Waveguide Terminations & Dummy Loads

Low, Medium and High Power Terminations

ATM manufactures a tremendous selection of Short, Low, Medium, and High Power Terminations for Rectangular Waveguides that do not require Forced Air Cooling.  Double Ridge Waveguide Terminations are also available.

We offer a complete line of waveguide terminations in all waveguide sizes and power levels.

Please call us and discuss your needs with one of our design engineers.

 

Rectangular Waveguide Termination - Low Power Small Size - 710 Series
Waveguide Terminations - 710 Series

Waveguide Terminations - 710 Series
Waveguide Terminations - 710 Series Diagram

Waveguide Terminations - 710 Series Diagram

 • Full waveguide frequency range.
 • Units pressure tested to 10 PSI.  Higher pressure is available upon request.
 • Finish is a unique corrosion-resistant 316 stainless steel epoxy coating.
 • VSWR: 1.2 max.
 • Series 710 Terminations use Medium Power Elements to achieve low VSWR and stable electrical characteristics.
WG Size Freq. (GHz) Avg. Power
(Watts)		 Peak
Power
(KW)		 Standard
Model No.*		 Dim A.
(Inches)
WR650 1.12-1.70 50 400 650-710A-2 7.00
WR430 1.70-2.60 40 400 430-710A-2 7.00
WR340 2.20-3.30 40 400 340-710A-2 6.00
WR284 2.60-3.95 30 400 284-710A-6 3.00
WR229 3.30-4.90 25 400 229-710B-2 3.00
WR187 3.95-5.85 25 350 187-710A-6 2.50
WR159 4.90-7.05 20 300 159-710B-2 2.00
WR137 5.85-8.20 15 200 137-710B-2 1.75
WR112 7.05-10.0 15 200 112-710B-6 1.50
WR102 7.00-11.0 15 150 102-710A-6 1.50
WR90 8.20-12.4 15 110 90-710A-6 1.50
WR75 10.0-15.0 15 100 75-710B-6 1.25
WR62 12.40-18.0 10 100 62-710B-6 1.00
WR51 15.0-22.0 10 60 51-710B-6 1.00
WR42 18.0-26.5 10 60 42-710B-6 1.00
WR34 22.0-33.0 5 40 34-710B-6 0.75
WR28 26.5-40.0 5 25 28-710B-6 0.75
WR22 33.0-50.0 5 10 22-710B-6 0.75

Ordering Information
Waveguide Terminations
Low Power, Small Size

 WR -Mod M -F
Example part number:  42 -710 B -6
Waveguide Size: (WR)
WR22 thru WR650 available		      
Basic Model No.: (-Mod)    
Material (M): A=Aluminum, B=Brass  
Flange (-F): 1=CPRG, 2=CPRF, 6=Cover, 7=Choke
See ATM Standard Flange page for more info.		  

* The Standard Model Numbers above are the most common parts ordered for size, material and flange. However, these models can easily be altered for your needs by using the Model # code system at left.

Note: All 745 series Terminations are aluminum construction only.

 

Rectangular Waveguide Termination - Low Power - 720 Series
Low Power Waveguide Terminations - Series 720

Low Power Waveguide Terminations - Series 720
Low Power Waveguide Termination - Series 720 Diagram

