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

Rev : 01 | Rev date : 25 Mar 2021

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 G-Pattern family of antennas provides customizable solutions in a low wind load format. 
The SAA G-pattern feature stable beam-tilt with null-free elevation pattern.
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 G Series RFStar antennas feature stable beam-tilt with null-free elevation pattern
  • 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  Null-Free Pattern

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  

SAA12G-

O4

SAA18G-

O4

SAA20G-

O4

SAA24G-

O4

SAA28G-

O4

SAA30G-

O4

SAA32G-

O4
Azimuth Pattern Type   Omni-directional
Azimuth Pattern Directivity Numerical 1.0
Elevation Pattern Type   Null Free (type G)
Number of Bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 11.7 17.3 19.1 23.4 26.3 29.4 30.0
Peak Gain Numerical 11.7 17.3 19.1 23.4 26.3 29.4 30.0
Peak Gain dBd 10.7 12.4 12.8 13.7 14.2 14.7 14.8

DATA FOR ANTENNAS WITH ATW-P PATTERN  
Antenna Model    SAA12G-ATW_P SAA18G-ATW_P SAA20G-ATW_P SAA24G-ATW_P SAA28G-ATW_P SAA30G-ATW_P SAA32G-ATW_P
Azimuth Pattern Type   Peanut ATW-P
Azimuth Pattern Directivity Numerical 1.7
Elevation Pattern Type   Null Free (type G)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 11.7 17.3 19.1 23.4 26.3 29.4 30.0
Peak Gain Numerical 19.9 29.4 32.5 39.8 44.7 50.0 51.0
Peak Gain dBd 13.0 14.7 15.1 16.0 16.5 17.0 17.1
DATA FOR ANTENNAS WITH ATW-P1 PATTERN  
Antenna Model    SAA12G-ATW_P1 SAA18G-ATW_P1 SAA20G-ATW_P1 SAA24G-ATW_P1 SAA28G-ATW_P1 SAA30G-ATW_P1 SAA32G-ATW_P1
Azimuth Pattern Type   Peanut ATW-P1
Azimuth Pattern Directivity Numerical 1.9
Elevation Pattern Type   Null Free (type G)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 11.7 17.3 19.1 23.4 26.3 29.4 30.0
Peak Gain Numerical 22.2 32.9 36.3 44.5 50.0 55.9 57.0
Peak Gain dBd 13.5 15.2 15.6 16.5 17.0 17.5 17.6

DATA FOR ANTENNAS WITH ATW-P3 PATTERN  
Antenna Model    SAA12G-ATW_P3 SAA18G-ATW_P3 SAA20G-ATW_P3 SAA24G-ATW_P3 SAA28G-ATW_P3 SAA30G-ATW_P3 SAA32G-ATW_P3
Azimuth Pattern Type   Peanut ATW-P3
Azimuth Pattern Directivity Numerical 2.2
Elevation Pattern Type   Null Free (type G)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 11.7 17.3 19.1 23.4 26.3 29.4 30.0
Peak Gain Numerical 25.7 38.1 42.0 51.5 57.9 64.7 66.0
Peak Gain dBd 14.1 15.8 16.2 17.1 17.6 18.1 18.2
DATA FOR ANTENNAS WITH P230 PATTERN  
Antenna Model   

SAA12G-

P230

SAA18G-

P230

SAA20G-

P230

SAA24G-

P230

SAA28G-

P230

SAA30G-

P230

SAA32G-

P230
Azimuth Pattern Type   Peanut P230
Azimuth Pattern Directivity Numerical 2.3
Elevation Pattern Type   Null Free (type G)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 11.7 17.3 19.1 23.4 26.3 29.4 30.0
Peak Gain Numerical 26.9 39.8 43.9 53.8 60.5 67.6 69.0
Peak Gain dBd 14.3 16.0 16.4 17.3 17.8 18.3 18.4

DATA FOR ANTENNAS WITH T160 PATTERN  
Antenna Model   

SAA12G-

T160

SAA18G-

T160

SAA20G-

T160

SAA24G-

T160

SAA28G-

T160

SAA30G-

T160

SAA32G-

T160
Azimuth Pattern Type   Trilobe T160
Azimuth Pattern Directivity Numerical 1.6
Elevation Pattern Type   Null Free (type G)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 11.7 17.3 19.1 23.4 26.3 29.4 30.0
Peak Gain Numerical 18.7 27.7 30.6 37.4 42.1 47.0 48.0
Peak Gain dBd 12.7 14.4 14.9 15.7 16.2 16.7 16.8
DATA FOR ANTENNAS WITH T180 PATTERN  
Antenna Model   

SAA12G-

T180

SAA18G-

T180

SAA20G-

T180

SAA24G-

T180

SAA28G-

T180

SAA30G-

T180

SAA32G-

T180
Azimuth Pattern Type   Trilobe T180
Azimuth Pattern Directivity Numerical 1.8
Elevation Pattern Type   Null Free (type G)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 11.7 17.3 19.1 23.4 26.3 29.4 30.0
Peak Gain Numerical 21.1 31.1 34.4 42.1 47.3 52.9 54.0
Peak Gain dBd 13.2 14.9 15.4 16.2 16.8 17.2 17.3

DATA FOR ANTENNAS WITH ATW-T1 PATTERN  
Antenna Model    SAA12G-ATW_T1 SAA18G-ATW_T1 SAA20G-ATW_T1 SAA24G-ATW_T1 SAA28G-ATW_T1 SAA30G-ATW_T1 SAA32G-ATW_T1
Azimuth Pattern Type   Trilobe ATW-T1
Azimuth Pattern Directivity Numerical 1.8
Elevation Pattern Type   Null Free (type G)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 11.7 17.3 19.1 23.4 26.3 29.4 30.0
Peak Gain Numerical 21.1 31.1 34.4 42.1 47.3 52.9 54.0
Peak Gain dBd 13.2 14.9 15.4 16.2 16.8 17.2 17.3

DATA FOR ANTENNAS WITH ATW-T2 PATTERN

  
Antenna Model    SAA12G-ATW_T2 SAA18G-ATW_T2 SAA20G-ATW_T2 SAA24G-ATW_T2 SAA28G-ATW_T2 SAA30G-ATW_T2 SAA32G-ATW_T2
Azimuth Pattern Type   Trilobe ATW-T2
Azimuth Pattern Directivity Numerical 2.2
Elevation Pattern Type   Null Free (type G)
Number of bays [note 1] 12 18 20 24 28 30 32
Elevation RMS Gain Numerical 11.7 17.3 19.1 23.4 26.3 29.4 30.0
Peak Gain Numerical 25.7 38.1 42.0 51.5 57.9 64.7 66.0
Peak Gain dBd 14.1 15.8 16.2 17.1 17.6 18.1 18.2

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