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小电流系统多频率谐振分析
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作者 张常全 赵素勤 曹建萍 《邯郸职业技术学院学报》 2001年第2期49-52,92,共5页
通过对小电流系统易发生的多频率谐振原理、谐振条件、影响谐振的因素和消除谐振的诸多措施 ,提出了限制谐振过电压的方法 ,避免产生谐振过电压 ,提高供电系统安全性和可靠性。
关键词 小电流系统 多频率谐振 铁磁谐振 谐振条件 阻尼电阻 双向可控硅 瞬间断续短接 电网谐振 谐振过电压 消谐方法
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Compact Multiband Patch Antenna Based on CRLH-TL Structures
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作者 Zhong-Qing Wang Bao Li Li-Dan Peng 《Computer Technology and Application》 2012年第5期342-346,共5页
A compact multiband patch antenna is designed by using HFSS in this work, which is filled with composite right/left-handed transmission line (CRLH-TL) structures. The simulated results reveal that the operating freq... A compact multiband patch antenna is designed by using HFSS in this work, which is filled with composite right/left-handed transmission line (CRLH-TL) structures. The simulated results reveal that the operating frequency becomes lower with left-handed (LH) characteristics of the CRLH-TL structures enhanced, which enable antenna physical size reduction to a large extent. The proposed antenna is fabricated on the substrate Rogers R03201 (relative permittivity of 10.2), which has a compact size of 12 mm×12 mm × 4 mm. Moreover, this antenna exhibits monopole-like radiation pattern at one resonance frequency and patch-like radiation at the other four resonant frequencies. Therefore, the designed antenna is useful for communication systems. 展开更多
关键词 Multiband antennas monopole-like radiation composite right/left handed transmission line (CRLH-TL).
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