Loop Couplers

SMA and Type-N Waveguide Loop Couplers

ATM manufactures waveguide loop couplers covering a wide frequency range. Multiple flange and coaxial connector types and configurations are available.

Our loop couplers are ideal for RF microwave applications where high power sensing is desired. These single arm waveguide loop couplers are available with SMA or Type-N connectors. Multi arm models are also available.

Rectangular waveguide loop couplers cover the full waveguide frequency with standard coupling values of 30db, 40db, 50db, and 60db, however other options are available upon request.

Double ridge waveguide loop couplers are also available. Pressure sealed loop couplers are also available for microwave applications that require sealed systems. For more information feel free to call us and discuss your needs with one of our design engineers.

GENERAL SPECIFICATIONS

● Full waveguide frequency range
● Ideal for High Power Sensing
● Single Arm standard, Multi-arm available
● Available in Aluminum or Brass (except WR340 & 430)
● Finish is a unique corrosion-resistant 316 stainless steel epoxy coating.
● Coupling: 30, 40, 50 or 60dB standard, others available upon request.
● VSWR Primary: 1.07 max (1.1 max WR42 thru WR28)
● VSWR Coax: 1.35 max (1.60 max. WR42 thru WR28)
● Nominal Coupling: +/- 1.00dB
● Frequency Sensitivity +/- 1.00dB max.
● Directivity: 15dB min., 20dB typ. (40, 50 or 60dB coupler)
● 12dB min., 15dB typ. (30 dB coupler)
● Option: Pressure Sealed Units: Add "/PT" to model number.
   Example P/N: 90-307A-dB-6-6
   Sealed P/N:     90-307A-dB-6-6/PT
   Note: Pressure sealed units will hold 15 psi assuming all waveguide
    and coax ports are mated and sealed.

Waveguide Loop Coupler - SMA (F)

Waveguide Loop Coupler - SMA

307 type

337 type

Standard Models

WG Size

Freq GHz

Basic Model No.*
SMA (F)

Dim A
(Inches)

Dim B max.
(Inches)

Dim C
(Inches)

Outline
Drawings

WR430

1.70 - 2.60

430-307A-dB-2-2

4.5

1.87

1.63

WR340

2.20 - 3.30

340-307A-dB-2-2

4.5

1.75

1.63

WR284

2.60 - 3.95

284-307A-dB-6-6

4.5

1.69

1.63

WR229

3.30 - 4.90

229-307A-dB-2-2

4.0

1.58

1.38

WR187

3.95 - 5.85

187-307A-dB-6-6

3.5

1.44

1.13

WR159

4.90 - 7.05

159-307A-dB-2-2

3.5

1.40

1.13

WR137

5.85 - 8.20

137-307A-dB-2-2

3.0

1.32

0.88

WR112

7.05 - 10.0

112-307A-dB-6-6

3.0

1.25

0.88

.pdf

WR90

8.20 - 12.4

90-307A-dB-6-6

3.0

1.19

0.88

WR75

10.0 - 15.0

75-307A-dB-6-6

3.0

1.18

0.88

.pdf

WR62

12.4 - 18.0

62-307A-dB-6-6

3.0

1.14

0.88

.pdf

WR51

15.0 - 22.0

51-337A-dB-6-6***

3.0

0.96

0.50

WR42

18.0 - 26.5

42-337A-dB-6-6***

3.0

0.75

0.50

WR34

22.0 - 33.0

34-337A-dB-6-6***

3.0

0.71

0.50

WR28

26.5 - 40.0

28-337A-dB-6-6***

3.0

0.67

0.40

.pdf

* Insert desired coupling value (30, 40, 50 or 60dB) in the model number where dB is listed

Ordering Information Waveguide Loop Couplers SMA (F)	WR	-Mod	M	-dB	-F1	-F2
Example part number:	90	-307	A	-30	-6	-6
Waveguide Size: (WR) WR28 thru WR284 available
Basic Model No.: (-Mod) -307 or -337
Material (M): A=Aluminum, B=Copper/Brass **** (WR340 & WR430 not available in Copper/Brass)
Coupling (-dB): 30, 40, 50 or 60 dB Standard **
Flange 1 (-F1): 1=CPRG, 2=CPRF, 6=Cover, 7=Choke***, 8=Seal Groove
Flange 2 (-F2): 1=CPRG, 2=CPRF, 6=Cover, 7=Choke***, 8=Seal 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 to the left.

