INTERNAL/EMBEDDED ANTENNAS

MORE COMPACT DESIGN:

SAVES SPACE MORE RUGGED:

LESS SUSCEPTIBILITY TO DAMAGE

From: http:// www.centurion.com

SUITABLE CANDIDATES PIFA (PLANAR INVERTED-F

ANTENNA) MEANDER LINE ANTENNA

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

SIDE AND FRONT VIEW OF PIFA

RADIATION PATTERN OF PIFA IN DIFFERENT PLANES

From: “Integrated Antennas for Hand-held Telephones with low Absorption’’ by Gert Frolund Rendersen, Jorgen Bach Andersen

REDUCTION OF ANTENNA SIZE

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

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…

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

LOADED PIFA

NEED FOR DUAL BAND OPERATION

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

DUAL BAND PIFA 1

TRIPLE BAND PIFA

MEANDER LINE CONSTRUCTION

RADIATION PATTERN OF MEANDER LINE ANTENNA

PIFA WITH MEANDER LINES

DIVERSITY ANTENNAS

BPFA

COMPARISON OF CURRENT DISTRIBUTIONS

COMPARISON OF RADIATION PATTERN

DTSA CONSTRUCTION AND RADIATION PATTERN

COMPARISON WITH MONOPOLE IN TERMS OF SAR DISTRIBUTION