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SAA Top Mount Smooth Null-Fill
RFStar™ UHF High Power Top Mount Slot Antennas with Enhanced Elevation Pattern. Low Wind-load, Horizontal, Elliptical or Circular Polarization

PRODUCT DESCRIPTION

The RFStar™  UHF slotted array antennas provide a simple and reliable option for single or dual channel fixed polarization applications. They are fully enclosed in a radome for high performance and reliability. They are available in horizontal, elliptical and circular polarizations. 
The SAA Top-Mount J-Pattern family of antennas provides customizable solutions in a low wind load format. 
The SAA J-pattern features stable beam-tilt and smooth null-fill.
Azimuth radiation patterns are customized to the exact customer requirements. A selection of some of the most common Azimuth radiation patterns are shown in these product datasheets. For additional options contact RFS or consult the RFS Antenna Selection and Planning Tool. To download, click here

FEATURES / BENEFITS

  • Very smooth null-fill. The J Series RFStar antennas feature stable beam-tilt with smooth null-fill
  • High power rating
  • Low wind load
  • Horizontal, Elliptical and Circular polarizations available
  • Wide range of azimuth and elevation patterns and null fill options
  • Single-channel or Dual channel options available for adjacent channel allocations
  • Rugged design with enclosed radome for high performance and reliability
  • Manufactured in the USA – local staff ready to support your deployments

TECHNICAL FEATURES

Details 

Product Type   High Power Top Mount Slot Antenna with  Smooth Null-Fill

Electrical Specifications 

Antenna Type   Slot Antenna
Operating Frequency Range MHz 470-698
Number of Channels   Single channel (Dual option)
Polarization   Horizontal, Elliptical, Circular
Azimuth Radiation Pattern   Omni, Peanut or Trilobe
VSWR   <1.08:1 (typically <1.04:1)
Impedance Ohms 50 (for 4-1/16" and 6-1/8" Inputs)
75 (for 6-1/8", 7-3/16" and 8-3/16" Inputs)
Input Power Max. kW Up to 90 (depends on the number of bays and input connector size) – 
Contact RFS or consult the RFS Antenna Analysis and Selection Tool
Input Connector Sizes  

8-3/16", 7-3/16", 6-1/8" or 4-1/16"

Beam Tilt

degrees
[Note 5]

0-1.5

Mechanical Specifications 

Mounting   Top Mounting
Radome Diameter mm (in)
[note 2]
538 (21.2)
Pressurization Operational kPa (psi) 10 to 25 (1.4-3.6)
Pressurization Test kPa (psi) 100 (15)

Material

Material - Radome   UV Resistant Polycarbonate
Material - Insulators   Virgin PTFE
Material - Support Pole / Mounting   Hot Dipped Galvanized Steel
Material - Feedline   Copper
Color   Aviation Orange or White radome (other colors available on request)

DATA FOR ANTENNAS WITH O4 PATTERN

 
Antenna Model  

SAA12J-

O4

SAA18J-

O4

SAA20J-

O4

SAA24J-

O4

SAA28J-

O4

SAA30J-

O4

SAA32J-

O4

Azimuth Pattern Type   Omni-directional
Azimuth Pattern Directivity Numerical 1.0
Elevation Pattern Type   Smooth (type J)
Number of Bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical

12.6

19.1 21.3 25.3 28.8 30.4 32.6
Peak Gain Numerical 12.6 19.1 21.3 25.3 28.8 30.4 32.6
Peak Gain dBd 11.0 12.8 13.3 14.0 14.6 14.8 15.1

DATA FOR ANTENNAS WITH ATW-P PATTERN  
Antenna Model    SAA12J-ATW_P SAA18J-ATW_P SAA20J-ATW_P SAA24J-ATW_P SAA28J-ATW_P SAA30J-ATW_P SAA32J-ATW_P
Azimuth Pattern Type   Peanut ATW-P
Azimuth Pattern Directivity Numerical 1.7
Elevation Pattern Type   Smooth (type J)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 12.6 19.1 21.3 25.3 28.8 30.4 32.6
Peak Gain Numerical 21.4 32.5 36.2 43.0 49.0 51.7 55.4
Peak Gain dBd 13.3 15.1 15.6 16.3 16.9 17.1 17.4
DATA FOR ANTENNAS WITH ATW-P1 PATTERN  
Antenna Model    SAA12J-ATW_P1 SAA18J-ATW_P1 SAA20J-ATW_P1 SAA24J-ATW_P1 SAA28J-ATW_P1 SAA30J-ATW_P1 SAA32J-ATW_P1
Azimuth Pattern Type   Peanut ATW-P1
Azimuth Pattern Directivity Numerical 1.9
Elevation Pattern Type   Smooth (type J)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 12.6 19.1 21.3 25.3 28.8 30.4 32.6
Peak Gain Numerical 23.9 36.3 40.5 48.1 54.7 57.8 61.9
Peak Gain dBd 13.8 15.6 16.1 16.8 17.4 17.6 17.9

DATA FOR ANTENNAS WITH ATW-P3 PATTERN  
Antenna Model    SAA12J-ATW_P3 SAA18J-ATW_P3 SAA20J-ATW_P3 SAA24J-ATW_P3 SAA28J-ATW_P3 SAA30J-ATW_P3 SAA32J-ATW_P3
Azimuth Pattern Type   Peanut ATW-P3
Azimuth Pattern Directivity Numerical 2.2
Elevation Pattern Type   Smooth (type J)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 12.6 19.1 21.3 25.3 28.8 30.4 32.6
Peak Gain Numerical 27.7 42.0 46.9 55.7 63.4 66.9 71.7
Peak Gain dBd 14.4 16.2 16.7 17.5 18.0 18.3 18.6
DATA FOR ANTENNAS WITH P230 PATTERN  
Antenna Model   

