Posted on Categories:Microwave Engineering, 微波工程, 电气工程代写

## avatest™帮您通过考试

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## 电气工程代写|微波工程代写Microwave Engineering代考|Microwaves – Rat-race Junction

This microwave device is used when there is a need to combine two signals with no phase difference and to avoid the signals with a path difference.

A normal three-port Tee junction is taken and a fourth port is added to it, to make it a ratrace junction. All of these ports are connected in angular ring forms at equal intervals using series or parallel junctions.

The mean circumference of total race is $1.5 \lambda$ and each of the four ports are separated by a distance of $\lambda / 4$. The following figure shows the image of a Rat-race junction.

Let us consider a few cases to understand the operation of a Rat-race junction.

## 电气工程代写|微波工程代写Microwave Engineering代考|Microwaves – Cavity Klystron

For the generation and amplification of Microwaves, there is a need of some special tubes called as Microwave tubes. Of them all, Klystron is an important one.

The essential elements of Klystron are electron beams and cavity resonators. Electron beams are produced from a source and the cavity klystrons are employed to amplify the signals. A collector is present at the end to collect the electrons. The whole set up is as shown in the following figure.

The electrons emitted by the cathode are accelerated towards the first resonator. The collector at the end is at the same potential as the resonator. Hence, usually the electrons have a constant speed in the gap between the cavity resonators.

Initially, the first cavity resonator is supplied with a weak high frequency signal, which has to be amplified. The signal will initiate an electromagnetic field inside the cavity. This signal is passed through a coaxial cable as shown in the following figure.

Due to this field, the electrons that pass through the cavity resonator are modulated. On arriving at the second resonator, the electrons are induced with another EMF at the same frequency. This field is strong enough to extract a large signal from the second cavity.

## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。

Posted on Categories:Microwave Engineering, 微波工程, 电气工程代写

## avatest™帮您通过考试

avatest™的各个学科专家已帮了学生顺利通过达上千场考试。我们保证您快速准时完成各时长和类型的考试，包括in class、take home、online、proctor。写手整理各样的资源来或按照您学校的资料教您，创造模拟试题，提供所有的问题例子，以保证您在真实考试中取得的通过率是85%以上。如果您有即将到来的每周、季考、期中或期末考试，我们都能帮助您！

•最快12小时交付

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## 电气工程代写|微波工程代写Microwave Engineering代考|Microwaves – Waveguides

Generally, if the frequency of a signal or a particular band of signals is high, the bandwidth utilization is high as the signal provides more space for other signals to get accumulated. However, high frequency signals can’t travel longer distances without getting attenuated. We have studied that transmission lines help the signals to travel longer distances.

Microwaves propagate through microwave circuits, components and devices, which act as a part of Microwave transmission lines, broadly called as Waveguides.

A hollow metallic tube of uniform cross-section for transmitting electromagnetic waves by successive reflections from the inner walls of the tube is called as a Waveguide.
The following figure shows an example of a waveguide.

A waveguide is generally preferred in microwave communications. Waveguide is a special form of transmission line, which is a hollow metal tube. Unlike a transmission line, a waveguide has no center conductor.
The main characteristics of a Waveguide are –

The tube wall provides distributed inductance.

The empty space between the tube walls provide distributed capacitance.

These are bulky and expensive.

## 电气工程代写|微波工程代写Microwave Engineering代考|Advantages of Waveguides

Following are few advantages of Waveguides.

• Waveguides are easy to manufacture.
• They can handle very large power (in kilo watts).
• Power loss is very negligible in waveguides.
• They offer very low loss (low value of alpha-attenuation).
• When microwave energy travels through waveguide, it experiences lower losses than a coaxial cable.
Types of Waveguides

There are five types of waveguides.
• Rectangular waveguide
• Circular waveguide
• Elliptical waveguide
• Single-ridged waveguide
• Double-ridged waveguide
The following figures show the types of waveguides.

