Features There are many paths for data communication. It allows for the sharing of data across large geographical area. It doesn't use cables rather it uses radio signals for data communication. Types of Unguided Transmission Media Microwave System : is an unguided transmission media in which data travels in the form of high-speed radio signals in a straight line between two points antennae.
Antennae are compulsory. Communication satellites : help to transmit information from one place to another using satellites. Radio signal is first transmitted by a ground station to a satellite. The satellite in the space receives it and transmits to another station located in the Earth. Infrared: is another unguided transmission media that uses infrared technology to transmit data only when the transmitter is pointed towards the receiver. Antennae are not compulsory. Bluetooth : allows data transmission between computing devices within a small geographic area of 10m using wireless connections.
It uses a frequency band of 2. Wi-Fi : Wireless Fidelity is a popular unguided or wireless transmission media that allows transmission of data across a large geographical area by establishing connections between computing devices. Bit Rate Bit rate is defined as the amount of bits transmitted from the source to the destination per unit time here, time is usually seconds. Bandwidth Bandwidth refers to the amount of data expected to be transmitted per second.
Difference between Bit and Bandwidth The major difference is that Bandwidth refers to the potential of data transmission whereas Bit Rate refers to the actual speed of data transmission. You may like these posts. You can let us know your questions in the comments section as well. Grade 09 - Oasis School Science. Grade 10 - Oasis School Science. Grade 10 - Compulsory Mathematics. Grade 10 - Computer Science. Grade 10 - readmore Optional Mathematics.
Grade 10 - vedanta Excel in Mathematics. Also, the distance covered by the signal is directly proportional to the height of the antenna. Basically, we used Microwaves in mobile phones communication and television distribution. Unlike radio waves, they are unidirectional, as they can move in only one direction, and therefore it is used in point-to-point communication or unicast communication such as radar and satellite.
Uses: Microwaves are used in mobile phones communication and television distribution. Advantage and Disadvantage: If we talk about the advantages of microwaves then we say that it is a very fast way of communication, that can carry voice channels at the same time. Also, it is a wireless communication medium so there is no need of digging and spreading wires.
Now demerits of microwaves are the first expense, their installation and maintenance are very expensive. Moreover, Microwaves are also not very effective in bad weather conditions. Comparison of Infrared, Radio waves, Microwaves S.
In science, the Infrared is part of a spectrum that is not visible to the human eye Radio waves are the type of wireless communication that can travel large distances as well as can penetrate any wall Microwaves are a line of sight transmission, meaning both the antennas sending and receiving should be properly aligned.
The frequency range of infrared rays GHz — THz It can travel large distances as well as can penetrate any wall Omni-directional, They are unidirectional, as they can move in only one direction, and therefore it is used in point-to-point communication or unicast communication such as radar and satellite. If we talk about the advantages of microwaves then we say that it is a very fast way of communication, that can carry voice channels at the same time.
Advantages of microwaves then we say that it is a very fast way of communication, that can carry voice channels at the same time. Microwaves are used in mobile phones communication and television distribution. Sample Question Question 1: Write a short note on Microwaves. Solution Microwaves are a line of sight transmission, meaning both the antennas sending and receiving should be properly aligned.
Question 2: What do you mean by wireless communication. Give examples. Solution It is also referred to as Unguided Media or Unbounded transmission media. No physical medium is required for the transmission of electromagnetic signals. In wireless communication we can transfer our message through the air, water or vacuum i.
Question 3: What is the frequency range of Infrared rays Radio waves, Microwave waves. Skip to content. Change Language. Microwaves can have wavelength ranging from 1 mm — 1 meter and frequency ranging from MHz to GHz. Microwave antennas concentrate the waves making a beam of it. As shown in picture above, multiple antennas can be aligned to reach farther. Microwaves have higher frequencies and do not penetrate wall like obstacles. Infrared wave lies in between visible light spectrum and microwaves.
It has wavelength of nm to 1-mm and frequency ranges from GHz to THz. Infrared travels in a straight line hence it is directional by nature. Because of high frequency range, Infrared cannot cross wall-like obstacles. Highest most electromagnetic spectrum which can be used for data transmission is light or optical signaling.
Because of frequency light uses, it tends to travel strictly in straight line. Hence the sender and receiver must be in the line-of-sight. Because laser transmission is unidirectional, at both ends of communication the laser and the photo-detector needs to be installed.
Laser beam is generally 1mm wide hence it is a work of precision to align two far receptors each pointing to lasers source. Lasers cannot penetrate obstacles such as walls, rain, and thick fog.
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