ReflectionRefractionShear layer2024Sheared flow can profoundly influence the aeroacoustic performance of near-wall structures like metasurfaces on moving vehicles. In this work, a refractive generalized Snell's law is developed by combining Snell's law with the generalized Snell's law to manipulate ...
Figure 4. Impedance reflection The presence of a transformer can alter the impedance seen by a voltage source. This is not too surprising when we consider that impedance is related to voltage and current and that a transformer with N ≠ 1 alters ...
Current reflection of highimpedanceis negative. 低阻抗之电压反射为负. 期刊摘选 展开全部 英英释义 Noun 1. a material's opposition to the flow of electric current; measured in ohms 行业词典 医学 阻抗:对交流电流所起的一种阻碍作用。在力学上,指对运动物体的阻力 ...
This reflection phase can also be used to calculate the impedance23 and this gives 3.6η, where η is the characteristic impedance of free space. This is 12 times higher than the surface impedance of the flat silver mirror. It can be seen that the far-field radiation is achieved without ...
• 电路中或传输线上的阻抗失配会产生反射,回到信号源。 • 当信号反射时,向末端负载传输的功率就会减少。 • 阻抗匹配发挥了一种双重作用,即通过抑制反射使功率传输到负载。 每当电磁信号沿着传输线传播时,都有可能从传输线和负载器件之间的接口上反射回来。负载可以是任何东西:另一段传输线、集成电路、天线....
一.基本概念介紹及名詞解釋基本概念介紹及名詞解釋 1.為何高頻訊號需重視Impedance:•主動元件之輸出阻抗•訊號線中的特性阻抗•被動元件的輸入阻抗以上三者必須相互匹配(+/-5%或+/-10%),才能減少半途中或末端的反射(Reflection)與損失,訊號才能順利完整的傳輸,以達降低雜訊堵絕訊號失真的目的2.高頻訊號特性:•...
Tunable reflection phase can be achieved by incorporating active element into the scatters, but the tuning range of the reflection phase is limited. In this paper, an active impedance metasurface with full 3606 reflection phase control is presented to remove the phase tuning deficiency in ...
3. 如何推导传输线信号反射系数(reflection coefficient)?(这一块推导内容可能比较多) 反射系数的定义:反射波电压与入射波电压之比 反射系数推导: 如下图所示,假设一信号从左侧输入,沿着特性阻抗 为Z_0的无损传输线到达位于 Z=0 处的终端,终端阻抗为Z_L, 该阻抗可能包含实部和虚部。在这种情况下,可能存在信号的...
An absorbing termination is placed in front of the loudspeaker to avoid the reflection from the source end. A movable probe microphone, which must be small enough not to distort the sound field, is used to measure the sound pressure maxima and minima of the standing wave in the tube at a...
Encyclopedia Wikipedia Related to impedance matching:Impedance mismatch n. The use of electric circuits, transmission lines, and other devices to make the impedance of a load equal to the internal impedance of the source of power, thereby making possible the most efficient transfer of power. ...