Coaxial Passive Components

Directional Couplers

Directional couplers are used in a wide variety of applications and can satisfy almost any requirement for sampling incident and reflected microwave power conveniently and accurately with minimal disturbance to the transmission line. Some general applications for directional couplers include line monitoring, power measurements and load source isolators.

Specifications

Drawcom offers a wide selection of directional couplers designed to exceed commercial specifications. Standard coupling values of 6, 10, 20, 30 and 40 dB are available from stock. Custom configurations with special coupling values, external high power terminations and alternate connector styles or plating are also readily available in quantity. All models may be specified without an internal termination for bi-directional coupling. Passive intermodulation (PIM) compliant and weather resistant models are also available.

Theoretical Mainline Power Split Due to Coupling Factor (dB)
Coupling Factor  40 dB 30 dB 20 dB 10 dB 6 dB 3 dB
 Single 0.0004 0.0043 0.0436 0.4560 1.2560 3.01
Dual 0.0008 0.0086 0.0872 0.9120 2.5120 ~

When line monitoring, for the purpose of power level measuring and VSWR alarms, a directional coupler is used to sample power from the transmission line without altering line characteristics. In power measurements, insertion of a directional coupler in the transmission line allows measurement with simple low level detectors or field strength meters and power measuring equipment. By reversing the coupler in the transmission line, an indication of impedance match and/or reflected power can be derived by comparing the forward to reflected power levels. This may be more easily accomplished by using a dual directional coupler in the line. A signal can be taken from the source to the tap with high attenuation (directivity) between the tap and the load.

Part No.

Frequency (GHz)

Coupling Variation (Total)

Insertion Loss (Max)

Directivity (Min)

VSWR (Max)

cs

CS Series Directional Couplers, 50 Watts, SMA Female

CS10-1.400

0.800 - 2.000

10 ± 0.75 dB

0.3 dB

20 dB

1.20:1

CS10-1.500V

0.800 - 2.200

10 ± 0.75 dB

0.3 dB

22 dB

1.15:1

CS15-1.500V

0.800 - 2.200

15 ± 0.75 dB

0.3 dB

22 dB

1.15:1

CS20-1.500V

0.800 - 2.200

20 ± 0.75 dB

0.3 dB

22 dB

1.15:1

cn1

CN Series Directional Couplers, 50 Watts, N Female

CN10-1.500V

0.800 - 2.200

10 ± 0.75 dB

0.3 dB

20 dB

1.20:1

CN15-1.500V

0.800 - 2.200

15 ± 0.75 dB

0.3 dB

22 dB

1.15:1

CN20-1.500V

0.800 - 2.200

20 ± 0.75 dB

0.3 dB

22 dB

1.15:1

780780 Series - Stripline RF Coupler, 50 Watts, SMA Female
780-dB-0.750 0.500 - 1.000 ± 1.25 0.15 dB 20 dB 1.10:1
780-dB-1.500 1.000 - 2.000 ± 1.25 0.20 dB 25 dB 1.10:1
780-dB-3.000 2.000 - 4.000 ± 1.25 0.20 dB 22 dB 1.15:1
780-dB-3.900 2.600 - 5.200 ± 1.25 0.20 dB 20 dB 1.25:1
780-dB-6.000 4.000 - 8.000 ± 1.25 0.25 dB 20 dB 1.25:1
780-dB-9.700 7.000 - 12.400 ± 1.00 0.30 dB 17 dB 1.30:1
780-dB-11.750 7.500 - 16.000 ± 1.25 0.50 dB 12 dB 1.30:1
780-dB-15.200 12.400 - 18.000 ± 1.00 0.60 dB 15 dB 1.40:1

715715 Series Directional Couplers, 500 Watts, N Female
715-dB-0.600 0.400 - 0.800 ± 1.00 0.1 dB 25 dB 1.15:1
715-dB-0.900 0.800 - 1.000
0.600 - 1.200		 ± 0.60
± 1.60		 0.1 dB
0.1 dB		 30 dB
25 dB		 1.10:1
1.15:1
715-dB-1.500V 0.800 - 2.200 ± 1.75 0.1 dB 25 dB 1.15:1
715-dB-1.650W 0.800 - 2.500 ± 2.20 0.1 dB 25 dB 1.15:1
715-dB-1.950 1.700 - 2.200
1.300 - 2.600		 ± 0.60
± 1.20		 0.1 dB
0.1 dB		 25 dB
25 dB		 1.10:1
1.15:1
715-dB-3.100 2.000 - 4.200 ± 1.20 0.1 dB 25 dB 1.15:1

