Directional Couplers

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A directional coupler is used to sample a portion of an input signal for test and/or monitoring purposes. This “sample” signal is typically of much less power than the original input signal.

The coupling value of a directional coupler defines the difference in power between the input signal and the “sample” signal as it is observed at the coupled port. DETI offers a complete line of 6, 10, 16, 20 and 30 dB couplers covering selected frequency bands up to 18 GHz.

 

Coupling
The attenuation of a signal injected into the input port as seen at the coupled port.

Coupling flatness
The maximum variation in the coupling value over a specified frequency range.

Insertion Loss
The loss of unrecoverable power dissipated within the unit.

The following coupling loss have to be added to obtain mainline loss.

Coupling Loss
Power lost from the input signal due solely to the power transferred to the coupling arm of the devise.

Mainline loss
The difference in power between the input signal and the output signal. It is the Insertion Loss and Coupling Loss.

Directivity
The level of output power at the coupled port when a signal is injected into the unit in the desired direction minus t he level of output power at t he coupled port when the same signal is inje cted in the opposite direction. In a bidirectional unit, it is the difference in output power between the two coupled ports as seen from a constant signal in the same direction.

VSWR
The VSWR (Voltage Standing Wave Ratio) at any given port (with all other ports terminated) defines the degree of mismatch between the input signal and the input port and thus is a measure of the loss of input signal at that port.

 

 

COAXIAL DIRECTIONAL COUPLERS

STANDARD UNI / BI DIRECTIONAL COUPLEUR

Freq.min.
(MHz)
Freq.max.
(MHz)
Coupling
(dB)
VSWR max. (Main line) Directivity
(dB) min.
IL (dB max.) Power  max. (W CW max.) P/N
470 870 6 1,25:1 18 0.45 50 CD-1-470-870-6-50-SF
470 870 10 1,25:1 18 0.45 50 CD-1-470-870-10-50-SF
470 870 20 1,25:1 18 0.45 50 CD-1-470-870-20-50-SF
500 2000 20 1,20:1 23 0.4 50 CD-1-500-2000-20-50-SF
500 4300 10 1,25:1 20 0.5 50 CD-1-500-4300-10-50-NF
500 4300 30 1,25:1 20 0.5 50 CD-1-500-4300-30-50-NM
500 18000 10 1,40:1 12 1.6 50 CD-1-500-4300-30-50-NM
500 18000 20 1,40:1 12 1.6 50 CD-1-500-4300-30-50-NM
1000 2000 10 1,25:1  18 0.45 50 CD-1-1000-2000-10-50-SF
1000 2000 20 1,25:1  18 0.45 50 CD-1-1000-2000-20-50-SF
1000 4000 6 1,30:1  20 1 50 CD-1-1000-4000-6-50-SF
1000 4000 10 1,30:1  20 1 50 CD-1-1000-4000-10-50-SF
1000 4000 20 1,30:1  20 1 50 CD-1-1000-4000-20-50-SF
1000 12400 10 1,35:1  15 1.1 50 CD-1-1000-12400-10-50-SF
1000 12400 20 1,35:1  12 1.1 50 CD-1-1000-12400-20-50-SF
1000 18000 10 1,35:1 16 1.3 50 CD-1-1000-18000-10-50-SF
1000 18000 16 1,35:1 12 1.2 50 CD-1-1000-18000-16-50-SF
1000 18000 20 1,35:1 12 0.9 50 CD-1-1000-18000-20-50-SF
2000 4000 10 1,25:1 12 0.45 50 CD-1-2000-4000-10-50-SF
2000 4000 20 1,25:1 12 0.45 50 CD-1-2000-4000-20-50-SF
2000 8000 10 1,30:1  20 1 50 CD-1-2000-8000-10-50-SF
2000 8000 20 1,30:1  20 0.45 50 CD-1-2000-8000-20-50-SF
2000 18000 6 1,40:1 12 0.7 50 CD-1-2000-18000-6-50-SF
2000 18000 10 1,40:1 12 0.6 50 CD-1-2000-18000-10-50-SF
2000 18000 16 1,40:1 12 0.6 50 CD-1-2000-18000-16-50-SF
2000 18000 20 1,40:1 12 0.7 50 CD-1-2000-18000-20-50-SF
2500 3000 10 1,25:1 27 0.3 50 CD-1-2500-3000-10-50-SF
3650 6450 10 1,30:1 18 0.7 50 CD-1-3650-6450-10-50-SF
3650 6450 20 1,30:1 18 0.9 50 CD-1-3650-6450-20-50-SF
3650 6450 30 1,30:1 18 0.9 50 CD-1-3650-6450-30-50-SF
4000 8000 10 1,30:1 15 0.7 50 CD-1-4000-8000-10-50-SF
4000 12400 10 1,30:1 17 0.7 50 CD-1-4000-12400-10-50-SF
4000 12400 20 1,30:1 17 0.6 50 CD-1-4000-12400-20-50-SF
4000 18000 10 1,40:1 12 1.0 50 CD-1-4000-18000-10-50-SF
4000 18000 20 1,40:1 12 0.9 50 CD-1-4000-18000-20-50-SF
4000 20000 6 1,40:1 15 1.0 50 CD-1-4000-20000-6-50-KF
4000 20000 10 1,40:1 15 1.0 50 CD-1-4000-20000-10-50-KF
4000 20000 20 1,40:1 15 0.7 50 CD-1-4000-20000-20-50-KF
6000 18000 6 1,40:1 15 1.0 50 CD-1-6000-180000-6-50-SF
6000 18000 10 1,40:1 15 1.0 50 CD-1-6000-180000-10-50-SF
6000 18000 20 1,40:1 12 0.9 50 CD-1-6000-180000-20-50-SF
7500 16000 20 1,40:1 15 1.1 50 CD-1-7500-16000-20-50-SF

