無源天線 的英文怎麼說

中文拼音 [wúyuántiānxiàn]
無源天線 英文
parasitic aerial
  • 無 : 無Ⅰ動詞（沒有） not have; there is not; be without Ⅱ名詞1 （沒有） nothing; nil 2 （姓氏） a surn...
  • 源 : 名詞1. （水流起頭的地方） source （of a river）; fountainhead 2. （來源） source; cause 3. （姓氏） a surname
  • 線 : 名詞1 （用絲、棉、金屬等製成的細長的東西） thread; string; wire 2 [數學] （一個點任意移動所構成的...
  • 無源 : [無線電] passive無源電路 passive circuit; passive electric circuit; 無源天線 passive antenna; ref...
  1. Radio disturbance characteristics for the protection of receivers used on board vehicles, boats, and on devices - limits and methods of measurement - specifications for active antennas

    道上車輛船舶和設備上用接收機保護的無線電干擾特性.限值和測量方法.有源天線規范
  2. The paper studies three key problem of base station array antenna for mobile communication, controlled radiation pattern, beam width and passive intermodulation

    本文研究移動通信基站天線中的三個關鍵問題，波束賦形、波瓣寬度、無源交調。
  3. Then we introduce the character of the atmosphere channel, which we emphasized on the atmosphere scatter, absorption and scintillation ' s effect on the laser beam. in chapter, we explain why we used cassegrain telescope to collect the optical signal at first, then the lightsource, detector, front amplifier used in optical communication has been compared to that of fiber communication, the noise including shot noise, thermal noise and background light noise has been explained here for analysis the snr and ber in the next section

    在第三章介紹無線光接入系統的光收發單元，採用多孔徑卡塞格倫式的收發天線對消除減小大氣湍流影響有較大作用，針對大氣通道的特點無線光系統收發單元在光源、光探測器、前置放大電路上存在許多有別于光纖通信的技術，同時還闡述了光接收機包括背景噪聲的噪聲機制和接收靈敏度、誤碼率等指標，最後給出了一個整個傳送鏈路的功率預算。
  4. Zhuangchai lake locates at zhuangjia village, yucheng town. the south of it is new yanhu road and the north of it is jiayuxia river. its surface area is about 195mu, and its surrounding area is about 200mu. there are 3 small islands in the middle of the lake, 3mu, 4mu and 60mu separately. zhuangchai lake black - back orucian is very famous. there are many kind of river fishes in the lake. the lake is a natural breed base. this program relies on zhuangqiao lake ' s special resource advantages and wants to develop sper cial leisure farm

    莊柴湖位於海鹽縣于城鎮莊家村，南連新鹽湖公路，北接加於硤航線，水面面積195畝，周邊區域200畝，河內有三個面積分別為3畝、 4畝、 60畝的小島，莊柴湖烏背鯽魚享譽縣內外，湖內養殖了白鰱、花鰱、草魚、青魚等傳統四大家魚，資源豐富，使無公害生態水產的天然養殖基地，本項目依託莊柴湖獨特資源優勢，開發特色休閑農莊。
  5. It has many good qualities such as energy saving, simply structured, cheaply and easily to operate and maintain, there is no revolving parts in the cooling part and can be run with liquid. for the above - mentioned reasons, the thermal separator has a lot of applications in chemical processes and engineering transformation, especially in the fields of liquid products recover from associated gas in oil field or light hydrocarbon gas in torch line, dehydrate natural gas, provides cold resource for scientific research

    熱分離機是一種高效節能的新型氣體膨脹製冷裝置，具有結構簡單、造價低廉、操作維護方便、壽命長、製冷部分無轉動件及可以帶液運行等特點，有廣闊的應用前景，並已在油田伴生氣或火炬管線中輕烴的回收、天然氣脫水、為科學研究提供冷源等場合得到應用。
  6. The system uses the permanent magnet synchronous machine as the driver motor based on the idea of polygonal flux linkage locus and the permanent magnet brush - less motor is as the momentum balance motor by means of speed and current loop in order to track driver motor precisely and rapidly. the harmonious control of driver motor and balance motor is realized by making full use of the dsp hardware resource and complicated programmable logic device. the software design is composed of c and assembly language to realize motor control arithmetic of polygonal flux linkage locus

