Download - Cell Phone Antennas
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NAVEEN KUMAR ●Teacher ●Researcher ●
Technophile
Cell Phone Antennas
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Contents
Cell Phone Antennas
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The Icebreaker: First Cell Phone Facts about the first cell phone Trends in Cell-Phone Development Antenna – An Introduction Types of Antennas used in Cell phones
Retractable Monopole Antenna Helical Antenna Intenna Planar Inverted-F Antenna (PIFA)
● Antennas in some of Today’s Smartphones● SAR Measurement● Advancements & Future Technologies● References
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The Icebreaker: First Cell-Phone3
Dr. Martin Cooper at Motorola Inc.
Thin phone: 7.2 [mm]
Motorola ULTRA
Cell Phone Antennas
DynaTAC
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The first DynaTAC
phone weighted
around 2.2 Kgs (ap-prox.)
The bat-tery life
would last for only 20 minutes
Nicknamed the
‘The BRICK’
Its cost was
around 4,000 US Dollars
Cell Phone Antennas
Quick Facts About the First Cell Phone
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Trends in Cell-Phone Development5
Cell Phone Antennas
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Antenna- An Introduction6
An Antenna converts electromagnetic radiation into electric
current, or vice versa.
Need of Antenna :
For transmission and reception of the radio signal.
Antennas are required by any radio receiver or transmitter to
couple its electrical connection to the electromagnetic field.
Cell Phone Antennas
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Types of Antennas used in Cell Phones7
Following are some of the antennas used in cellular phones:
External Antennas
Retractable Monopole (whips) antennas
Helical antennas
Internal Antennas
Microstrip antennas (MSA)
Planar inverted-F antennas (PIFA)
Cell Phone Antennas
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Retractable Monopole Antenna8
An antenna that we can retract.Basically a dipole antenna with top loading
(looks like a hat)
Cell Phone Antennas
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Helical (Stubby) Antenna9
When we open a cap, we can see a helical antenna. (looks like a spring)
We don’t have to retract. → It is convenient for users.
Cell Phone Antennas
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Ceramic Helical Antenna10
High permittivity → Small antenna size
Cell Phone Antennas
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Intenna11
Internal antenna: The antenna is embedded inside the phone which is not visible to us.
A phone case is strongly related to an intenna.
Cell Phone Antennas
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Intenna for 3G Phone12
A metal strip pattern is served as an antenna.
Cell Phone Antennas
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Planar Inverted F Antenna (PIFA)13
Radiator Signal Input
CoaxialCable
Original Form
PIFA
Integrated PIFACell Phone Antennas
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Triple-Band Antenna14
Intenna: internal antennaResonance: 900, 1800, 1900 [MHz]
Cell Phone Antennas
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PIFA for Cell-Phone15
Cell Phone Antennas
Resonance Graph
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PIFA for Notebook16
Cell Phone Antennas
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Antennas for Galaxy Nexus & Galaxy S17
Cell Phone Antennas
Galaxy Nexus Galaxy S
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Apple’s Antennagate18
Death grip: when we touch a certain part of an iPhone 4, the ongoing call may gets dropped.
Stainless steel frame as multi-band antennas.
Iphone 4Cell Phone Antennas
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SAR Measurement19
SAR: Specific Absorption RateOur brain can absorb Electromagnetic (EM) power.
The SAR measures how much power our head absorbs.
Cell Phone Antennas
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Advancements & Future Technologies
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References
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1) Kin-Lu Wong, “Planar Antennas for Wireless Communication”, Published by John
Wiley & Sons, Inc., Chapter: 2, Pages: 26-65, 2003.
2) C. Rowell, E.Y. Lam, “Mobile-phone antenna design”, IEEE Antennas and Propagation
Magazine, Vol. 54, No. 4, Page(s): 14 – 34, 2012.
3) Images from shutterstock.com, antenna-theory.com, istockphoto.com, empire.de,
antenova.com, nearfield.org, gsmarena.com.
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Cell Phone Antennas 22
Any Questions/Queries...
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Where to find me..
/chd.naveen
@saini_naveen87
/NaveenKumar11
www.elixir-india.com
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Cell Phone Antennas 24