Hello friends welcome to HiTech BabaJi- Simply Read & Learn. Today we will discuss about Antenna Basics & Various Types of Antennas.
ANTENNAis a device which converts electromagnetic
radiations from space into electrical currents in conductors and electrical
currents from conductors into electromagnetic radiations in space. So we can say an Antenna is a metallic structure or conductor or wire that receives or transmits radio waves.
Antenna comes in different shapes and sizes from little one to really big one. Little one which can be found on your mobile phones and really big one which receives signals from satellites, about 36000 kms away from earth surface and from deep space also.
Antennas may be divided into various categories depending upon physical structure, frequency of operation and their applications. Some of the important types of Antennas are:
1. Wire Antenna
2. Aperture Antenna
3. Reflector Antenna
4. Lens Antenna
5. Microstrip Antenna
6. Array Antenna
Wire Antenna : Wire antennas are the basic types of antennas. These are well known and widely used antennas. The following are the examples of wire antenna :
a) Dipole
b) Monopole
c) Helix
d) Loop
Applications of Wire Antenna : Personal applications like antenna at rooftop of buildings, at rooftop of automobiles, in aero planes, aircrafts and space crafts.
Aperture Antenna:
An Antenna with an aperture at the end can be termed as an Aperture antenna. Waveguide is an example of aperture antenna. The edge of a transmission line when terminated with an opening, radiates energy. This opening which is an aperture, makes it an Aperture antenna.
The main types of aperture antennas are −
Wave guide antenna
Horn antenna
Slot antenna
Aperture Antennas are used in the space communications where radiation losses are required to be very low.
Reflector Antenna: An antenna reflector is a device that reflectselectromagnetic waves. Antenna reflectors can exist as a standalone device for redirecting radio frequency (RF) energy, or can be integrated as part of an antenna assembly.
Parabolic antenna is distinguished by their shapes and size. Parabolic antenna is an antenna use a parabolic reflector. This parabolic or curved reflector surface directs the radio waves to its focal point. The most common shapes are dish antenna. The main advantage of dish antenna is its high directivity and gain.
The types of parabolic antennas are:
a) Axial or front feed or prime focus dish antenna
VHF vs UHF - What's the difference // Basic VHF and UHF Fundamentals// What to Look For in a VHF Radio// uhf vs vhf two way radios Today I have taken a very important topic for beginners that is basic difference between VHF and UHF Radios VHF stands for very high frequency and UHF stands for Ultra high frequency. So today we will discuss about the very high frequency radios and Ultra high frequency radios. Radios are also known as walkie-talkie in general. if you are looking for a radio (walkie-talkie) and you are not able to decide whether UHF or VHF radio can serve your purpose then this is going to be very useful for you. VHF Radios : when we talk about the vhf frequency it means that we are talking about frequency from 30 megahertz to 300 megahertz. In this most important services are:- 1. Broadcasting services 2. Aeronautical and Maritime services 3. Amateur and Amateur Satellite Services Frequency from 87-108 MHz is identified for the br
Let us start with a very basic question. What is satellite ? Satellite is nothing but an object that moves around another large object. For example: - Moon moves around the earth and earth is comparatively larger than moon, hence moon is a satellite of earth. Now, next question which immediately comes I our mind, what is GSAT, INSAT satellite frequently in news. So, to answer this. We will discuss categories of satellites. Satellites can be divided into two categories. 1. Natural satellites 2. Artificial satellites like GSAT- 30 satellite and satellites of INSAT series. Now we will discuss the importance of satellite communication. 1. Wide coverage i.e. very large area of earth is visible from satellites and ideally with the help of 3 geo-stationary satellites the most of the parts of the earth is visible except polar region. We can say that the combination of 3 satellites, with the ability to relay message from one to other could inter connect virtually al
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