Download - Introduction to Antennas - Familiarization
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1Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 1
Introduction to Antennas:
Familiarization
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2Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 2
Definition of Antenna (or Aerial)
A means of radiating or receiving radio
waves
An interface between a circuit and free
space
A transducer which converts time-varying
currents to photons and vice-versa
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3Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 3
R F Bands Microwave BandsName Frequency Name Frequency
ELF 3 – 30 Hz L 1 – 2 GHz
SLF 30 – 300 Hz S 2 – 4 GHz
ULF 300 – 3 KHz C 4 – 8 GHz
VLF 3 – 30 KHz X 8 – 12 GHz
LF 30 – 300 KHz KU 12 – 18 GHz
MF 300 K – 3 MHz K 18 – 26 GHz
HF 3 – 30 MHz KA 26 – 40 GHz
VHF 30 – 300 MHz V 40 – 75 GHz
UHF 300 M – 3 GHz W 75 –100 GHz
SHF 3 – 30 GHz
EHF 30 – 300 GHz
Frequency Bands in EM Spectrum
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4Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 4
Introduction to Antennas
Through Images
Frequency -vs- Wavelength; Photon Energy
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5Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 5
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6Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 6
Some Typical Antennas
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7Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 7
Some Typical Antennas
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8Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 8
Some Typical Antennas
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9Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 9
Some Typical Antennas
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10Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 10
Radomes
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11Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 11
Ship-borne Antennas
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12Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 12
Aircraft-borne Antennas
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13Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 13
Aircraft-borne Antennas
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14Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 14
Antennas on a Cruise-Missile(not marked)
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15Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 15
Satellite-borne Antennas
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16Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 16
The Pioneers in Antennas
JC Maxwell H R Hertz
JC Bose
G Marconi
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17Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 17
First Trans-Atlantic Transmission
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18Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 18
Marconi’s Transmitting Station (Poldhu)
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19Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 19
Plaque Commemorating
Poldhu Transmitting Station
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20Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 20
Prof. HidetsuguYagi
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21Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 21
Prof. John D. Kraus
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22Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 22
Antenna (BIG EAR) built by Prof. John D. Kraus and his students
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23Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 23
Microstrip Antennas
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24Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 24
Microstrip Antennas
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25Presented by APN Rao, Dept ECE, GRIET, Hyderabad. Jul 2011 25
History of Development of Antennas
1864 - Existence of EM waves Predicted (JC Maxwell)
1886 – EM waves generated and detected (HR Hertz)
1901 – First Trans-atlantic wireless communication (G Marconi)
Prior to WW II – Wire antennas (below UHF range)
During WW II – Microwave antennas, power sources and other components
Following WW II – Array, Broadband & MicrostripAntennas
Later part of XX century – Advanced numerical methods and computational softwares, Smart antennas