Radio Communications Principles and Applications

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Radio Communications Principles and Applications : 

20/08/2010 1 by Imran Hameed Radio Communications Principles and Applications

Aim of Today’s Lesson : 

20/08/2010 2 Aim of Today’s Lesson Develop an understanding of electromagnetic waves used for radio communication and the factors that affect reliable communication

Objectives of Today's Lesson : 

20/08/2010 3 Objectives of Today's Lesson Review The electromagnetic spectrum Characteristics of electromagnetic waves Polarisation Frequency, wavelength and velocity of propagation Modes of propagation Effect of Ionosphere Operation of antennas

Common Uses of Radio : 

20/08/2010 4 Common Uses of Radio 5 mins List 10 everyday uses of radio

Common Uses of Radio… : 

20/08/2010 5 Common Uses of Radio… I.D. Badge Tags SW Radio Broadcast Radio TV Model RC Intercom Microwave oven HF Asset tracking UHF Truck/Trailer ID Car door keys Garage door opener Bluetooth G P S Toll road tags Vehicle speed check Cordless phone Satellite TV Mike & Amps Emergency services WiFi

Radio Frequency Spectrum : 

20/08/2010 6 Radio Frequency Spectrum 5 mins Work in Pairs

Radio Frequency Classification : 

20/08/2010 7 Radio Frequency Classification ULF 300Hz – 3kHz VLF 3 – 30 kHz LF 30 – 300kHz MF 300 – 3,000kHz (3 MHz) HF 3 – 30MHz VHF 30 – 300MHz UHF 300 – 3,000 MHz (3GHz) SHF 3 – 30 GHz EHF 30 – 300 GHZ

Radio Frequency Spectrum : 

20/08/2010 8 Radio Frequency Spectrum

Electromagnetic Spectrum : 

20/08/2010 9 Electromagnetic Spectrum Managed by a number of bodies: Radio Communications Agency (UK) ITU – International Telecommunication Union ETSI European Telecommunications Standards Institute Stops user conflict Preserves user integrity

Slide 10: 

20/08/2010 10

Periodic Signals : 

20/08/2010 11 Periodic Signals

Sine Wave : 

20/08/2010 12 Sine Wave Peak Amplitude (A) maximum strength of signal volts Frequency (f) Rate of change of signal Hertz (Hz) or cycles per second Period = time for one repetition (T) T = 1/f Phase () Relative position in time

Slide 13: 

20/08/2010 13

Slide 14: 

20/08/2010 14

Practice Exercise : 

20/08/2010 15 Practice Exercise Draw the Sine waves with following data: A = 2 , F = 2 and  = 0 A = 2.5 , F = 3 and  = 180 degrees

Wavelength() : 

20/08/2010 16 Wavelength() Distance occupied by one cycle Distance between two points of corresponding phase in two consecutive cycles Assuming signal velocity v  = vT f = v c = 3*108 ms-1 (speed of light in free space)

Practice Questions. . . : 

20/08/2010 17 Practice Questions. . . Radio wave has 30m wavelength & 10MHz frequency What is it’s Velocity? Radio wave has 12.3m Wavelength and 3 x10^8 m/sec What is it’s frequency?

Solution : 

20/08/2010 18 Solution A1. V = Freq x Wavelength So V = 10x10^6 x 30m = 3x 10^8metres / sec A2. Freq = Velocity / Wavelength = (3 x 10^8 cps) / 12.3m = 24.39 MHz

Group Activity : 

20/08/2010 19 Group Activity Time: 20 – 30 mins Group size: 4 Research the topic given and prepare a brief presentation. (10 mins) Presentations (20 mins)

What We have achieved…. : 

20/08/2010 20 What We have achieved…. Electromagnetic Spectrum Classification of Frequency bands Characteristics of bands between 3KHz to 90 GHz Relationship between frequency, wavelength and velocity of propagation

Break (15 mins) : 

20/08/2010 21 Break (15 mins)

Antennae : 

20/08/2010 22 Antennae

Antenna : 

20/08/2010 23 Antenna is an electrical conductor or system of conductors. is a device whose function is to radiate electromagnetic energy or to intercept electromagnetic radiation Transmission - radiates electromagnetic energy into space Reception - collects electromagnetic energy from space

Group Activity : 

20/08/2010 24 Group Activity Time - 30 mins Group Size – 5 Topics: Antenna Radiations Electric and magnetic field Planes of Polarization Sinusoidal waveforms Gain & Front to back ratio Types of Antenna Unipole Monopole Dipole Yogi array

Review and Feedback : 

20/08/2010 25 Review and Feedback

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