Short Length High Directivity

High Directivity Waveguide Couplers

Narda-MITEQ's Short Length High Directivity Waveguide Couplers are used in applications requiring short insertion length with high directivity.

They are typically used to replace Crossguide Couplers where directivity can be marginal and short length is still important. Select from full wideband band units and shorter partial band units for each waveguide size.

Our high directivity couplers have standard coupling values of 20db, 30db, 40db or 50db. Additional coupling values are available, however the length of the coupler may change. Typical nominal coupling variation is of +/-0.5dB and flatness of +/-0.75dB are obtained by carefully controlled machining patterns.

Pressure sealed units are also available for microwave applications that require sealed systems. Please call us and discuss your needs with one of our design engineers.

Short Length, High Directivity Couplers - Single
Short Length High Directivity Waveguide Coupler - Single Tech Note #267 (PDF) has more info on SLHD Waveguide Couplers		GENERAL SPECIFICATIONS
		Electrical VSWR: 1.05 Primary arm 1.25 Secondary arm (1.40 for WR28, WR34, WR42; 1.5 for WR22) Std. coupling values: 20, 30, 40, 50dB (Other coupling values available, but length of unit may change) Coupling Accuracy: +/- 0.5dB Frequency Sensitivity: +/- 0.5dB Directivity: 25dB min, 30dB typical Mechanical Body: Aluminum Flanges: Multiple types available* - see Narda-MITEQ Std. Flanges Choosing a non-standard flange type may change length. Connectors:* Stainless Steel Operation Temp: Finish: Unique corrosion resistant 316 stainless steel epoxy coating IAW MIL-F-14072 Applicable Mil-Specs General: Product Specific: Options Pressure Sealed Units: Add "/PT" to model number. Example P/N: 34-331A-30-6-6 Sealed P/N: 34-331A-30-6-6/PT/PT Note: Pressure sealed units will hold 15 psi assuming all waveguide and coax ports are mated and sealed.
Standard Models
WG Size	Freq. (GHz)**	Standard Model No.*	Length (Inches)	Outline Drawings
WR430	1.70 - 2.60	430-339A-dB-2-2	48.0
WR430	1.82 - 2.18	430-331A-dB-2-2	26.0
WR340	2.20 - 3.30	340-339A-dB-2-2	36.0
WR340	2.78 - 3.22	340-331A-dB-2-2	19.0
WR284	2.60 - 3.95	284-339A-dB-6-6	25.0
WR284	2.90 - 3.10	284-331A-dB-6-6	16.0	Dwg
WR229	3.30 - 4.90	229-339A-dB-2-2	21.0
WR229	3.60 - 4.30	229-331A-dB-2-2	14.0
WR187	3.95 - 5.85	187-339A-dB-6-6	17.3
WR187	4.00 - 4.50	187-331A-dB-6-6	12.0
WR159	4.90 - 7.05	159-339A-dB-2-2	15.1
WR159	5.80 - 6.50	159-331A-dB-2-2	9.0
WR137	5.85 - 8.20	137-339A-dB-2-2	13.3
WR137	5.80 - 6.50	137-331A-dB-2-2	7.0
WR137	7.20 - 7.80	137-332A-dB-2-2	7.0
WR137	7.90 - 8.40	137-333A-dB-2-2	7.0
WR112	7.05 - 10.0	112-339A-dB-6-6	12.3
WR112	7.20 - 7.80	112-332A-dB-6-6	5.5
WR112	8.50 - 9.50	112-331A-dB-6-6	5.5
WR102	7.00 - 11.0	102-339A-dB-6-6	12.0
WR102	8.20 - 9.80	102-331A-dB-6-6	4.75
WR90	8.20 - 12.40	90-339A-dB-6-6	11.4
WR90	8.16 - 9.84	90-331A-dB-6-6	4.0	Dwg
WR75	10.0 - 15.0	75-339A-dB-6-6	9.2
WR75	10.7 - 12.7	75-331A-dB-6-6	3.0	Dwg
WR75	13.5 - 14.5	75-332A-dB-6-6	3.0	Dwg
WR62	12.4 - 18.0	62-339A-dB-6-6	8.1
WR62	15.0 - 18.0	62-331A-dB-6-6	3.0	Dwg
WR51	15.0 - 22.0	51-339A-dB-6-6	7.1
WR51	18.2 - 21.0	51-331A-dB-6-6	3.0
WR42	17.7 - 21.0	42-331A-dB-6-6	3.0	Dwg
WR42	18.0 - 26.5	42-339A-dB-6-6	6.6
WR34	22.0 - 33.0	34-339A-dB-6-6	6.5
WR34	27.8 - 32.2	34-331A-dB-6-6	2.75
WR28	26.5 - 40.0	28-339A-dB-6-6	5.4
WR28	27.3 - 32.7	28-331A-dB-6-6	2.5	Dwg
WR28	36.0 - 40.0	28-332A-dB-6-6	2.5	Dwg
WR22	33.0 - 50.0	22-339A-dB-6-6	5.4
WR22	40.0 - 44.0	22-331A-dB-6-6	2.5
** Units are available in full frequency band models [-339 Base Model] or shorter partial band models which designed for approximately 40% bandwidth. Consult factory for other specifications bands and specifications.

