Naval Command,
Control and Ocean
Surveillance Center
RDT&E Division,
San Diego, CA 92152-5001

Navy Seal

JTIDS ANTENNA

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The Joint Tactical Information Distribution System (JTIDS) AS-4400/URC antenna is a two-element colinear array developed by NRaD's Microwave/Millimeter Wave Branch. The antenna is used as a shipboard JTIDS receive-only antenna or a shipboard JTIDS transmit/receive antenna, where JTIDS systems requirements must be met without supporting the Tactical Air Navigation (TACAN) antenna. It can also be used as a transmit/receive antenna for the UPX-28 IFF transponder unit

Planes

JTIDS Antenna Operating Environment

JTIDS provides a secure, jam-resistant digital communications link for data and voice, supporting command and control, navigation, relative positioning, and identification. JTIDS is a time-division multiple-access (TDMA) system that operates over line-of-sight ranges up to 300 nautical miles, with automatic relay extension beyond. Within the JTIDS mission profile, the JTIDS shipboard antenna enables tactical communications between properly equipped ships (designated CVs, CGs, and DDGs) and aircraft (E-2C and F-14D) assigned to the battle group.

The antenna is a flange- or pipe-mounted antenna installed on various shipboard mast locations. As part of the JTIDS URC-107(V) transceiver system, it provides receive-only antenna reception and emergency transmit. The antenna enables reception of JTIDS RF signals with omnidirectional azimuth coverage and tapered hemispherical elevation coverage. It can be mounted on a flange mount or, using a standard adapter, mounted at the end of a vertical 1.5-inch-diameter pipe. The antenna is 17.74 inches long, consisting of a colinear array of two dipoles protected by a fiberglass-tubing radome.

Figure 2

Cutaway View of the JTIDS  Antenna

Without electrical or mechanical tuning, the antenna operates as an omnidirectional antenna over the entire JTIDS frequency band (960 MHz to 1215 MHz). It also meets the military requirements (MIL-STD-2036) for shipboard environmental conditions.

Figure 3

JTIDS  Antenna with Reflector and IFF Filter

OPTIONS AVAILABLE

  • Pipe mount (1.5 inch)
  • Flange mount (standard 2-inch pipe flange)
  • Reflector for 180-degree azimuth coverage and increased gain
  • Local low-noise amplifier
  • Attached 1030-MHz/1090-MHz double-bandpass filter (for IFF applications featuring interference protection)
  • Duplexer for Tx and amplified Rx.

    • Elevation Pattern of the JTIDS Antenna at 1088 MHz
    (Mounted on its side in the Anechoic Chamber)

    Figure 4

    Operational information

    Azimuth Pattern of the JTIDS  Antenna
    at 1088 MHz in the Anechoic Chamber

    Figure 5



    Figure 6

    JTIDS  Antenna Pipe-Adapter Mounting Option

    Further Information

    For further information on NRaD'sw JTIDS stand-alone antenna, please contact the

    NCCOSC RDT&E Division (NRaD)
    53215 Millimeter Street
    San Diego, CA 92152-7310<

    NRAD LOGO
    Reviewed and approved by

    Executive Officer
    NCCOSC RDT&E Division

    SD 004
    May 1996

    This technology may be covered by an invention disclosure assignable to the U.S. Government. Parties interested in licensing this technology may direct inquiries to:

    Approved for public release; distribution is unlimited.

    A Product of the Technical Information Division (TID)