OE-578 Gain vs. Frequency

OE-578 Horizontal Beamwidth vs. Frequency

Broadband Shipboard AntennasOE-578/USQ

SPAWARSystems Center

San Diego

This technology may be covered by an invention disclosureassignable to the U.S. Government. Parties interested inlicensing this technology may direct inquiries to:

Michael Kagan, Legal Counsel for Patents, Code 20012SSC San DiegoSan Diego, CA 92152-5001(619) 553-3001

Approved for public release; distribution is unlimited.

Further InformationFor further information on SSC San Diego antennas, please contact:SSC San DiegoAntennas and RF Technology Branch Code 273849336 Digital RoadSan Diego, CA 92152–7621Voice: (619) 553–2584 or 2205FAX: (619) 553–2580email: hale.simonds@navy.mil

Reviewed and approved by

F. D. Unetic, CAPT, USNCommanding OfficerSSC San DiegoSan Diego, CA 92152-5001

SD 590April 2006

Standard Shipboard Configuration

OE-578 Vertical Beamwidth vs. Frequency

12

14

10

8

4

0

2

6

0 400 800 1200 1600 2000

FREQUENCY (MHz)

AS-179 AS-180

GAIN

(dBi)

2400 2800 3200 3600 4000

120

100

80

40

0

20

60

100 500 900 1300 1700 2100

FREQUENCY (MHz)

AS-179 AS-180

HORI

ZONT

AL B

EAMW

IDTH

(deg

rees

)

2500 2900 3300 3700 4100

140

120

100

80

40

0

20

60

100 500 900 1300 1700 2100

FREQUENCY (MHz)

AS-179 AS-180

VERT

ICAL B

EAMW

IDTH

(deg

rees

)

2500 2900 3300 3700 4100

he OE-578/USQ consists of two broad-band, directional, shipboard antennas, a

dielectric mast, a positioner, and a positionercontroller. This antenna system was designedand developed by SPAWAR Systems CenterSan Diego (SSC San Diego), Antennas andRF Technology Branch, Code 2738. Currentlythe OE-578 antenna system provides transmitand receive capability for systems used onU.S. Navy ships. This antenna system wasdesigned to meet the DDG 51 requirementsto support a wideband shipboard operationsystem, including radar cross-section (RCS).The OE-578 includes two lightweight, high-gain, directional antennas: the AS-179/USQLog Periodic Dipole Array (LPDA) and theAS-180/USQ Tapered Slot Antenna (TSA);both have transmit and receive capability.The LPDA is manufactured out of 316 stain-less steel and is powder-coated to meet ship-board environmental conditions. It is made upof 27 element pairs and provides a typicalgain of 8.0 dBi. The TSA is a 12” x 12”foam encapsulated, rugged, tapered slotantenna that provides a typical gain of 9.8dBi. Both antennas have a peak of beamcentered at the horizon. The positioner is aProsistel PST-61D-MIL and is used for rotatingthe antennas. These antennas and positionerhave been environmentally tested and meetall shipboard environmental requirements,including shock and vibration. Both theAS-179 and AS-180 can be used as stand-alone antennas and are applicable to othership classes.

AS-179/USQElectrical Specificationsl Operating Frequency Band:

VHF and UHF bandl Typical Gain: 8.0 dBi l Connector Input: Type ‘N’ femalel Typical AZ and EL 3-dB beamwidth,

respectively: 65° and 45°l Polarization: Verticall VSWR: 3.0:1 maximuml Transmit Power: 1000 watts avg.l Tested and meets RCS specifications for the

DDG 51 class ship

Mechanical Specificationsl Environmentally tested and meets ship-

board MIL-HDBK-2036 requirementsl Operating Temperature: –32°C to +63°C l Weight: 23.7 lbl Dimensions: 60”h x 92.2”w x 4.9”dl Mounting Flange: Standard with 2” pipe

mount U-bolts l 316 stainless-steel construction and

powder-coated

AS-180/USQElectrical Specificationsl Operating Frequency Band:

UHF bandl Typical Gain: 9.8 dBil Connector Input: Type ‘N’ femalel Typical AZ and EL 3-dB beamwidth,

respectively: 61° and 41°l Polarization: Verticall VSWR: 2.0:1 maximuml Transmit Power: 1000 watts avg.l Tested and meets RCS specifications for the

DDG 51 class ship

Mechanical Specificationsl Environmentally tested and meets ship-

board MIL-HDBK-2036 requirementsl Operating Temperature: –32°C to +63°Cl Weight: 7.9 lbl Dimensions: 13.7”h x 14.2”w x 2.1”dl Mounting Flange: Standard with 2” pipe

mount U-bolts or flange mounting on boltpattern

T

AS-180/USQ Tapered Slot Antenna (TSA)AS-179/USQ Log Periodic Dipole Array (LPDA)

Prosistel PST-61D-MIL Positioner