Ordering Information Short Length High Directivity Couplers - Single	WR	-Mod	M	-dB	-F1	-F2
Example part number:	112	-331	A	-30F	-6	-6
Waveguide Size: (WR) WR22 thru WR430 available
Basic Model No.: (-Mod)
Material (M): A=Aluminum, B=Copper/Brass
Coupling (-dB): 30, 40 or 50 dB Standard
Flange 1 (-F1): 1=CPRG, 2=CPRF, 6=Cover, 8=Seal Groove
Flange 2 (-F2): 1=CPRG, 2=CPRF, 6=Cover, 8=Seal Groove See Narda-MITEQ 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.

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

Short Length, High Directivity Waveguide Couplers - Dual
Short Length High Directivity Waveguide Coupler - Dual Tech Note #267 (PDF) has more info on SLHD Waveguide Couplers	GENERAL SPECIFICATIONS
Electrical VSWR: 1.05 Primary arm 1.25 Secondary arm (1.40 for WR28, WR34, WR42; 1.5 for WR22) Std. coupling values: 20, 30, 40, 50dB (Other coupling values available, but length of unit may change) Coupling Accuracy: +/- 0.5dB Frequency Sensitivity: +/- 0.5dB Directivity: 25dB min, 30dB typical Mechanical Body: Aluminum Flanges: Multiple types available* - see Narda-MITEQ Std. Flanges Choosing a non-standard flange type may change length. Connectors:* Stainless Steel Operation Temp: Finish: Unique corrosion resistant 316 stainless steel epoxy coating IAW MIL-F-14072 Applicable Mil-Specs General: Product Specific: Options Pressure seal Units: Units sealed to hold 10 psi. Add "/PT" to model number. Example: P/N 34-331DA-30-30-6-6 Sealed becomes: 34-331DA-30-30-6-6/PT

Short Length, High Directivity Waveguide Couplers - Dual

Short Length High Directivity Waveguide Coupler - Dual

Tech Note #267 (PDF) has more
info on SLHD Waveguide Couplers

GENERAL SPECIFICATIONS

Electrical
VSWR: 1.05 Primary arm
1.25 Secondary arm (1.40 for WR28, WR34, WR42; 1.5 for WR22)
Std. coupling values: 20, 30, 40, 50dB (Other coupling values available, but length of unit may change)
Coupling Accuracy: +/- 0.5dB
Frequency Sensitivity: +/- 0.5dB
Directivity: 25dB min, 30dB typical
Mechanical
Body: Aluminum
Flanges: Multiple types available* - see Narda-MITEQ Std. Flanges
*Choosing a non-standard flange type may change length.
Connectors: Stainless Steel
Operation Temp:
Finish: Unique corrosion resistant 316 stainless steel epoxy coating IAW MIL-F-14072
Applicable Mil-Specs
General:
Product Specific:
Options
Pressure seal Units: Units sealed to hold 10 psi. Add "/PT" to model number.
Example: P/N 34-331DA-30-30-6-6
Sealed becomes: 34-331DA-30-30-6-6/PT

Standard Models
WG Size	Freq. (GHz)**	Standard Model No.*	Length (Inches)	Outline Drawings
WR137	5.80 - 6.50	137-331DA-dBF-dBR-2-2	7.00
WR137	7.20 - 7.80	137-332DA-dBF-dBR-2-2	7.00
WR137	7.90 - 8.40	137-333DA-dBF-dBR-2-2	7.00
WR112	8.50 - 9.50	112-331DA-dBF-dBR-6-6	5.50
WR102	8.20 - 9.80	102-331DA-dBF-dBR-6-6	4.75
WR90	8.16 - 9.84	90-331DA-dBF-dBR-6-6	4.00
WR75	13.5 - 14.5	75-331DA-dBF-dBR-6-6	3.00
WR62	15.0 - 18.0	62-331DA-dBF-dBR-6-6	3.00
WR51	18.2 - 21.0	51-331DA-dBF-dBR-6-6	3.00
WR51	15.0 - 17.5	51-332DA-dBF-dBR-6-6	3.00
WR42	17.7 - 21.0	42-331DA-dBF-dBR-6-6	3.00
WR34	27.8 - 32.2	34-331DA-dBF-dBR-6-6	2.75
WR28	27.3 - 32.7	28-331DA-dBF-dBR-6-6	2.50
WR28	36.0 - 40.0	28-332DA-dBF-dBR-6-6	2.50	Dwg
WR22	40.0 - 44.0	22-331DA-dBF-dBR-6-6	2.50
** These units are designed for approximately 40% bandwidth, consult factory for other specifications

Ordering Information Short Length High Directivity Couplers - Dual	WR	-Mod	M	-dBF	-dBR	-F1	-F2
Example part number:	75	-331D	A	-30F	-40R	-6	-6
Waveguide Size: (WR) WR22 thru WR137 available
Basic Model No.: (-Mod)
Material (M): A=Aluminum, B=Copper/Brass
Fwd. Coupling (-dBF) 30, 40 or 50 dB Standard
Rev. Coupling (-dBR) 30, 40 or 50 dB Standard
Flange 1 (-F1): 1=CPRG, 2=CPRF, 6=Cover, 8=Seal Groove
Flange 2 (-F2): 1=CPRG, 2=CPRF, 6=Cover, 8=Seal Groove See Narda-MITEQ Standard Flange page for more info.

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

High Directivity Waveguide Couplers - Short Length

High Directivity Waveguide Couplers