## 电气工程代写|微波工程代写Microwave Engineering代考|Advantages of Waveguides

• 波导易于制造。
• 它们可以处理非常大的功率（以千瓦为单位）。
• 波导中的功率损耗可以忽略不计。
• 它们提供非常低的损耗（低 alpha 衰减值）。
• 当微波能量通过波导传播时，它的损耗比同轴电缆低。
波导的类型

有五种类型的波导。
• 矩形波导
• 圆形波导
• 椭圆波导
• 单脊波导
• 双脊波导
下图显示了波导的类型。

## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。

Posted on Categories:Microwave Engineering, 微波工程, 电气工程代写

## avatest™帮您通过考试

avatest™的各个学科专家已帮了学生顺利通过达上千场考试。我们保证您快速准时完成各时长和类型的考试，包括in class、take home、online、proctor。写手整理各样的资源来或按照您学校的资料教您，创造模拟试题，提供所有的问题例子，以保证您在真实考试中取得的通过率是85%以上。如果您有即将到来的每周、季考、期中或期末考试，我们都能帮助您！

•最快12小时交付

•200+ 英语母语导师

•70分以下全额退款

## 电气工程代写|微波工程代写Microwave Engineering代考|Microwaves – Introduction

Electromagnetic Spectrum consists of entire range of electromagnetic radiation. Radiation is the energy that travels and spreads out as it propagates. The types of electromagnetic radiation that makes the electromagnetic spectrum is depicted in the following screenshot.

Let us now take a look at the properties of Microwaves.
Properties of Microwaves
Following are the main properties of Microwaves.

• Microwaves are the waves that radiate electromagnetic energy with shorter wavelength.
• Microwaves are not reflected by Ionosphere.
• Microwaves travel in a straight line and are reflected by the conducting surfaces.
• Microwaves are easily attenuated within shorter distances.
• Microwave currents can flow through a thin layer of a cable.

Advantages of Microwaves
There are many advantages of Microwaves such as the following:

• Supports larger bandwidth and hence more information is transmitted. For this reason, microwaves are used for point-to-point communications.
• More antenna gain is possible.
• Higher data rates are transmitted as the bandwidth is more.
• Antenna size gets reduced, as the frequencies are higher.
• Low power consumption as the signals are of higher frequencies.
• Effect of fading gets reduced by using line of sight propagation.
• Provides effective reflection area in the radar systems.
• Satellite and terrestrial communications with high capacities are possible.
• Low-cost miniature microwave components can be developed.
• Effective spectrum usage with wide variety of applications in all available frequency ranges of operation.

## 电气工程代写|微波工程代写Microwave Engineering代考|Disadvantages of Microwaves

There are a few disadvantages of Microwaves such as the following:

Cost of equipment or installation cost is high.

They are hefty and occupy more space.

Electromagnetic interference may occur.

Variations in dielectric properties with temperatures may occur.

Inherent inefficiency of electric power.
Applications of Microwaves
There are a wide variety of applications for Microwaves, which are not possible for other radiations. They are –
Wireless Communications

For long distance telephone calls

Bluetooth

WIMAX operations

Outdoor broadcasting transmissions

Broadcast auxiliary services

Remote pickup unit

Studio/transmitter link

Direct Broadcast Satellite (DBS)

Personal Communication Systems (PCSs)

Wireless Local Area Networks (WLANs)

Cellular Video (CV) systems

Automobile collision avoidance system

## 电气工程代写|微波工程代写Microwave Engineering代考|Microwaves – Introduction

• 微波是辐射波长较短的电磁能的波。
• 微波不会被电离层反射。
• 微波沿直线传播并被导电表面反射。
• 微波很容易在较短的距离内衰减。
• 微波电流可以流过电缆的薄层。

• 支持更大的带宽，因此可以传输更多的信息。因此，微波用于点对点通信。
• 更多的天线增益是可能的。
• 带宽越大，传输的数据速率越高。
• 随着频率的提高，天线尺寸减小。
• 由于信号频率较高，因此功耗低。
• 使用视线传播可以减少衰落的影响。
• 在雷达系统中提供有效的反射区域。
• 具有高容量的卫星和地面通信是可能的。
• 可以开发低成本的微型微波元件。
• 在所有可用频率范围内的各种应用中的有效频谱使用。

WIMAX 操作

## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。