Wireless communication by waves
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The document discusses the impact of waves on wireless communication, detailing the types of electromagnetic waves used, including radio waves, microwaves, and infrared waves. It explains how these waves facilitate mobile communication and outlines their production methods and characteristics. Additionally, it addresses potential health effects associated with exposure to radiofrequency ranges.
Wireless communication by waves
- 1. e om lc e W … To Our.. Pr es en ta tio n. Our topic is-Impact of waves on Wireless Communication 1
- 2. Submitted By Group=‘‘STARS” • Sheikh Mohammad Shahnoor-12410224 • Abdur Rahim Bhuyian- 12410206 • MD Hanif Sardar- 12310426 2
- 3. What is wireless Communication? Transmitting voice and data using electromagnetic waves in open space (atmosphere) Electromagnetic Waves - Travel at speed of light (c=3*10^8 m/s) -Higher frequency means higher energy photons. -The higher the energy photon the more penetrating is the radiation. 3
- 4. Types Of wireless communication: Point to point- Multi-point - Broadcast 4
- 5. Basic Waves involved in communication The 3 basic waves are -Radio Waves -Infrared Waves-Micro Waves 5
- 6. Picture of the 3 communicative Waves 6
- 7. How waves help in mobile communication 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 radio waves 1000 m microwaves infrared ultraviolet 1m 1 mm 0.001 mm wavelength of electromagnetic waves 7
- 8. radio wave 8
- 9. 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. 9
- 10. 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 10 wireless LANs
- 11. 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. 11
- 13. 3. Infrared WAVE Infrared 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. 13
- 14. 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. 14
- 16. 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 16
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