 

HIGH POWER UNI / BI DIRECTIONAL COUPLER

Freq.min.
(MHz)
Freq.max.
(MHz)
Coupling
(dB)
VSWR max. (Main line) Directivity
(dB) min.
IL (dB max.) Power  max. (W CW max.) Peak power
(Kw)
P/N
1000 3000 20 1,15:1 20 0.3 160   CD-1-1000-3000-20-160-NF
1200 1400 40 1,20:1 20 0.2 600 6 CD-1-1200-1400-40-600-NF
1200 1400 30 1,20:1 20 0.2 1000 10 CD-1-1200-1400-30-1000-NF
1200 1400 40 1,20:1 20 0.2 1000 10 CD-1-1200-1400-40-1000-NF
1200 1400 50 1,20:1 20 0.2 1000 10 CD-1-1200-1400-50-1000-NF
6000 18000 25 1,25:1 20 0.3 200 2 CD-1-6000-18000-25-200-TF
6000 18000 30 1,25:1 20 0.3 200 2 CD-6000-18000-30-200-TF

 

DUAL DIRECTIONAL COUPLER

Freq. min.
(MHZ)
Freq. max.
(MHz)
Coupling
(forward)
(dB)
Coupling
(reverse)
(dB)
VSWR max. (Main Line) Directivity
min. (dB)
IL (dB max.) Power max. (W CW max.) Peak power
(Kw)
P/N
1000 3000 20 20 1,15:1 20 (27 typ) 0.3 300 10 CD-2-1000-3000-20-20-300-TF
1000 4000 20 20 1,15:1 20 (27 typ) 0.3 160 3 CD-2-1000-4000-20-20-160-NM
1000 4000 20 20 1,15:1 20 (27 typ) 0.3 500 10 CD-2-1000-4000-20-20-500-NM
15000 18000 40 30 1,50:1 20 0.5 120 0.4 CD-2-15000-18000-40-30-120-TF
15500 17500 40 30 1.50:1 20 0.5 120 0.4 CD-2-15500-17500-40-30-120-TF

 

WAVEGUIDE DIRECTIONAL COUPLERS (UNI-BI-DUAL)

Freq. min.
(MHZ)
Freq. max.
(MHz)
Coupling
(forward)
(dB)
Coupling
(reverse)
(dB)
VSWR max. (Main Line) Directivity
min. (dB)
IL (dB max.) Power max. (W CW) Peak power
(Kw)
P/N
3600 4200 30 - 1,10:1 20 0.1 5 000   CD-1-3600-4200-30-5000-WR229
5850 7000 50 - 1.10:1 20 0.1 5000   CD-1-5850-7000-50-5000-WR137
34500 35500 40 30 1,30:1 20 0.5 150 1.5 CD-2-34500-35500-40-30-150-WR28
34500 35500 40 30 1,30:1  20 0.5 150 1.5 CD-2-34500-35500-40-30-150-WR28-K