表面厚氧化层,不仅可以有效地减小C_(gd),而且可以减小C_(gs)。该方法简化了器件制作工艺并实现了自对准扩散。 相似文献
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结合激光外差干涉术和反射式椭偏测量技术,设计了一种抗干扰能力强,快速、高精度
测量纳米厚度薄膜光学参数的方法。着重分析并计算了非线性混频误差对测量精度的影响,其中塞曼激光和波片产生的光束椭偏化是关键因素。定义了评价因子以比较非线性混频误差的相对大小,这对外差椭偏纳米薄膜测量系统的设计有指导意义。 相似文献
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Experiments using a parallel plate waveguide as the measurement medium have revealed a strong dependence of RF absorption in rats and biological-phantom prolate spheroidal bodies upon the frequency and polarization of electromagnetic fields. The results correlate well to those of free space irradiation. Strongest power deposition is observed for fields polarized along the long dimension of the bodies for frequencies such that the major length is about one-quarter wavelength of radiation. At resonance, an effective absorption area of 2.5 to 3.5 times the shadow cross section is measured. 相似文献
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