INTERNALEMBEDDED ANTENNAS

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INTERNAL/EMBEDDED ANTENNAS

• MORE COMPACT DESIGN
• SAVES SPACE
• MORE RUGGED LESS SUSCEPTIBILITY TO DAMAGE

From http// www.centurion.com
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SUITABLE CANDIDATES

• PIFA (PLANAR INVERTED-F ANTENNA)
• MEANDER LINE ANTENNA

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POSSIBLE LOCATIONS OF PIFA ON HANDSET
From FDTD Analysis of PIFA diversity antennas
on a hand-held transreceiver unit by Michael A.
Jensen and Yahya Rahmat-Samii
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SIDE AND FRONT VIEW OF PIFA
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RADIATION PATTERN OF PIFA IN DIFFERENT PLANES
From Integrated Antennas for Hand-held
Telephones with low Absorption by Gert Frolund
Rendersen, Jorgen Bach Andersen
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REDUCTION OF ANTENNA SIZE

• UNIVERSE MAY BE EXPANDING BUT THE SIZE OF
  ANTENNAS IN MOBILE PHONES IS SHRINKING.

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WHY SMALLER ANTENNAS ?

• HANDSET SIZE LIMITED BY THE SIZE OF BATTERY AND
  THE SIZE OF THE ANTENNA
• NEED TO HAVE MORE THAN ONE ANTENNA TO RECEIVE
  SIGNALS OF DIFFERENT POLARISATIONS

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CAPACITIVELY LOADED PIFA

• USUALLY LENGTH IS (L/4).
• IT REDUCES IT TO (L/8).

From A capacitively loaded PIFA for compact
mobile telephone Handsets by Corbett R. Powell,
Student Member IEEE, and R.D. Murch, Member IEEE
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LOADED PIFA
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NEED FOR DUAL BAND OPERATION

• PCS(PERSONAL COMMUNICATION SYSTEMS) REQUIRE
  MOBILE PHONES TO WORK AT 1800 MHz ALONGWITH THE
  USUAL 900 MHz BAND.

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DUAL BAND PIFA 1
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TRIPLE BAND PIFA
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MEANDER LINE CONSTRUCTION
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RADIATION PATTERN OF MEANDER LINE ANTENNA
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PIFA WITH MEANDER LINES
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DIVERSITY ANTENNAS
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BPFA
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COMPARISON OF CURRENT DISTRIBUTIONS
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COMPARISON OF RADIATION PATTERN
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DTSA CONSTRUCTION AND RADIATION PATTERN
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COMPARISON WITH MONOPOLE IN TERMS OF SAR
DISTRIBUTION