    衛星天線伺服控制系統以正弦波永磁同步電機作為驅動電機，採用多邊形磁鏈軌跡法（電壓空間矢量法）的控制策略；動量平衡電機採用永磁無刷直流電機，通過電流環、速度環達到快速、精確跟蹤驅動電機的目的，確保了衛星姿態恆定；設計方案中充分利用了dsp硬體資源和復雜邏輯陣列實現了驅動電機和平衡電機的協調控制，並通過c語言和匯編語言的混合編程實現了電機的多邊形磁鏈軌跡控制演算法。
  7. 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，建立了笛卡兒坐標下無源空間中均勻無耗媒質的fdtd基本方程和圓柱坐標下無源空間中均勻無耗媒質的fdtd基本方程，詳細討論了fdtd法計算中時間步長和空間步長的選取原則以及激勵源的類型和設置；推導了mur一階和二階邊界條件在圓柱坐標下的差分格式；給出了在用fdtd法計算天線的遠場輻射特性時必需採用的頻域和時域近場遠場變換技術；最後用fdtd法計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區輻射場，並分析了天線的一些參數的變化對天線輸入阻抗的影響，得出了一些有用的結論。
  8. Whether from commiseration for a woman of so miserable a destiny ; or from the morbid curiosity that gives a fictitious value even to common or worthless things ; or by whatever other intangible circumstance was then, as now, sufficient to bestow, on some persons, what others might seek in vain ; or because hester really filled a gap which must otherwise have remained vacant ; it is certain that she had ready and fairly requited employment for as many hours as she saw fit to occupy with her needle

    或許是出於對這位如此命苦的女人的憐憫；或許是出於對平淡無奇的事情也要故弄玄虛的少見多怪；或許是出於某種難以解釋的原因? ?這在當時和今天都是有的? ?某些人苦求不得的、別人卻可予取予奪、或許是因為海絲特確實填補了原先的一項空白；不管是什麼原因吧，反正求她做針線的活路源源不斷，只要她樂意于多少鐘點，總有很不錯的收入。
  9. This kind of reflectors possessed the advantages of the traditional reflectors and the phased arrays. the reflectarray is made up of lots of resonant elements. when the feed radiate the reflectarray, the reflected wave could be focused at some desired direction owing to the adjustment of each element

    這種陣列反射天線具有反射天線和陣列天線共同的優勢，它的基本結構就是由大量的無源諧振單元組成的單屏或多屏周期性陣列，然後由一個饋源照射這個天線，通過調節介質板上每個單元對于入射波的散射相位，使得反射波在特定的方向實現同相位，發射出方向性極強的筆形波束。
  10. Fibre optic interconnecting devices and passive components - basic test and measurement procedures - part 3 - 2 : examinations and measurements - polarization dependence of attenuation in a single - mode fibre optic device

    光纖互聯裝置和無源部件.基本試驗和測量步驟.第3 - 2部分:檢驗和測量.單模纖維光學裝置中天線偏振依賴性
  11. Methods of measurement for equipment used in terrestrial radio - relay systems - part 2 : measurements for sub - systems - section two : measurements in the antennas and passive repeaters

    地面無線電接力系統所用設備的測量方法第2部分:分系統的測量第2節:天線和無源轉向器的測量
  12. Passive helical antenna

    無源螺旋天線
  13. Pulsar radio emission is markedly different from other astrophysical radio sources, characterised by extremely high brightness temperature and high degree of linear or circular polarization. the high brightness temperature of the pulsar radio emission implies that the underlying emission mechanism must be coherent. so far there is no widely accepted model for the radio emission. this paper discusses recent developments in studies of the production and propagation of pulsar radio emission

    脈沖星的射電輻射與其他天體物理輻射源有很大的不同，因為它們有著極高的亮溫度和高度的線或圓偏振.極高的亮溫度意味著起作用的發射機制一定是相干的.至今尚無對這種輻射普遍接受的模型.本文討論了關于脈沖星的射電輻射產生和傳播研究中的新進展
  14. Four network platforms - qq, qq. com, qq game and paipai. com created and their vast communities respectively formed, we have primarily set up a new business layout and industry model - online society. tencents diversified products satisfy users multi - requirements in their daily life, such as qq. com, qq im and foxmail acquired in early of 2005 for transmitting information and obtaining knowledge ; personalized blog, q - zone together with our bbs, chatting room and group discussion function making group communication and sharing resources more easily ; characterized showing and entertainment being satisfied by qq show, qq pet, qq game and qq music radio tv on live, the special wireless value - added service, color ring and message just for those mobile users ; an c2c website, paipai. com being designed and developed for our tencent s users, now it is already combined with other products seamlessly

