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A new technique for designing a varactor-tunable frequency selective surface (FSS) with an embedded bias network is proposed and experimentally verified. The proposed FSS is based on a square-ring slot FSS. The frequency tuning is achieved by inserting varactor diodes between the square mesh and each unattached square patch. The square mesh is divided into two parts for biasing the varactor diodes. Full-wave numerical simulations show that a wide tuning range can be achieved by changing the capacitances of these loaded varactors. Two homo-type samples using fixed lumped capacitors are fabricated and measured using a standard waveguide measurement setup. Excellent agreement between the measured and simulated results is demonstrated. 相似文献
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A new technique of designing a dual-band frequency selective surface with large band separation is presented.This technique is based on a delicately designed topology of L-and Ku-band microwave filters.The two band-pass responses are generated by a capacitively-loaded square-loop frequency selective surface and an aperture-coupled frequency selective surface,respectively.A Faraday cage is located between the two frequency selective surface structures to eliminate undesired couplings.Based on this technique,a dual-band frequency selective surface with large band separation is designed,which possesses large band separation,high selectivity,and stable performance under various incident angles and different polarizations. 相似文献
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通过对宁波市村镇建设现状的了解和分析,讨论了急需解决的人地矛盾、环境保护、规划管理和规划设计几个方面的重要问题,并在对目前村镇规划中采用的措施进行分析的基础上,提出了一些解决问题的方案和规划对策. 相似文献
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试论高等学校图书馆建筑的扩建 总被引:1,自引:0,他引:1
作为高校三大支柱之一的大学图书馆,其发展、建设水平非常引人注目。而且在时空的变换下,图书馆建筑还具有变异和扩展的特性。本文试从图书馆建筑扩建的一般特性出发,从以下几个方面作出论证和设想:(1)馆舍的可扩展性;(2)馆舍扩建的模式:(3)借扩建契机,塑造良好的校园文化环境。 相似文献
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针对圆环刀具切触加工自由曲面,提出了一种新的基于动力学过程的多点切触刀位算法,该算法主要来自于柔顺自适应刀具吻合曲面的动力学和运动学过程。从分析圆环曲面的几何性质入手,结合动力学观点,分析自适应圆环刀具运动规律。采用 MATLAB 编写算法程序对自由开阔模具曲面多点切触刀位数据进行计算,并对刀位误差及加工带宽作了简要分析,最后利用ADAMS进行仿真验证,结果与计算方法吻合。 相似文献
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依据高温水解前处理技术理论,开发了一种固体样品中阴离子检测快速前处理装置,集提取、吸收、净化等多功能于一体,双样品同时处理,且能够配套国内外各类型离子色谱仪。利用自制前处理装置与离子色谱仪联用对再生锌原料-氧化锌混合物中的氟、氯含量进行测定,氟、氯的加标回收率分别在95.70%~102.5%、96.72%~100.3%,检出限分别为0.020、0.033μg/mL,相对标准偏差(RSD,n=11)5.0%,方法准确、可靠。 相似文献