SAA12J-

P230

SAA18J-

P230

SAA20J-

P230

SAA24J-

P230

SAA28J-

P230

SAA30J-

P230

SAA32J-

P230

Azimuth Pattern Type   Peanut P230
Azimuth Pattern Directivity Numerical 2.3
Elevation Pattern Type   Smooth (type J)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 12.6 19.1 21.3 25.3 28.8 30.4 32.6
Peak Gain Numerical 29.0 43.9 49.0 58.2 66.2 69.9 75.0
Peak Gain dBd 14.6 16.4 16.9 17.6 18.2 18.4 18.7

DATA FOR ANTENNAS WITH T160 PATTERN  
Antenna Model   

SAA12J-

T160

SAA18J-

T160

SAA20J-

T160

SAA24J-

T160

SAA28J-

T160

SAA30J-

T160

SAA32J-

T160

Azimuth Pattern Type   Trilobe T160
Azimuth Pattern Directivity Numerical 1.6
Elevation Pattern Type   Smooth (type J)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 12.6 19.1 21.3 25.3 28.8 30.4 32.6
Peak Gain Numerical 20.2 30.6 34.1 40.5 46.1 48.6 52.2
Peak Gain dBd 13.0 14.9 15.3 16.1 16.6 16.9 17.2
DATA FOR ANTENNAS WITH T180 PATTERN  
Antenna Model   

SAA12J-

T180

SAA18J-

T180

SAA20J-

T180

SAA24J-

T180

SAA28J-

T180

SAA30J-

T180

SAA32J-

T180

Azimuth Pattern Type   Trilobe T180
Azimuth Pattern Directivity Numerical 1.8
Elevation Pattern Type   Smooth (type J)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 12.6 19.1 21.3 25.3 28.8 30.4 32.6
Peak Gain Numerical 22.7 34.4 38.3 45.5 51.8 54.7 58.7
Peak Gain dBd 13.6 15.4 15.8 16.6 17.1 17.4 17.7

DATA FOR ANTENNAS WITH ATW-T1 PATTERN  
Antenna Model    SAA12J-ATW_T1 SAA18J-ATW_T1 SAA20J-ATW_T1 SAA24J-ATW_T1 SAA28J-ATW_T1 SAA30J-ATW_T1 SAA32J-ATW_T1
Azimuth Pattern Type   Trilobe ATW-T1
Azimuth Pattern Directivity Numerical 1.8
Elevation Pattern Type   Smooth (type J)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 12.6 19.1 21.3 25.3 28.8 30.4 32.6
Peak Gain Numerical 22.7 34.4 38.3 45.5 51.8 54.7 58.7
Peak Gain dBd 13.6 15.4 15.8 16.6 17.1 17.4 17.7

DATA FOR ANTENNAS WITH ATW-T2 PATTERN

 
Antenna Model    SAA12J-ATW_T2 SAA18J-ATW_T2 SAA20J-ATW_T2 SAA24J-ATW_T2 SAA28J-ATW_T2 SAA30J-ATW_T2 SAA32J-ATW_T2
Azimuth Pattern Type   Trilobe ATW-T2
Azimuth Pattern Directivity Numerical 2.2
Elevation Pattern Type   Smooth (type J)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 12.6 19.1 21.3 25.3 28.8 30.4 32.6
Peak Gain Numerical 27.7 42.0 46.9 55.7 63.4 66.9 71.7
Peak Gain dBd 14.4 16.2 16.7 17.5 18.0 18.3 18.6

Model Dimensions - Top Mounted

 
Antenna Model   SAA12 SAA18 SAA20 SAA24 SAA28 SAA30 SAA32
Height m (ft) [note2 & 3] 8.1 (26.6) 11.4 (37.6) 12.6 (41.2) 14.8 (48.5) 17.0 (55.8) 18.1 (59.5) 19.2 (63.1)
COR from base of antenna m (ft) [note2] 4.1 (13.3) 5.7 (18.8) 6.3 (20.6) 7.4 (24.3) 8.5 (27.9) 9.1 (29.7) 9.6 (31.6)
Weight kg (lb) [note2] 1388 (3060) 1913 (4216) 2105 (4639) 2853 (6289) 4052 (8930) 4307 (9492) 5127 (11299)
Effective Area CaAc (no ice)

m sq. (ft sq.) [note4]

2.6 (27.9) 3.6 (39.2) 4.0 (43.4) 4.7 (50.9) 5.4 (58.5) 5.8 (62.3) 6.1 (66.1)

External Document Links

Antenna Selection Tool: Download

Notes

Note 1: Other numbers of bays available on request. Contact RFS or consult the RFS Antenna Analysis and Selection Tool

Note 2: For channel 25 and standard wind conditions. Refer to AAST tool for specific channel data.  Contact RFS if the location is in a high wind area

Note 3: Does Not Include Lightning Arrestor

Note 4: Design Parameters in accordance with TIA-222-G are:

  • 160 kmh (100 mph) Basic Wind Speed with no ice
  • Structure Class II
  • Topographic category 1, Exposure category C
  • Interface steelwork to tower not included in calculations.

Note 5: Other Beam-tilts available on request