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

# 电气工程代写|微波工程代写Microwave Engineering代考|ECE453 Microwaves – Rat-race Junction

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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.

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