Low Power Waveguide Termination - Series 720 Diagram

 • Full waveguide frequency range.
 • Units pressure tested to 10 PSI.  Higher pressure is available upon request.
 • Finish is a unique corrosion-resistant 316 stainless steel epoxy coating.
 • Low outgassing characteristics.
 • VSWR: See table below.
 • ATM Series 720 Terminations use a precision conical element to achieve very low VSWR.
WG Size Freq. (GHz) VSWR
max.		 Avg. Power
(Watts)		 Peak Power
(kW)		 Standard
Model No.*		 Dim A.
(Inches)		 Outline
Dwgs
WR650 1.12-1.70 1.02 25 25 650-720A-2 12.50 Dwg
WR510 1.45-2.20 1.02 25 25 510-720A-2 12.50 Dwg
WR430 1.70-2.60 1.02 15 15 430-720A-2 11.00 Dwg
WR340 2.20-3.30 1.01 12 12 340-720A-2 10.75 Dwg
WR284 2.60-3.95 1.01 10 10 284-720A-6 10.75 Dwg
WR229 3.30-4.90 1.01 10 10 229-720B-2 7.50 Dwg
WR187 3.95-5.85 1.01 8 8 187-720A-6 6.25 Dwg
WR159 4.90-7.05 1.01 7 7 159-720B-2 6.00 Dwg
WR137 5.85-8.20 1.01 6 6 137-720B-2 5.50 Dwg
WR112 7.05-10.0 1.01 4 4 112-720B-6 5.00 Dwg
WR102 7.00-11.0 1.01 3 3 102-720A-6 5.25 Dwg
WR90 8.2-12.4 1.01 4 7 90-720A-6 4.00 Dwg
WR75 10.0-15.0 1.01 2 2 75-720B-6 4.00 Dwg
WR62 12.4-18.0 1.01 1.5 1.5 62-720B-6 4.00 Dwg
WR51 15.0-22.0 1.01 1.0 1.0 51-720B-6 4.00 Dwg
WR42 18.0-26.5 1.01 0.5 0.5 42-720B-6 2.50 Dwg
WR34 22.0-33.0 1.01 0.5 0.5 34-720B-6 2.50 Dwg
WR28 26.5-40.0 1.02 0.5 0.5 28-720B-6 2.00 Dwg
WR22 33.0-50.0 1.02 0.5 0.5 22-720B-6 1.75 Dwg

Ordering Information
Waveguide Terminations
Low Power, 720 Series

 WR -Mod M -F
Example part number:  42 -720 B -6
Waveguide Size: (WR)
WR22 thru WR650 available		      
Basic Model No.: (-Mod)    
Material (M): A=Aluminum, B=Brass  
Flange (-F): 1=CPRG, 2=CPRF, 6=Cover, 7=Choke
See ATM Standard Flange page for more info.		  

* The Standard Model Numbers above are the most common parts ordered for size, material and flange. However, these models can easily be altered for your needs by using the Model # code system at left.

 

Rectangular Waveguide Termination - Medium Power - 740 Series
Medium Power Waveguide Terminations - Series 740

Medium Power Waveguide Terminations - Series 740
Medium Power Waveguide Termination - Series 740 Diagram

Medium Power Waveguide Termination - Series 740 Diagram
  • Full waveguide frequency range.
  • Units pressure tested to 10 PSI.  Higher pressure is available upon request.
  • Finish: Hi-Temp black paint.
  • Low outgassing characteristics.
  • Series 740 Terminations utilizes High Power Ceramic Elements fired at 1300 C to achieve low VSWR and stable electrical characteristics.  See VSWR ratings on table below.
  • Units are best mounted in the horizontal plane with free air flow. The load temperature will vary depending on power levels and duration. If during use the surface temperature approaches 260°C at the hottest point, (normally where the first fin touches the waveguide body), forced air cooling should be used to prevent damage to the internal load element. Units can survive temperatures as high as 450 °C without damage for a short time.
WG Size Freq. (GHz) VSWR
Max.		 Avg. Power
(Watts)		 Peak Power
(kW)		 Standard
Model No.*		 Dim. A
(Inches)		 Outline
Dwgs
WR650 1.12-1.70 1.15 1500 800 650-740A-2 13.00 Dwg
WR430 1.70-2.60 1.15 1200 800 430-740A-2 12.00 Dwg
WR340 2.20-3.30 1.15 1200 800 340-740A-2 12.00 Dwg
WR284 2.60-3.95 1.10 1200 800 284-740A-6 11.00 Dwg
WR229 3.30-4.90 1.10 1000 800 229-740B-2 9.75 Dwg
WR187 3.95-5.85 1.10 750 750 187-740A-6 8.38 Dwg
WR159 4.90-7.05 1.10 625 625 159-740B-2 8.00 Dwg
WR137 5.85-8.20 1.10 500 400 137-740B-2 8.00 Dwg
WR112 7.05-10.0 1.10 425 400 112-740B-6 7.00 Dwg
WR102 7.00-11.0 1.10 325 300 102-740A-6 6.50 Dwg
WR90 8.2-12.4 1.10 225 225 90-740A-6 5.50 Dwg
WR75 10.0-15.0 1.10 200 200 75-740B-6 4.50 Dwg
WR62 12.4-18.0 1.10 100 200 62-740B-6 3.25 Dwg
WR51 15.0-22.0 1.10 100 120 51-740A-6 3.25 Dwg
WR42 18.0-26.5 1.15 100 120 42-740B-6 3.50 Dwg
WR34 22.0-33.0 1.15 75 80 34-740B-6 3.25 Dwg
WR28 26.5-40.0 1.15 75 50 28-740B-6 4.00 Dwg
WR22 33.0-50.0 1.15 25 20 22-740B-6 2.50 Dwg