** Customer must choose the coupling value appropriate for application (30dB, 40dB, 50dB or 60dB) and insert it in the model number where dB is listed

*** 337 Models not available with 7=Choke Flange

**** WR340 & WR430 available in Aluminum Only

Option: Add /PT to part number for pressure sealed unit to 15 psi.

For a dual unit modify the P/N by adding a D to the end of the basic model #, the direction of the coupling and the coupling value of the second coupling arm.

Example: 90-307A-dB-6-6 now becomes: 90-307AD-dBF-dBR-6-6
(where dBF= forward coupling and dBR= reverse coupling)

Waveguide Loop Coupler - Type-N (F)

Standard Models
WG Size	Freq GHz	Basic Model No. Type-N (F)*	Dim A (Inches)	Dim B (Inches)	Dim C (Inches)	Outline Drawings
WR430	1.70 - 2.60	430-308A-dB-2-2	4.5	2.50	1.63
WR340	2.20 - 3.30	340-308A-dB-2-2	4.5	2.30	1.63
WR284	2.60 - 3.95	284-308A-dB-6-6	4.5	2.20	1.63
WR229	3.30 - 4.90	229-308A-dB-2-2	4.0	2.09	1.38	Dwg
WR187	3.95 - 5.85	187-308A-dB-6-6	3.5	1.95	1.13
WR159	4.90 - 7.05	159-308A-dB-2-2	3.5	1.91	0.88
WR137	5.85 - 8.20	137-308A-dB-2-2	3.0	1.83	0.88
WR112	7.05 - 10.0	112-308A-dB-6-6	3.0	1.76	0.88	Dwg
WR90	8.20 - 12.4	90-308A-dB-6-6	3.0	1.70	0.88	Dwg
WR75	10.0 - 15.0	75-308A-dB-6-6	3.0	1.66	0.88	Dwg
WR62	12.4 - 18.0	62-308A-dB-6-6	3.0	1.62	0.88
* Insert desired coupling value (30, 40, 50 or 60dB) in the model number where dB is listed

Ordering Information Waveguide Loop Couplers Type-N (F)	WR	-Mod	M	-dB	-F1	-F2
Example part number:	90	-308	A	-30	-6	-6
Waveguide Size: (WR) WR28 thru WR430 available
Basic Model No.: (-Mod)
Material (M): A=Aluminum, B=Copper/Brass **** (WR340 & WR430 not available in Copper/Brass)
Coupling (-dB): 30, 40, 50 or 60 dB Standard **
Flange 1 (-F1): 1=CPRG, 2=CPRF, 6=Cover, 7=Choke***, 8=Seal Groove
Flange 2 (-F2): 1=CPRG, 2=CPRF, 6=Cover, 7=Choke***, 8=Seal Groove See ATM Standard Flange page for more info.

** Customer must choose the coupling value appropriate for application (30dB, 40dB, 50dB or 60dB) and insert it in the model number where dB is listed

*** 337 Models not available with 7=Choke Flange

**** WR340 & WR430 available in Aluminum Only

Option: Add /PT to part number for pressure sealed unit to 15 psi.

For a dual unit modify the P/N by adding a D to the end of the basic model #, the direction of the coupling and the coupling value of the second coupling arm.

Example: 90-308A-dB-6-6 now becomes: 90-308AD-dBF-dBR-6-6
(where dBF= forward coupling and dBR= reverse coupling)

Loop Couplers For Waveguide

SMA and Type-N Waveguide Loop Couplers