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2006•2006 IEEE Antennas and Propagation Society International SymposiumRequires access

Stepped-Reflector Antenna for Dual-Band Satellite Communications Payloads

Sudhakar Rao, Minh Tang

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Abstract

This paper presents a novel "Stepped-Reflector Antenna" (SRA) suitable for multiple beam dual-band satellite communications. The SRA generates "flat-top" receive beams and highly efficient transmit beams over a geographic coverage region as seen by the satellite. It combines the reflector improvements through the use of stepped-regions with the feed horn advancements through the use of dual-band high efficiency horns (DBHEH) [1,2] in order to realize an efficient multiple beam antenna (MBA) system supporting both uplink and downlink frequencies simultaneously. It is shown that the SRA provides a congruent set of spot beams at both frequency bands with the benefits of significantly improved edge-of-coverage (EOC) gain, improved copolar isolation (C/I) among re-use beams, receive beam patterns that are less sensitive to pointing errors, and reduced number of reflector antennas when compared to conventional MBAs.

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What this paper is about

This paper presents a novel "Stepped-Reflector Antenna" (SRA) suitable for multiple beam dual-band satellite communications. The SRA generates "flat-top" receive beams and highly efficient transmit beams over a geographic coverage region as seen by the satellite. It combines the reflector improvements through the use of stepped-regions with the feed horn advancements through the use of dual-band high efficiency horns (DBHEH) [1,2] in order to realize an efficient multiple beam antenna (MBA) system supporting both uplink and downlink frequencies simultaneously. It is shown that the SRA provides a congruent set of spot beams at both frequency bands with the benefits of significantly improved edge-of-coverage (EOC) gain, improved copolar isolation (C/I) among re-use beams, receive beam patterns that are less sensitive to pointing errors, and reduced number of reflector antennas when compared to conventional MBAs.

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Available abstract

This paper presents a novel "Stepped-Reflector Antenna" (SRA) suitable for multiple beam dual-band satellite communications. The SRA generates "flat-top" receive beams and highly efficient transmit beams over a geographic coverage region as seen by the satellite. It combines the reflector improvements through the use of stepped-regions with the feed horn advancements through the use of dual-band high efficiency horns (DBHEH) [1,2] in order to realize an efficient multiple beam antenna (MBA) system supporting both uplink and downlink frequencies simultaneously. It is shown that the SRA provides a congruent set of spot beams at both frequency bands with the benefits of significantly improved edge-of-coverage (EOC) gain, improved copolar isolation (C/I) among re-use beams, receive beam patterns that are less sensitive to pointing errors, and reduced number of reflector antennas when compared to conventional MBAs.

Key concepts: Reflector (photography), Feed horn, Cassegrain antenna, Offset dish antenna, Telecommunications link, Periscope antenna, Communications satellite, Antenna (radio)

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