Ordering Information
Waveguide Terminations
Medium Power, Series 740

 WR -Mod M -F
Example part number:  51 -740 A -6
Waveguide Size: (WR)
WR22 thru WR650 available		      
Basic Model No.: (-Mod)    
Material (M): A=Aluminum, B=Brass  
Flange (-F): 1=CPRG, 2=CPRF, 6=Cover, 7=Choke
See ATM Standard Flange page for more info.		  

* The Standard Model Numbers above are the most common parts ordered for size, material and flange. However, these models can easily be altered for your needs by using the Model # code system at left.

 

Rectangular Waveguide Termination - High Power - 745 Series
High Power Rectangular Waveguide Termination - Series 745

High Power Rectangular Waveguide Termination - Series 745
High Power Waveguide Terminations - Series 745 Diagram

High Power Waveguide Terminations - Series 745 Diagram
  • Full waveguide frequency range.
  • Units pressure tested to 10 PSI.  Higher pressure is available upon request.
  • Low outgassing characteristics.
  • VSWR: see rating on table below.
  • ATM Series 745 Terminations utilizes High Power Ceramic Elements fired at 1300 C for low VSWR and stable electrical characteristics.
  • All series 745 Terminations are manufactured from 6061 Aluminum.
  • Finish: Hi-Temp black paint.
  • Units are best mounted in the horizontal plane with free air flow. The load temperature will vary depending on power levels and duration. If during use the surface temperature approaches 260°C at the hottest point, (normally where the first fin touches the waveguide body), forced air cooling should be used to prevent damage to the internal load element. Units can survive temperatures as high as 450 °C without damage for a short time.
WG Size Freq. (GHz) VSWR
Max.		 Avg. Power
 (Watts)		 peak Power
(kW)		 Standard
Model No.*		 Dim. A
(Inches)		 Dim. B
(Inches)		 Dim. C
(Inches)		 Outline
WR650 1.12-1.70 1.15 2500 800 650-745-2 14.00 11.00 9.00  
WR430 1.70-2.60 1.15 2500 800 430-745-2 12.00 6.00 6.00  
WR340 2.20-3.30 1.15 2500 800 340-745-2 12.00 6.00 6.00  
WR284 2.60-3.95 1.10 2400 800 284-745-6 12.00 6.00 5.00  
WR229 3.30-4.90 1.10 2000 800 229-745-2 10.63 5.00 5.00  
WR187 3.95-5.85 1.10 1500 750 187-745-6 9.00 4.50 4.50  
WR159 4.90-7.05 1.10 1300 625 159-745-2 9.00 4.50 4.50  
WR137 5.85-8.20 1.10 1000 400 137-745-2 8.50 4.00 4.00  
WR137 5.85-8.20 1.10 1500 400 137-745A-2 9.00 4.50 4.50  .pdf
WR112 7.05-10.0 1.10 850 400 112-745-6 8.00 4.00 4.00  
WR102 7.00-11.0 1.10 500 300 102-745-6 6.50 3.50 3.50  
WR90 8.20-12.4 1.10 500 225 90-745-6 5.50 3.50 3.50  
WR75 10.0-15.0 1.10 350 200 75-745-6 5.00 3.50 3.50  
WR75 10.0-15.0 1.10 550 200 75-745A-6 5.00 4.50 4.50  
WR62 12.4-18.0 1.10 250 200 62-745-6 4.50 3.00 3.00  
WR51 15.0-22.0 1.15 220 120 51-745-6 4.13 2.25 2.25  
 WR51 15.0-22.0 1.15 260 120 51-745A-6 4.50 3.00 3.00  
WR42 18.0-26.5 1.15 230 120 42-745-6 4.50 2.25 2.25  
WR34 22.0-33.0 1.15 150 80 34-745-6 4.00 2.00 2.00  
WR28 26.5-40.0 1.15 125 50 28-745-6 4.00 2.00 2.00  
WR22 33.0-50.0 1.15 75 20 22-745-6 3.00 1.50 1.50  

