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Welcom

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Welcom

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Our topic Our topic is-is-Impact of waves on Wireless Impact of waves on Wireless Communication Communication

To Our..To Our.. Presentation.

Presentation.

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Submitted BySubmitted By Group=‘‘Group=‘‘STARSSTARS””

• Sheikh Mohammad Shahnoor-12410224

• Abdur Rahim Bhuyian- 12410206

• MD Hanif Sardar- 12310426

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What is wireless Communication?What is wireless Communication?

Transmitting voice and data using Transmitting voice and data using electromagnetic waves in open space electromagnetic waves in open space (atmosphere) (atmosphere)

Electromagnetic WavesElectromagnetic Waves - - Travel at speed of light (c=3*10^8Travel at speed of light (c=3*10^8 m/s)m/s) -Higher frequency means higher energy photons.-Higher frequency means higher energy photons. -The higher the energy photon the more penetrating -The higher the energy photon the more penetrating

is the radiation.is the radiation.

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Types Of wireless communicationTypes Of wireless communication::

Point to point-Point to point-

Mult i-point -Mult i-point -

BroadcastBroadcast

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Basic Waves involved in communicationBasic Waves involved in communication

The 3 basic waves areThe 3 basic waves are --Radio WavesRadio Waves

-Infrared Waves--Infrared Waves-

--Micro WavesMicro Waves

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Picture of the 3 communicative Waves

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How waves help in mobile communicationHow waves help in mobile communication

1.RADIO WAVE-1.RADIO WAVE-The broadcast of every radio and television programme involves the use of radio waves.

.Radio waves are the type of electromagnetic waves with the longest wavelengths

micro-wavesradio waves infrared

1000 m 1 mm1 m 0.001 mm

ultra-violet

wavelength of electromagnetic waves

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radio wave radio wave

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How are radio waves produced?

- Radio waves are produced

by Passing an oscillating

electric current through a

long wire called an aerial.

-The frequency of the

radio wave produced is

the same as the

frequency of the

oscillating current.

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MICRO WAVE-

2.Every mobile phone conversation involves the transmission of microwave signals.

-The wavelength of microwaves ranges from 30 cm (the length of a standard ruler) to 1 mm (about the size of a full stop).

Micro waves are widely used for one to one communication between sender and receiver, cellular phone, satellite networks and in wireless LANs

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How microwave produced?How microwave produced?

Long-wavelength microwaves are produced by aerials in a similar way to other radio waves. These types of microwaves are used for communications.

Short-wavelength microwaves are produced using a device called a magnetron.

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Micro WAVE signal

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3. Infrared WAVEInfrared radiation is a form of electromagnetic radiation that lies between microwaves and visible light on the electromagnetic spectrum.

Electromagnetic waves having frequencies from 300 GHz to 400 THz are also called IR waves or Infrared waves.It also use in optical fibre as well.

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How it is transmitted?

IR waves are used for short range communication and use line of sight propagation.

Infrared waves cannot pass through solid objects, like walls and be easily contained in a room.

They are cheap, easy to build and do not require any government license to use them.

IR waves offer very bandwidth for use.

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Infrared WavesInfrared Waves

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Effects !

Radiofrequency Ranges (10 kHz to 300 GHz)

Effects only possible at ten times the permissible exposure limit

Heating of the body (thermal effect) Cataracts Some studies show effects of teratoginicity

and carcinogenicity. -Reduces fertility in male

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