Waveguide Terminations - Sliding Adjustable

Adjustable Sliding Waveguide Terminations

The 721 series sliding terminations are used in laboratory high precision measurements.  They are also ideal for field measurements and production setups requiring low VSWR.

The sliding load motion is controlled to a high degree of precision thru extremely accurate machining techniques. Travel of the termination is a minimum 1/2 wavelength at the lowest frequency enabling phase reversal.  Provisions are provided to lock the termination at any position.

Rectangular Waveguide Sliding Termination, Low Power - 721 Series
Rectangular Waveguide Sliding Termination
Rectangular Waveguide Sliding Termination - Diagram

TYPICAL SPECIFICATIONS

Electrical
Full waveguide frequency range.
VSWR: See table below.
ATM Series 721 Terminations utilize a precision conical element to achieve very low VSWR.
Precision grade waveguide is used for the transmission line.
Mechanical
Low out gassing characteristics.
Finish: Unique corrosion-resistant 316 stainless steel epoxy coating.
WG Size    Freq. (GHz) VSWR
Max		 Avg. Power
(Watts)		 Standard
Model No.*		 Minimum Travel
(Inches)		 Dim A
(Inches)  
WR430 1.70 - 2.60 1.020 8.0 430-721A-2 6.00 23.00
WR340 2.20 - 3.30 1.020 7.0 340-721A-2 4.50 18.00
WR284 2.60 - 3.95 1.020 5.0 284-721A-6 4.00 17.50
WR229 3.30 - 4.90 1.020 3.0 229-721B-2 3.00 13.50
WR187 3.95 - 5.85 1.020 3.0 187-721A-6 2.50 12.00
WR159 4.90 - 7.05 1.020 3.0 159-721B-2 2.00 11.00
WR137 5.85 - 8.20 1.020 2.0 137-721B-2 1.75 10.00
WR112 7.05 - 10.0 1.020 2.0 112-721B-6 1.60 9.00
WR102 7.00 - 11.0 1.025 2.0 102-721A-6 1.50 8.75
WR90 8.20 - 12.4 1.025 2.0 90-721A-6 1.30 8.00
WR75 10.0 - 15.0 1.025 2.0 75-721B-6 1.00 7.50
WR62 12.4 - 18.0 1.030 1.0 62-721B-6 0.75 6.50
WR51 15.0 - 22.0 1.040 0.5 51-721B-6 0.65 6.00
WR42 18.0 - 26.5 1.040 0.5 42-721B-6 0.55 5.50
WR34 22.0 - 33.0 1.040 0.5 34-721B-6 0.50 5.00
WR28 26.5 - 40.0 1.040 0.5 28-721B-6 0.45 4.50

Ordering Information
Rectangular Waveguide
Sliding Termination

 WR -Mod M -F
Example part number:  42 -721 B -6
Waveguide Size: (WR)
WR28 thru WR430 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.