near-field pattern 中文意思是什麼
near-field pattern
解釋
近場方向圖-
First, it was taken that a discuss about the effects of geometry parameters of each piezocrystal on direction parameters ( main lobe width, side lobe amplitude, elimination of grating lobes ), amplitude of ultrasonic pressure, element viberation pattern, mutual radiation among elements, efficient test regions, ability to keep accurate and near - field distance and so on. based on the direction of ultrasonic field in ulpa deduced by ourselves. in addition, on the base of integrating all kinds of factors, it was put forward that the principle and method for optimized design of geometry parameters of piezocrystals in ulpa transducer, and its design programme and interface were compiled
首先在推導超聲相控線陣換能器聲場的指向性的基礎上，就各個晶片幾何參數對指向性指標（主瓣寬度、旁瓣幅度、消除柵瓣） 、聲壓幅值、陣元振動模式、陣元間互輻射、有效檢測區域、精確控制能力、近場長度等方面的影響進行了論述，並在綜合各方面影響的基礎上，提出了晶片幾何參數優化設計的原則和方法，編寫了設計程序和界面。 -
The vector - based plane - wave spectrum method ( vpws ) is improved, which can directly obtain the far field diffractive pattern depending on the output near field data in the bor fdtd meshes by use of the deduced formulas in this dissertation
改進了平面波譜傳播演算法（ vpws ） ，推導出的公式可以由borfdtd計算空間內的近場輸出數據直接計算出遠場的電磁場分佈。 -
While carrying out the scheme, at first, the basic theory of antenna, array antenna and electromagnetic absorption, the performance parameter of antenna and parabolic antenna are deeply researched. in conformity, the characteristic and calculation of aperture field and near - to - far - field transformation for radiation pattern are detailed analyzed. second, the factors such as, the amount of the antenna elements, mutual coupling between each element, ground and the buildings on earth ' s surface, which affect the performance of array antennas ’ resultant field are stressed discussed
在系統實現過程中，課題首先從天線、陣列天線，以及電磁場計算方法的基本理論著手，分析了天線與拋物面天線的各項性能參數，以及天線的口面場和近-遠區輻射場的特點和計算;進而，更加深入的討論和研究影響天線陣列合成場強的各項因素，包括系統所使用的天線單元個數對陣列合成場的影響、天線單元之間由於互耦造成的影響、傳播過程中地面和/或地面建築物的影響等。 -
Near field pattern
近場圖樣 -
Analysis of near - field distribution and cross - polarization radiation pattern cavity - backed microstrip patch antenna on a uniaxial substrate
單軸各向異性背腔式微帶貼片天線的表面縫隙場分佈及交叉極化方向圖分析 -
With the modeling versatility in disk geometry and material, the 3 - d hybrid method can simulate accurately the readout of an optical disk with direct investigations on the 3 - d full - wave near - field distribution, the far - field pattern and the readout signal
基於其在模型設定方面很好的通用性，此方法能夠準確的模擬光盤光學信號讀取過程，並能夠直接給出三維近場全矢量衍射分佈、遠場矢量衍射圖樣及輸出信號。 -
Output near - field radiation pattern measurement of optical waveguide fiber
光學波導纖維的輸出近場輻射圖形測量 -
Comparision spectrum and spatial distribution of pulse current on a transmission line and it ' s near and far field radiation pattern
傳輸線線上脈波電流之頻譜與分佈及其各頻率成份之輻射遠近場型之差異。 -
Verification of differences of characteristics of electromagnetic field image and radiation pattern in the near and far field are demonstrated
驗證電磁場影像及場型特性在近場與遠場中之差異。 -
The radiation pattern in the near and far field of each frequency component of the spectrum of current pulse on a transmission line
傳輸線上脈波電流頻譜中各頻率成份在遠近場區中場型之比較。 -
In the near field, the image and radiation pattern of electric and magnetic field are different and varies with distance, the image of electric field is similar to the charge distribution of the source while the image of magnetic field is similar to the source current distribution
在越近之近場中，電場與磁場影像及場型各不相同，距離越近差異越大，電場之影像越近似於電流源之電荷分佈，磁場之影像則越近似於電流源之電流分佈。
分享友人