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Efficient HF Submarine Antennas

Presenters Frank Plonski of HI-Q-Antennas Charles M. Gyenes of HI-Q-Antennas JULY 10, 2008. Efficient HF Submarine Antennas. Overview. Background - Abstract/Problem/Solution Antenna - Design parameters/Description Performance - Data/Measured/Calculated/results. ABSTRACT.

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Efficient HF Submarine Antennas

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  1. Presenters Frank Plonski of HI-Q-Antennas Charles M. Gyenes of HI-Q-Antennas JULY 10, 2008 Efficient HF Submarine Antennas

  2. Overview Background - Abstract/Problem/Solution Antenna - Design parameters/Description Performance - Data/Measured/Calculated/results

  3. ABSTRACT For submarine applications, it is desirable to have broadband, efficient, extremely short HF antennas that can cover the whole band without the use of a complex internal/external tuning circuitry. A short monopole antenna is currently used except that it has the following disadvantages: it is not efficient and uses complex external tuning circuitry. An electrically efficient small packaged submarine antenna that operates at the HF band was developed using existing subminiature aperture technology. In this paper, we detail the HF submarine antenna technology and performance results focusing on existing efficient submarine HF communications antennas.

  4. PROBLEM Hard to achieve efficient HF performance in small restricted Radome cylindrical size Current HF submarine antennas are very inefficient radiators Complex antenna couplers decreases reliability and increases maintenance Heat exchangers removing non-radiated RF generated heat are undesirable

  5. SOLUTION(installed on HMS Gotland)‏ HI-Q-4/2-30 installed on HMS Gotland Submarine HF Communications Antenna HI-Q antenna has higher radiation efficiency then any other short HF submarine antenna designed to date HI-Q antenna has only one moving part No external complex antenna couplers

  6. Design Parameters PARAMETER HMS GOTLAND REQUIREMENT HI-Q ANTENNA DELIVERED Volume 92 X 4.0 inches 92 X 4.0 inches Frequency 2-30 MHz 2-30 MHz VSWR 1.5:1 Nominal 1.5:1 Nominal Power 500 watts 1500 watts Radiation Patterns Omni-directional in Azimuth Omni-directional in Azimuth Gain  @ 2.0 MHz -12dBi Minimum rising  to + 4.5 dBi @ 30 MHz  @ 2.0 MHz -12dBi Minimum rising  to + 4.5 dBi @ 30 MHz Impedance 50 ohm 50 ohm Polarization Vertical Vertical

  7. Antenna Description( Specific to the HMS GOTLAND)‏ HI-Q-4/2-30 is a broadband, ultra small HF aperture, 2-30 MHz tunable antenna Inductively tuned from 2-20 MHz Re-Entrant Coaxial Capacity Hat antenna, a very broadband monopole from 20- 30 MHz. Antenna consists of a lower mast, a tunable loading coil, a Re-Entrant Capacity Hat, and an antenna controller. Remotely tunable (5 sec) with +24vdc motor or a stepper motor

  8. DIMENSIONS AND MASS( Specific to the HMS GOTLAND)‏ Total height:                                       92 inches max (includes connectors)‏ Diameter:                                           4 inches max (includes screw-bolt heads)‏ Weight:                                              20 lbs (approx)

  9. HI-Q-Family of Submarine AntennasHI-Q-6-2/30 HI-Q-5-2/30 HI-Q-4-2/30 HMS GOTLAND

  10. HI-Q-4/2-30 Measured VSWR( Specific to the HMS GOTLAND)‏

  11. Computed Radiation Pattern and Gain

  12. HMS Gotland HF Antenna Installation

  13. Antenna Performance 2- way worldwide communications achieved using HI-Q-6/2-30MHz Virginia Class prototype Demonstrated high Radiation Efficiency by 2- way communications (5x9)‏ EXAMPLES: 1.850 MHz USA and Canada (2006-2007 winter),3.795 MHz  From near San Diego California to Hawaii, China, Japan, Australia, New Zealand, 3.798 MHz to South Africa, 7.250 MHz daily contacts within USA, Canada, Europe, 14-18.0- 21.0 MHz world wide with 100 watt RF SSB

  14. CONCLUSIONS In this paper we have reviewed some of our calculated and experimental results on design of electrically short HF antennas. The HI-Q antenna has higher radiation efficiency then any other short HF submarine antenna designed to date. High Reliability –one moving part Very COST Effective

  15. AcknowledgmentsNAVSEA-PHL contributing team members on the Hi-Q antenna integration into the HMS GOTLAND Submarine sub-safe mast Mr. James Stiles of NSWC-CD Philadelphia Mr. John Ledder of NSWC-CD Philadelphia Mr. John Dolan of NSWC-CD Philadelphia Mr. Jason Batcho of NSWC-CD Philadelphia Mr. Frank Plonski of NSWC-CD Philadelphia Mr. Allan Heong of GDIT- Philadelphia

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