例句與用法

1. Finally applies this structure in antenna , and gives a example of rectangular patch antenna . from the example , it can be observed that the high impedance surface can restrain the backwards radiation . 2
   最后將這種高阻抗表面運(yùn)用到天線上,給出了一個(gè)矩形貼片天線的仿真例子,從中觀察到了高阻抗表面能抑制后向輻射,增強(qiáng)輻射效率的作用。
2. The algorithm of construction of a fractal interpolation surface patch based on rectangular patch is presented in the modeling , the construction algorithms of osteons and volkmann canals are designed , and the distribution of volkmann canals , the size and structure of osteons can be regulated and controlled according to different area , so it can satisfy the needs of the internal microstructure model
   在建模中，提出了矩形平面片生成分形插值曲面片的算法，完成了骨單位、浮克曼管的構(gòu)造算法，并實(shí)現(xiàn)了根據(jù)不同區(qū)域?qū)Ω】寺艿姆植?、骨單位的大小、結(jié)構(gòu)等特征進(jìn)行靈活調(diào)控，以滿足內(nèi)部微細(xì)結(jié)構(gòu)模型的要求。
3. In chapter 4 , method of moment ( mom ) solution of transient electromagnetic scattering by perfect conducting surfaces is discussed by dealing with time - domain integral equations ( tdie ' s ) . rectangular patches model and triangular patches model are compared and their applications are exploited . in the mean time reference [ 42 ] and [ 61 ] are recruited
   其中第四章通過求解時(shí)域積分方程給出了良導(dǎo)體表面瞬態(tài)電磁散射的矩量法解，比較了矩形貼片模型和三角貼片模型并拓展了它們的應(yīng)用，補(bǔ)充了文獻(xiàn)[ 42 ]和[ 61 ]的內(nèi)容；第五章工作重心是計(jì)算機(jī)顯示器屏蔽箱體的設(shè)計(jì)，對通風(fēng)問題給予了充分考慮。
4. Firstly , model of bone internal microstructure is constructed by basic structure unit ( rectangular patch ) ; secondly , fractal interpolation surface patch is constructed by processing rectangular patch ; thirdly , stl model of bone internal microstructure is formed by transforming model data according to stl formation
   采用面向?qū)ο蟮姆椒?，提出并?shí)現(xiàn)了人工活性骨內(nèi)部微細(xì)結(jié)構(gòu)的建模方案：首先以矩形平面片為基本構(gòu)造單元片，構(gòu)造出內(nèi)部微細(xì)結(jié)構(gòu)的模型。其次，每個(gè)矩形平面片生成分形插值曲面片。
5. The conformal microstrip antenna with some unique character has been applied in many fields , especialy on speedy objects . in this paper , an efficient fdtd algorithm is introduced to analyse the microstrip antenna . firstly , the fdtd formula in descartes coordinate system and in cylindrical coordinate system are obtained from the time _ dependent maxwell equations using the yee algorithm in a calculating region where the dielectric parameters are independent of time and space . the choice of the space discretization units and the time discretization interval are discussed which are decided by the accuracy and stability respectively . the shape and setup of the excitation source are discussed too . the excitation source is chosen to be gaussian pulse in shape . secondly , the mur ' s first - order and second - order boundary condition are deduced in cylindrical coordinate system . the methods of transforming radiation fields from near zone to far zone in the frequency domain and in the time domain are presented when fdtd is applied to analyse the characteristics of far zone . finally , three kinds of microstrip antennas are analysed . they are a slot antenna that lies on a plane ground of a microstrip , a slot antenna that lies on a cylindrical ground of a microstrip and a microstrip line _ fed aperture coupled stacked rectangular patch antenna in cylindrical coordinate system
   本文從麥克斯韋旋度方程出發(fā)，建立了笛卡兒坐標(biāo)下無源空間中均勻無耗媒質(zhì)的fdtd基本方程和圓柱坐標(biāo)下無源空間中均勻無耗媒質(zhì)的fdtd基本方程，詳細(xì)討論了fdtd法計(jì)算中時(shí)間步長和空間步長的選取原則以及激勵(lì)源的類型和設(shè)置；推導(dǎo)了mur一階和二階邊界條件在圓柱坐標(biāo)下的差分格式；給出了在用fdtd法計(jì)算天線的遠(yuǎn)場輻射特性時(shí)必需采用的頻域和時(shí)域近場遠(yuǎn)場變換技術(shù)；最后用fdtd法計(jì)算了平面微帶縫隙天線、柱面共形微帶縫隙天線和柱面共形微帶層疊天線的輸入阻抗和遠(yuǎn)區(qū)輻射場，并分析了天線的一些參數(shù)的變化對天線輸入阻抗的影響，得出了一些有用的結(jié)論。