Ordering Information
Waveguide Terminations
High Power, Series 745

 WR -Mod -F
Example part number:  75 -745 -6
Waveguide Size: (WR)
WR22 thru WR650 available		    
Basic Model No.: (-Mod)  
Flange (-F): 1=CPRG, 2=CPRF, 6=Cover, 7=Choke
See ATM Standard Flange page for more info.

* The Standard Model Numbers above are the most common parts ordered for size, material and flange. However, these models can easily be altered for your needs by using the Model # code system at left.

 

Rectangular Waveguide Termination - Very High Power - 760 Series
Very High Power Waveguide Termination - Series 760

Very High Power Waveguide Termination - Series 760
Very High Power Waveguide Termination - Series 760 Diagram

Very High Power Waveguide Termination - Series 760 Diagram
  • Full waveguide frequency.
  • Units pressure tested to 10 PSI.  Higher pressure is available upon request.
  • Finish: Hi-Temp black paint.
  • Low outgassing characteristics.
  • VSWR: 1.15 max typical, see outline .pdf
  • Series 760 Terminations are manufactured from 6061 Aluminum.
  • ATM Series 760 Terminations utilizes High Power Ceramic Elements fired at 1300 C for low VSWR and stable electrical characteristics.
  • Units are best mounted in the horizontal plane with free air flow. The load temperature will vary depending on power levels and duration. If during use the surface temperature approaches 260°C at the hottest point, (normally where the first fin touches the waveguide body), forced air cooling should be used to prevent damage to the internal load element. Units can survive temperatures as high as 450 °C without damage for a short time.
WG Size Freq. (GHz)

Avg.
Power
(Watts)

 Peak
Power
(kW)		 Standard
Model No.*		 Dim. A
(Inches)		 Dim. B Dim. C Outline
Dwgs
WR650 1.12-1.70 8000 5500 650-760-2 29.88 16.00 13.25 Dwg
WR430 1.70-2.60 6500 4000 430-760-2 16.67 9.00 9.00 Dwg
WR340 2.20-3.30 5500 3500 340-760-2 16.67 9.00 9.00 Dwg
WR284 2.60-3.95 5000 3200 284-760-6 13.75 6.00 6.00 Dwg
WR229 3.30-4.90 4000 2000 229-760-2 13.75 6.00 6.00 Dwg
WR187 3.95-5.85 3000 2000 187-760-6 18.00 6.00 6.00 Dwg
WR159 4.90-7.05 3000 1000 159-760-2 21.50 6.00 6.00 Dwg
WR137 5.85-8.20 3000 710 137-760-2 18.00 6.00 6.00 Dwg
WR112 7.05-10.0 3000 550 112/187-760-6 20.00 6.00 6.00 Dwg
WR112 7.05-10.0 1900 460 112-760-6 8.80 5.00 5.00 Dwg
WR90 8.20-12.4 4500 450 90/187-760-6 24.00 6.00 6.00 Dwg
WR90 8.20-12.4 1100 290 90-760-6 9.81 5.00 5.00 Dwg
WR75 10.0-15.0 3500 270 75/187-760-6 24.83 6.00 6.00 Dwg
WR75 10.0-15.0 1000 200 75-760-6 7.75 4.50 4.50 Dwg
WR62 12.4-18.0 3000 200 62/187-760-6 24.63 6.00 6.00 Dwg
WR62 12.4-18.0 900 160 62-760-6 7.86 4.50 4.50 Dwg
WR51 15.0-22.0 775 150 51-760-6 7.75 4.50 4.50 Dwg
WR42 18.0-26.5 600 120 42-760-6 5.50 2.25 2.25 Dwg
WR34 22.0-33.0 500 100 34-760-6 6.37 2.25 2.25 Dwg
WR28 26.5-40.0 200 100 28-760-6 6.56 2.25 2.25 Dwg

