internal/embedded antennas more compact design: saves space more rugged: less susceptibility to...
TRANSCRIPT
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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 telephoneHandsets’’ 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