NAVEEN KUMAR ●Teacher ●Researcher ●
Technophile
Cell Phone Antennas
Contents
Cell Phone Antennas
2
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
The Icebreaker: First Cell-Phone3
Dr. Martin Cooper at Motorola Inc.
Thin phone: 7.2 [mm]
Motorola ULTRA
Cell Phone Antennas
DynaTAC
4
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
Trends in Cell-Phone Development5
Cell Phone Antennas
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
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
Retractable Monopole Antenna8
An antenna that we can retract.Basically a dipole antenna with top loading
(looks like a hat)
Cell Phone Antennas
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
Ceramic Helical Antenna10
High permittivity → Small antenna size
Cell Phone Antennas
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
Intenna for 3G Phone12
A metal strip pattern is served as an antenna.
Cell Phone Antennas
Planar Inverted F Antenna (PIFA)13
Radiator Signal Input
CoaxialCable
Original Form
PIFA
Integrated PIFACell Phone Antennas
Triple-Band Antenna14
Intenna: internal antennaResonance: 900, 1800, 1900 [MHz]
Cell Phone Antennas
PIFA for Cell-Phone15
Cell Phone Antennas
Resonance Graph
PIFA for Notebook16
Cell Phone Antennas
Antennas for Galaxy Nexus & Galaxy S17
Cell Phone Antennas
Galaxy Nexus Galaxy S
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
SAR Measurement19
SAR: Specific Absorption RateOur brain can absorb Electromagnetic (EM) power.
The SAR measures how much power our head absorbs.
Cell Phone Antennas
Advancements & Future Technologies
Cell Phone Antennas
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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.
Cell Phone Antennas 22
Any Questions/Queries...
23
Where to find me..
/chd.naveen
@saini_naveen87
/NaveenKumar11
www.elixir-india.com
Cell Phone Antennas 24
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