Ordering Information
Waveguide Terminations
Very High Power - 760 Series

 WR -Mod -F
Example part number:  75 -760 -6
Waveguide Size: (WR)
WR22 thru WR650 available		    
Basic Model No.: (-Mod)  
Flange (-F): 1=CPRG, 2=CPRF, 6=Cover, 7=Choke
See ATM Standard Flange page for more info.

* The Standard Model Numbers above are the most common parts ordered for size, material and flange. However, these models can easily be altered for your needs by using the Model # code system at left.

 

Rectangular Waveguide Termination - Super High Power - 780 Series
Super High Power Waveguide Termination - 780 Series

Super High Power Waveguide Termination - 780 Series

  
Super High Power Waveguide Termination - 780 Series Diagram

Super High Power Waveguide Termination - 780 Series Diagram
  • Full waveguide frequency.
  • Units pressure tested to 10 PSI.  Higher pressure is available upon request
  • Finish: Hi-Temp black paint or Chemfilm Conversion Coating
  • Low outgassing characteristics.
  • VSWR: 1.10 typical, 1.15 max.
  • Series 780 Terminations are manufactured from 6061 Aluminum.
  • ATM Series 780 Terminations utilize High Power Ceramic Elements fired at 1300 C for low VSWR and stable electrical characteristics.
  • ATM Series 780 Terminations have specially designed elements that distribute the heat throughout the entire length of the unit to allow for much higher power specifications and uniform heat dissipation.
  • Units are best mounted in the horizontal plane with free air flow. The load temperature will vary depending on power levels and duration. If during use the surface temperature approaches 260°C at the hottest point, (normally where the first fin touches the waveguide body), forced air cooling should be used to prevent damage to the internal load element. Units can survive temperatures as high as 450 °C without damage for a short time.
WG Size Freq. (GHz) Avg. Power
(Watts)		 Peak
Power (kW)		 Standard
Model No.*		 Dim. A
(Inches)		 Dim. B Dim. C Outline
Dwgs
WR112 7.05-10.0 3000 550 112-780-6 20.00 5.00 5.00 .pdf
WR90 8.20-12.4 1700 290 90-780-6 15.00 4.00 4.00 .pdf
WR75 10.0-15.0 1500 250 75-780-6 14.00 5.00 4.48 .pdf
WR62 12.4-18.0 900 160 62-780-6        
WR51 15.0-22.0 775 150 51-780-6 12.00 3.25 3.15  
WR42 18.0-26.5 600 120 42-780-6 11.00 3.00 3.00  
WR34 22.0-33.0 550 100 34-780-6 11.00 3.00 3.00  
WR28 26.5-40.0 500 100 28-780-6 7.00 2.50 2.50 .pdf
WR22 33.0-50.0 500 100 22-780-6 7.00 2.50 2.50 .pdf

Ordering Information
Waveguide Terminations
Super High Power - 780 Series

 WR -Mod -F
Example part number: 28 -780 -6
Waveguide Size: (WR)
WR22 thru WR112 available		    
Basic Model No.: (-Mod)  
Flange (-F): 6=Cover, 8=Cover/Groove
See ATM Standard Flange page for more info.

* The Standard Model Numbers above are the most common parts ordered for size, material and flange. However, these models can easily be altered for your needs by using the Model # code system at left.

For flanges other than shown, please contact the factory.

Note: All 780 series terminations are aluminum construction only.