1 / 16

A Multioctave Broadband Vest Antenna Based on SMM Antenna Technology Johnson J. H. Wang and David J. Triplett* Wang Ele

A Multioctave Broadband Vest Antenna Based on SMM Antenna Technology Johnson J. H. Wang and David J. Triplett* Wang Electro-Opto Corporation Marietta, Georgia 30067 USA Presented in the 2006 IEEE AP-S International Antenna Symposium Albuquerque, NM July 12, 2006

jordana
Télécharger la présentation

A Multioctave Broadband Vest Antenna Based on SMM Antenna Technology Johnson J. H. Wang and David J. Triplett* Wang Ele

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A Multioctave Broadband Vest Antenna Based on SMM Antenna Technology Johnson J. H. Wang and David J. Triplett* Wang Electro-Opto Corporation Marietta, Georgia 30067 USA Presented in the 2006 IEEE AP-S International Antenna Symposium Albuquerque, NM July 12, 2006 This research is supported by US Army CERDEC, Ft. Monmouth, NJ. Wang Electro-Opto Corporation ( )

  2. Outline • Motivation • Approach • Brassboard Models • Measured Performance • Concluding Remarks Wang Electro-Opto Corporation ( )

  3. Motivation • Mobile soldiers, police, firefighters, forestry workers, etc. need “hands free” operation for their wireless equipment. • A solution is to use antennas borne or worn on their upper torso (as vest antenna). Wang Electro-Opto Corporation ( )

  4. Prior known vest antennas have severe shortcomings • No conductive shielding against radiation hazards to wearer • acceptable in research and test stage under the “controlled environment” exclusion clause • unacceptable for deployment since vest antennas are worn regularly, thus in an “uncontrolled environment” • Poor gain pattern • low gain • poor omnidirectional coverage • rapid oscillatory spatial variations Wang Electro-Opto Corporation ( )

  5. Safety issues on RF radiation hazard for vest antennas — serious yet overlooked • Vest antenna designs must be based on an “uncontrolled environment” scenario (like the cell phone), since they are worn continually, though by professionals. • At 300-3000 MHz, PEL (Permissible Exposure Limit) for uncontrolled environment is five timeslower than that for controlled environment. Wang Electro-Opto Corporation ( )

  6. Radiation hazard is a critical issue for body worn antennas • Most cell phones barely meet the 1.6 W/kg SAR (Specific Absorption Rate) limit, even at the typical 0.25 W power. • JTRS (Joint Tactical Radio System) mobile radios aim at 5 W power. Wang Electro-Opto Corporation ( )

  7. The present approach • Based on the SMM (spiral-mode microstrip) antenna technology • Ultrawideband (multioctave) • has inherent ground plane to shield the wearer from radiation hazard Wang Electro-Opto Corporation ( )

  8. Design goals Frequency of operation 0.225 – 1.0 GHz Polarization circular polarization Radiation pattern omnidirectional coverage with minimal spatial dips Safety requirements on RF radiation ANSI standard for “Uncontrolled Environment” Wang Electro-Opto Corporation ( )

  9. A 2-element vest array of SMM antennas Wang Electro-Opto Corporation ( )

  10. Military gear onto which vest antenna can be installed z x Wang Electro-Opto Corporation ( )

  11. Representative azimuth patterns on saline mannequin(pseudo-circular polarization) y VP 5dB/div x HP 0.225 GHz 0.5 GHz 1.0 GHz Wang Electro-Opto Corporation ( )

  12. Measured peak antenna gain in the azimuth plane Wang Electro-Opto Corporation ( )

  13. Measured SWR of front element antenna 2 1 Wang Electro-Opto Corporation ( )

  14. Key advantages of SMM vest antenna over whip Wang Electro-Opto Corporation ( )

  15. Major disadvantages of this vest antenna • Weight: • currently 4.4 lbs. • reducible to 1.5 lbs. • Disruption by other body borne gear Wang Electro-Opto Corporation ( )

  16. Concluding Remarks • A multioctave broadband vest antenna based on the SMM antenna technology has been developed. • The brassboard model exhibits considerably better performance than other known vest antennas. • It has major advantages over the whip antenna: much wider bandwidth, invisible, safer, and more stable connectivity. • It should be able to meet ANSI safety requirements on RF radiation hazard. • It has disadvantages of weight and disruption by other body-worn gear. Wang Electro-Opto Corporation ( )

More Related