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This video is about how antennas work. An antenna converts an electric signal into an electromagnetic wave, which then propagates forward. The video explains how this works in detail, including how the size of the antenna affects the frequency of the propagation.

  • 00:00:00 An antenna is widely used in the field of telecommunications, which we have seen in many previous videos in this series. An electromagnetic wave is converted into an electrical signal and is radiated as an electromagnetic wave. In this video, we are going to see the science behind antennas. We have an electric signal as the wave is converted into an electromagnetic wave. You could have a simple response in your mind, which is to use a closed conductor and the principle of electromagnetic induction to create a magnetic field and electric field around it. However, this fluctuating field around the source does not propagate signals, but fluctuates around the source. In an antenna, the electromagnetic waves must be separated from the source and must propagate forward of us to understand how an antenna is made. We are going to understand the physics behind the separation of waves and consider a positive and negative charge placed at a distance, which is known as a dipole. This arrangement creates a electric field as shown in the middle of its trajectory. Now, we consider that these charges are oscillating and the speed will be maximum and the ends of their trajectories will have zero speed. These particles experience an acceleration and decelerationContinuous due to this variation in speed, the
  • 00:05:00 In this video, the frequency of the signal applied as the propagation travels at the speed of light can be easily calculated. The length of the wave of propagation for a perfect transmission can be found by dividing the length of the antenna by the wavelength of the propagation. The function of the antenna is reversible and can function as a receiver if an electromagnetic field of propagation hits it. In detail, take the same antenna and apply an electric field to this instante the electrons will accumulate in an extremity of the wire this is the same as a dipole electric circuit at a constant voltage is accumulating positive and negative charges in the other extremities the accumulation of variable voltage means that there is an electric voltage signal in the center of the antenna this is the output when the antenna operates as a receiver the frequency of the voltage output is the same as the frequency of the wave received by the antenna's configuration of electric field is released clearly that for a perfect reception the size of the antenna must be the half of the wavelength. In all these discussions, we have seen that the antenna is an open circuit. Now let's look at some practical antennas and how they work. In the past, antennas for television reception weren't used with hypo antennas. The color bar acts as a

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