    在滿足用戶信息傳遞與知識獲取的需求方面，我們有qq . com門戶qq即時通訊工具以及年初收購的foxmail電子郵件滿足用戶群體交流和資源共享的方面，騰訊推出的個人博客qzone將與我們訪問量極大的論壇聊天室qq群相互協同在滿足用戶個性展示和娛樂服務方面，騰訊擁有非常成功的虛擬形象產品qqshow qqpet寵物和qqgame游戲qqmusic radio livetv音樂電臺電視直播產品，另外對手機用戶提供彩鈴彩信等無線增值業務在滿足用戶的交易需求方面，專門為騰訊用戶所設計開發的c2c電子商務平臺拍拍網已經上線，並和整個社區平臺無縫整合。
  15. The only exceptions are the outdoor setting, where the hemi light fakes the light cast by the sky, and the area light, where multiple spots fake a light source of finite extension

    唯一的例外時室外設置，此時使用半光模擬來自天空的光線和區域燈光（使用多盞聚光燈模擬來自無限遠處的光源） 。
  16. Although many ultraluminous x - ray sources in nearby galaxies were discovered by the einstein x - ray observatory and rosat, the poor sensitivity and spatial resolution provide little information about their nature. in particular, due to source confusion, it is very difficult for astronomers to search for signatures at other wavelengths in order to study the physical nature of ultraluminous x - ray sources

    雖然愛因斯坦射線天文臺和倫琴射線衛星至今已發現了不少這類超強射線源，但由於靈敏度和空間解析度不足，所得的資料非常有限，再加上無法精確判定-射線的源頭位置，因此天文學家往往難以在其他波段來對它們進行詳細研究。
  17. Fortunately, a novel creative technology, namely multiple - input multiple - output ( mimo ), has provided an innovative solution to this problem. mimo technology utilizes multiple antennas at both transmit and receive ends of the radio link to multiply the capacity and reliability by fully exploiting the space resource within the same frequency band at no additional power expenditure

    可幸的是，多入多出（ mimo ）無線通信技術為解決該問題提供了全新的途徑，它在無線鏈路收發兩端均採用多天線，充分開發空間資源，在無需增加頻譜資源和發射功率的情況下，成倍地提升了通信系統的容量與可靠性。
  18. And the general procedures of these methods are summarized. finally, some practical problems are analyzed using fdtd, which include passive linear resistor element and nonlinear diode element in the microwave circuits and an integrated antenna embedded with an active gunn diode element and a dielectric cavity resonator

    最後，本文通過編程模擬了微波電路中的無源線性器件電阻和非線性器件二極體，含有有源器件gunn二極體的有源集成微帶天線以及介質腔諧振器等具體實例，來驗證各種方法的可行性和有效性，計算結果與實驗結果吻合。
  19. With reference to calculation methods of solar radiation within domestic and abroad literature and with the help of our country ' s dem ( with its resolution is 1 km x 1 km ), we build a new model for potential solar radiation calculation combining with pci geomatica ' s platform. in the calculation, hypothesis is that insofar one clear day in more than one year as the biggest value of solar radiation of one day in many years is defined as potential value of daily global solar radiation, we also consider the infection of the slope, aspect and its geometry relations affect on solar radiation. we calculate potential solar radiation which maybe useful for research the distribution of solar energy and build large - scale grid database of our country ' s solar radiation

    本研究試圖在借鑒國內外已有的太陽輻射計算方法的基礎上，利用全國的1 ： 100萬數字高程模型數據（ grid大小1km 1km ）為數據源，以pcigeomatica為計算平臺，以全國多年的太陽輻射日觀測數據進行模式驗證，在晴天無雲的理想條件下，根據太陽光線與實際地形間的幾何關系，研究坡度、坡向等地形因子對太陽輻射的影響，探討太陽輻射在復雜地表上的分配規律，力求尋找潛在太陽總輻射合理的計算方法，為研究太陽輻射時空分佈特徵和建立全國尺度的太陽輻射柵格氣象數據庫奠定基礎，為大尺度上的生態學過程研究提供基礎信息。
  20. The research in software radio is not more than ten years, but has made a great many fruits, but it is too little to set up an integrated theory system, and software radio includes many areas such as modern communication system ( which includes modem source / channel encoding and decoding, equalization, encrypt and decrypt and so on ), wideband antenna theory, digital signal process, microelectronics, computer and so on. this thesis mainly does research for modem in modem communication

    軟體無線電經過不到10年的研究，盡管取得了很多成果，但是對于建立一套完整的理論體系來說，還遠遠不夠，況且軟體無線電涉及的領域多、面廣、發展快，如現代通信理論（含調制解調、信源通道編解碼、均衡、加密解密等） 、寬帶天線理論、數字信號處理、微電子、計算機等。
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