Antenna

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Antenna

  1. 1. CONTENTS WHAT IS ANTENNA TRANSMITTER ANTENNA RECEIVER ANTENNA YAGI-UDA ANTENNA LOG – PERIODIC ANTENNA HELIX ANTENNA PARABOLIC ANTENNA LOOP ANTENNA ANTENNA ARRARY
  2. 2. ANTENNA An antenna is an electrical device which converts electric energy into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. An antenna is a device for sending or receiving electromagnetic waves.
  3. 3. TRANSMITTER ANTENNAA device that convertssound, light, or electricalsignals into radio,microwave, or otherelectrical signals .
  4. 4. RECIVER ANTENNAAn antenna used to convertelectromagnetic waves in toelectrical energy.
  5. 5. TYPES OF ANTENNA YAGI – UDA ANTENNA LOG – PERIODIC ANTENNA HELIX ANTENNA PARABOLIC ANTENNA LOOP ANTENNA
  6. 6. YAGI – UDA ANTENNA Yagi-Uda antenna consist of reflector, director and driven element. It is unidirectional antenna. Frequency range – 300MHz-3GHz
  7. 7. Seven element Yagi – Uda
  8. 8. Yagi – Uda advantage High gain and good front to back ratio. It has narrow bandwidth. It is fixed frequency device. Grater directivity due to director and reflector.
  9. 9. Log - periodic antenna A unidirectional antenna in which the length and spacing of the elements increase logarithmically from one end to the other. It is frequency-independent antenna. Frequency range – VHF and UHF band.
  10. 10. Log – Periodic Antenna
  11. 11. Advantages It is broadband antenna. It is unidirectional antenna. It is frequency independent antenna.
  12. 12. HELIX ANTENNA A conducting wire in the form of screw thread fed by power source. The feed line is connected between the bottom of the helix and the ground plane. Helix antenna is Omni directional. Frequency range – VHF and UHF band.
  13. 13. Helix Antenna
  14. 14. Application Satellite communication. Space communication & space probes. For telemetry applications.
  15. 15. PARABOLIC REFLECTORANTENNA This is used to convert spherical wave into plane wave The feed antenna is called primary antenna and reflector is secondary antenna. Frequency range - 3GHz-30GHz
  16. 16. Parabolic Reflector Antenna
  17. 17. Application Radar communication. Satellite communication.
  18. 18. LOOP ANTENNA A directional-type antenna consisting of one or more complete turns of a conductor. It determine the direction of arrival of radio signals. Frequency range – 500-1600KHz.
  19. 19. Loop Antenna
  20. 20. Application Direction finding of signal propagation. Radio(AM/FM)reception. Long distance point to point communication.
  21. 21. Antenna Arrays Arrays are used to increase diretivity and gain in desired direction. Eliminate the radiation in undesired direction.
  22. 22. Broadside Array If the direction of maximum radiation is generated is perpendicular is called broadside array. Each antenna is fed by the current of same magnitude and phase. Radiation pattern is bidirectional.
  23. 23. Broad side array
  24. 24. End Fire Array If the maximum radiation is generated parallel to the antenna array axis is called end fire array. Each antenna is fed by the current same magnitude and opposite phase. Radiation pattern is bidirectional.
  25. 25. End fire array
  26. 26. CONCLUSION All the antenna are very useful in all the application such as transmitter and receiver. Antenna are used to convert electrical energy to electromagnetic energy.

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