English Speech-Report-Activity Dialogue Transcript about Radar Technology1 WWelltoday we have Professor chen and professor wei in our studio to talk about the Radar technicalgood afternoon professors

er second. By measuring the time delay between the transmission of a short pulse of radiation and the reception of its reflection, we can determine the distance of the reflecting object. This is the basic principle of radar. In addition, by analyzing the characteristics of the reflected signal, we can obtain information about the size, shape, and movement of the object. This allows us to identify the target and track its movement. 7 W2: What is the Cavity Magnetron and how does it work in radar technology? The Cavity Magnetron is a device that generates high power high frequency electromagnetic pulses, which are used in radar to transmit and receive signals. It was invented by John Randall and Harry Boot at the University of Birmingham in England in 1940. The Cavity Magnetron consists of a cylindrical chamber with a cathode and an anode, and a series of resonant cavities. When a high voltage is applied to the cathode, electrons are emitted and accelerated towards the anode. As they pass through the resonant cavities, they induce a high frequency electromagnetic field, which is then coupled out of the device as a pulse of radiation. The Cavity Magnetron revolutionized radar technology by making it possible to generate high frequency signals with high power and efficiency. 8 W: Thank you, professors, for your insights into the Radar technology. It’s been a pleasure having you here