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This paper presents a novel low-pass filter （LPF） with sharp rejection, wide stopband and compact size, which are realized by the defected ground structure （DGS） and the defected microstrip structure （DMS）. The equivalent circuit model is proposed and the circuit parameters are extracted by the circuit simulation software. The parameters measured are 3 dB cutoff frequency fc of 5.2 GHz, the insertion loss less than 0.5 dB from DC to 4.0 GHz and S21 less than -20 dB within the wide stopband from 6 GHz to 16 GHz. The results of the circuit optimization agree well with those of the full wave simulation and the measured ones, which validate the effectiveness of the equivalent circuit model. The size of the proposed LPF is decreased compared with normal LPF. This LPF can be applied in rectennas to eliminate high order harmonics. 相似文献
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《送孟浩然之广陵》是唐朝诗人李白写的一首脍炙人口的好诗。这首诗意境高雅,情趣盎然,诗句通俗易懂,语言优美流畅,读来朗朗上口。浅显的诗句中却蕴涵着诗人对老朋友的深厚情意,透过诗句体会诗人的真实感情,就成了这首诗教学中的难点。为了突破这一难点,帮助学生细腻而透彻地理解诗句,体会诗人的情意,陶冶学生的情操,我采用电教媒体,进行了以下教学。 一、用音乐烘托气氛,创设情境 在背景介绍中,通过悠扬缠绵的乐曲以及抑扬顿挫的范读录音很自然地把学生带入诗的意境中去;在讲解后两句时,李白立于江边遥望帆影在滚滚的长江上… 相似文献
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The micro-genetic algorithm(MGA)optimization combined with the finite-difference time-domain(FDTD)method is applied to design a band-notched ultra wide-band(UWB)antenna. A U-type slot on a stepped U-type UWB monopole is used to obtain the band-notched characteristic for 5 GHz wireless local area network(WLAN)band. The measured results show that voltage standing wave ration(VSWR)less than 2 covers 3.1-10.6 GHz operating band and VSWR more than 2 is within 5.150-5.825 GHz notched one with the highest value of 5.6. Agreement among the calculated, HFSS simulated and measured results validates the effectiveness of this MGA-FDTD method, which is efficient for UWB antennas design. 相似文献
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针对传统文本—图像对抗模型中,由于反卷积网络参数过多容易产生过拟合现象,导致生成图像质量较差,而线性分解方法无法解决文本—图像对抗模型中输入单一的问题,提出一种在线性分解基础上加入流形插值的算法,并对传统 DCGAN 模型进行改进,以提高图像的鲁棒性。仿真实验结果表明,生成花卉图像的 FID分数降低了 4.73%,生成鸟类的 FID 分数降低了 4.11%,在 Oxford-102 和 CUB 两个数据集上生成图像的人类评估分数分别降低了 75.64%和 58.95%,初始分数分别提高 14.88%和 14.39%,说明新模型生成的图片更符合人类视角,图片特征更为丰富。 相似文献
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2004年我参加了普通高中美术新课程省级培训班,对新课程改革思路有了新的理解:重视学生感受和体验的自主性;重视学生的感觉并培养之;培养学生的创造力,教会学生如何学习、解决问题、创造性表现、通过探索掌握知识技能;注重培养实践能力. 相似文献
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