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Phased array antennas for mobile earthstations.

GROUP MEMBERS

WAQAR UL HASSAN

SULEMAN JAMIL

MUHAMMAD HUSNAIN

ARSALAN HABIB

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INTRODUCTION

} The mission of satellite is not only to improve theenvironment for mobile-phone basedcommunications, but also to contribute to thedevelopment of technologies for a satellite-based

multimedia broadcasting system for mobiledevices.

} It will play as important role in the provision ofservices and information, such as the transmission

of CD-quality audio and video; more reliable voiceand data communications; global positioning ofmoving objects such as cars, broadcasting.

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MOBILE SATELLITE COMMUNICATION

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Typical configuration of mobile satellitecommunications

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PHASED ARRAY ANTENNA FOR MOBILE

COMMUNICATION

} A phased array antenna has been considered themost favorite candidate for mobile communication.

} Because phase array antenna contain manyattractive characteristics such as :

Low and compact profile,

High-speed tracking,

Potentially low cost performance for vehicleantennas in mobile communications.

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Typical gain for L band satellitecommunications

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Usage:} The phased array is used for instance in optical

communication as a wavelength-selective splitter.} Broadcasting

} In broadcast engineering, phased arrays are requiredto be used by many AM broadcast radio stations to

enhance signal strength and therefore coverage inthe city of license, while minimizing interference toother areas.

} Phased array radar systems are also used bywarships of many navies. Phased array radars allow a

warship to use one radar system for surface detectionand tracking (finding ships), air detection andtracking (finding aircraft and missiles) and missileuplink capabilities.

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Visuals of Phase Array Antennas

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Phased Array Antenna of Satellite

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Types of Phase Array AntennasThere are two main different types of phased arrays, also

called beam formers

Time Domain Beam formers

A time domain beam former works, as the name says, bydoing time-based operations. The basic operation is called

"delay and sum". It delays the incoming signal from eacharray element by a certain amount of time, and then addsthem together

Frequency Domain Beam former

There are two different types of frequency domain beamformers. The first type separates the different frequencycomponents that are present in the received signal intodifferent frequency bins (using either an FFT or afilterbank).

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Conclusions:

} Effective

} Vast Applications

} Flexible in Design

} Support High speed transmission

} Accurate in warfare

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Recommendations

} Improvements in range

} Power Requirements

} Reduction in size

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References

} ^ Worlds Most Complex Silicon Phased Array Chip Developed atUC San Diego in UCSD News (reviewed 02. November 2007)

} ^ "AEGIS Weapon System MK-7". Jane's Information Group.2001-04-25. Archived from the original on 2006-07-01.Retrieved 2006-08-10..

} ^ Scott, Richard (April 2006). "Singapore Moves to Realise ItsFormidable Ambitions".Jane's Navy International111 (4): 4249.

} ^ Phased-Array Antenna for the MESSENGER Deep SpaceMission

} ^ National Oceanic and Atmospheric Administration. PARBackgrounder. Accessed April 6, 2006.

} ^ P. D. Trinh, S. Yegnanarayanan, F. Coppinger and B. JalaliSilicon-on-Insulator (SOI) Phased-Array WavelengthMulti/Demultiplexer with Extremely Low-Polarization SensitivityIEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 9, NO. 7, JULY1997

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QUESTIONS???