How does an antenna work??

                   Antenna

            

                Antenna is widely used in the field of telecommunication and we have already seen in many applications 

antenna receives the an electromagnetic waves and converts it to an electric signal or receive an electric signals and radiate it as an electromagnetic waves 

In this article we look science behind the antenna we have an electromagnetic waves how we converts to an electromagnetic wave 

                

Consider a positive and negative charge placed at a distance this arrangement know as dipole we know they can produce electric field assume this charges are oscillating (up and down) lets consider one electric field line the wave form formed at t=0 expands as shown after 1/8th time period

The wave front meet at a single point after then they produce another wavefront you can see in below image

In this manner separation and propagation wave front happen please note that this varying electric field will automatically Generate a varying magmatic field perpendicular to it. the wave propagation is sinusoidal in nature this is exactly happen in antenna for perfect transmission the length of antenna shall be half of the wavelength doing reverse process it can work as receiver

Now let's see some practice antenna and how they work

Yagi uda antenna

In past dipole antennas were used for tv reputation this complete stature is known as yagi uda antenna the dipole of antenna converts received signal into electrical signals this electrical signals carried by coaxial cable of TV unit .

Now a days we moved to dish TV antenna this consists of two main components 

 Dish tv antenna

Parabolic reflector ,low noise block ,down converter the parabolic fish receives the electromagnetic signal from satellite and focus then onto the LMBF

The voltage signal so generated is fed to signal processing such as filtration conversation from high to low frequency and amplification ... carried to tv with the help of coaxial cable in our mobile we have completely different antenna 

Mobile antenna

.a patch antenna consists of metallic patch or strip with a piece of dielectric material in between the length of metallic patch is half of the wavelength for proper transmission and reputation .

Thank you for reading this article.