FCC E9G - 天线与传输线系统

#E9G01🔗

Which of the following can be calculated using a Smith chart?

以下哪项可以使用史密斯圆图计算？

Impedance along transmission lines

沿传输线的阻抗

✓ 正确答案

Radiation resistance

耐辐射

Antenna radiation pattern

天线辐射方向图

Radio propagation

无线电传播

#E9G02🔗

What type of coordinate system is used in a Smith chart?

史密斯圆图使用什么类型的坐标系？

Voltage circles and current arcs

电压圆和电流弧

Resistance circles and reactance arcs

电阻圆和电抗弧

✓ 正确答案

Voltage chords and current chords

电压和弦和电流和弦

Resistance lines and reactance chords

电阻线和电抗弦

#E9G03🔗

Which of the following is often determined using a Smith chart?

以下哪项通常是使用史密斯圆图确定的？

Beam headings and radiation patterns

波束方向和辐射方向图

Satellite azimuth and elevation bearings

卫星方位角和仰角方位

Impedance and SWR values in transmission lines

传输线中的阻抗和 SWR 值

✓ 正确答案

Point-to-point propagation reliability as a function of frequency

点对点传播可靠性与频率的函数关系

#E9G04🔗

What are the two families of circles and arcs that make up a Smith chart?

构成史密斯圆图的圆和弧这两个系列是什么？

Inductance and capacitance

电感和电容

Reactance and voltage

电抗和电压

Resistance and reactance

电阻和电抗

✓ 正确答案

Voltage and impedance

电压和阻抗

#E9G05🔗

Which of the following is a common use for a Smith chart?

以下哪项是史密斯圆图的常见用途？

Determine the length and position of an impedance matching stub

确定阻抗匹配短截线的长度和位置

✓ 正确答案

Determine the impedance of a transmission line, given the physical dimensions

在给定物理尺寸的情况下确定传输线的阻抗

Determine the gain of an antenna given the physical and electrical parameters

确定给定物理和电气参数的天线增益

Determine the loss/100 feet of a transmission line, given the velocity factor and conductor materials

给定速度系数和导体材料，确定传输线/100 英尺的损耗

#E9G06🔗

On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance arcs terminate?

在图 E9-3 所示的史密斯圆图上，电抗弧终止的大外圆的名称是什么？

Prime axis

素轴

Reactance axis

电抗轴

✓ 正确答案

Impedance axis

阻抗轴

Polar axis

极轴

#E9G07🔗

On the Smith chart shown in Figure E9-3, what is the only straight line shown?

在图 E9-3 所示的史密斯圆图上，唯一显示的直线是什么？

The reactance axis

电抗轴

The current axis

当前轴

The voltage axis

电压轴

The resistance axis

阻力轴

✓ 正确答案

#E9G08🔗

How is a Smith chart normalized?

史密斯圆图如何标准化？

Reassign the reactance axis with resistance values

用电阻值重新分配电抗轴

Reassign the resistance axis with reactance values

用电抗值重新分配电阻轴

Reassign the prime center’s impedance value

重新分配主要中心的阻抗值

✓ 正确答案

Reassign the prime center to the reactance axis

将素数中心重新分配给电抗轴

#E9G09🔗

What third family of circles is often added to a Smith chart during the process of designing impedance matching networks?

在设计阻抗匹配网络的过程中，史密斯圆图中经常添加哪第三个圆族？

Constant - SWR circles

常数 - SWR 圈

✓ 正确答案

Transmission line length circles

传输线长度圈

Coaxial-length circles

同轴长度圆

Radiation-pattern circles

辐射图案圆圈

#E9G10🔗

What do the arcs on a Smith chart represent?

史密斯圆图上的弧代表什么？

Frequency

频率

SWR

驻波比

Points with constant resistance

电阻恒定的点

Points with constant reactance

电抗恒定的点

✓ 正确答案

#E9G11🔗

In what units are the wavelength scales on a Smith chart calibrated?

史密斯圆图上的波长刻度以什么单位进行校准？

In fractions of transmission line electrical frequency

以传输线电频率的分数表示

In fractions of transmission line electrical wavelength

以传输线电波长的分数表示

✓ 正确答案

In fractions of antenna electrical wavelength

以天线电波长的分数表示

In fractions of antenna electrical frequency

以天线电频率的分数表示

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FCC E9G - 天线与传输线系统

小节 E9G：天线与传输线系统