715S715S Series Directional Couplers, 100 Watts, SMA Female
715S-dB-0.600 0.400 - 0.800 ± 1.00 0.1 dB 25 dB 1.15:1
715S-dB-0.900 0.800 - 1.000
0.600 - 1.200		 ± 0.60
± 1.60		 0.1 dB
0.1 dB		 27 dB
25 dB		 1.10:1
1.15:1
715S-dB-1.500V 0.800 - 2.200 ± 1.75 0.1 dB 25 dB 1.15:1
715S-dB-1.650W 0.800 - 2.500 ± 2.20 0.1 dB 25 dB 1.15:1
715S-dB-1.950 1.700 - 2.200
1.300 - 2.600		 ± 0.60
± 1.60		 0.1 dB
0.1 dB		 25 dB
25 dB		 1.10:1
1.15:1
715S-dB-3.100 2.000 - 4.200 ± 1.20 0.1 dB 25 dB 1.15:1

722N722N Series Dual Directional Couplers, 500 Watts, N Female
722N-dB-0.600 0.400 - 0.800 ± 1.00 0.1 dB 25 dB 1.15:1
722N-dB-0.900 0.800 - 1.000
0.600 - 1.200		 ± 0.60
± 1.60		 0.1 dB
0.1 dB		 27 dB
25 dB		 1.10:1
1.15:1
722N-dB-1.500V 0.800 - 2.200 ± 1.75 0.1 dB 25 dB 1.15:1
722N-dB-1.650W 0.800 - 2.500 ± 2.20 0.1 dB 22 dB 1.15:1
722N-dB-1.950 1.700 - 2.200
1.300 - 2.600		 ± 0.60
± 1.20		 0.1 dB
0.1 dB		 25 dB
22 dB		 1.10:1
1.15:1
722N-dB-3.100 2.000 - 4.200 ± 1.20 0.1 dB 25 dB 1.15:1

722S722S Series Dual Directional Couplers, 100 Watts, SMA Female
722S-dB-0.600 0.400 - 0.800 ± 1.00 0.1 dB 25 dB 1.15:1
722S-dB-0.900 0.800 - 1.000
0.600 - 1.200		 ± 0.60
± 1.60		 0.1 dB
0.1 dB		 27 dB
25 dB		 1.10:1
1.15:1
722S-dB-1.500V 0.800 - 2.200 ± 1.75 0.1 dB 25 dB 1.15:1
722S-dB-1.650W 0.800 - 2.500 ± 2.20 0.1 dB 25 dB 1.15:1
722S-dB-1.950 1.700 - 2.200
1.300 - 2.600		 ± 0.60
± 1.20		 0.1 dB
0.1 dB		 25 dB
25 dB		 1.10:1
1.15:1
722S-dB-3.100 2.000 - 4.200 ± 1.20 0.1 dB 25 dB 1.15:1

722722 Series Dual Directional Coupler, 500 Watts, N Male to N Female
722-dB-0.600 0.400 - 0.800 ± 1.00 0.1 dB 25 dB 1.15:1
722-dB-0.900 0.800 - 1.000
0.600 - 1.200		 ± 0.60
± 1.60		 0.1 dB
0.1 dB		 27 dB
25 dB		 1.10:1
1.15:1
722-dB-1.500V 0.800 - 2.200 ± 1.75 0.1 dB 25 dB 1.15:1
722-dB-1.650W 0.800 - 2.500 ± 2.20 0.1 dB 25 dB 1.15:1
722-dB-1.950 1.700 - 2.200
1.300 - 2.600		 ± 0.60
± 1.20		 0.1 dB
0.1 dB		 25 dB
25 dB		 1.10:1
1.15:1
722-dB-3.100 2.000 - 4.200 ± 1.20 0.1 dB 25 dB 1.15:1

721721 Series Directional Coupler, 500 Watts, N Male to N Female
721-dB-0.600 0.400 - 0.800 ± 1.00 0.1 dB 25 dB 1.15:1
721-dB-0.900 0.800 - 1.000
0.600 - 1.200		 ± 0.60
± 1.60		 0.1 dB
0.1 dB		 27 dB
25 dB		 1.10:1
1.15:1
721-dB-1.500V 0.800 - 2.200 ± 1.75 0.1 dB 25 dB 1.15:1
721-dB-1.650W 0.800 - 2.500 ± 2.20 0.1 dB 25 dB 1.15:1
721-dB-1.950 1.700 - 2.200
1.300 - 2.600		 ± 0.60
± 1.20		 0.1 dB
0.1 dB		 25 dB
25 dB		 1.10:1
1.15:1
721-dB-3.100 2.000 - 4.200 ± 1.20 0.1 dB 25 dB 1.15:1