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Common Coupling Ratios

Coupling Value
Ratio
(%)
3 dB
50/50
6 dB

75/25
8 dB
85/15
10 dB
90/10
15 dB
97/3
20 dB
99/1

The first number of the ratio is the % of power that passes through the device to the output port.  The second is the % of power at the coupled port.
 
721 Series Directional Coupler Home > Directional Coupler > 721 Series

These "in-line" designs eliminate the need for connector adaptors that add loss and uncertainty to your critical measurements. MECA's 721 Series Directional Couplers are high power capable with extremely low insertion loss and are ideal for your system applications where precise monitoring, external leveling, signal mixing or swept transmission and reflection measurements are desired. Coupled ports are DC isolated and will only pass RF. Weather resistant models (IP61) also available.
 
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721 Series Directional Coupler Product Pic
Made in USA

Click on Catalog Number to view spec sheet with outline drawing
Catalog
Number		 Frequency
(GHz)		 Power
(W)		 Coupling
Variation
(Total)		 Insertion
Loss
(Max)		 Directivity
(Min)		 VSWR
(Max)
721-dB-0.6000.400 - 0.800500± 1.000.1 dB25 dB1.15:1
721-dB-0.9000.800 - 1.000
0.600 - 1.200		500± 0.60
± 1.60		0.1 dB
0.1 dB		27 dB
25 dB		1.10:1
1.15:1
721-dB-1.500V0.800 - 2.200500± 1.750.1 dB25 dB1.15:1
721-dB-1.650W0.800 - 2.500500± 2.200.1 dB25 dB1.15:1
721-dB-1.9501.700 - 2.200
1.300 - 2.600		500± 0.60
± 1.20		0.1 dB
0.1 dB		25 dB
25 dB		1.10:1
1.15:1
721-dB-3.1002.000 - 4.200500± 1.200.1 dB25 dB1.15:1
Lead-Free Solder

Nominal coupling values of 10, 20, 30 and 40 dB are standard. 721 series is also available in 6 dB. To order or specify, please insert coupling value in place of dB. EXAMPLE: S721-10-0.900 for silver-plated, single directional, 10 dB, 0.800 - 1.000 GHz.

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Average Power (Watts)
Coupling Factor 6 dB 10 dB 20 dB 30 dB 40 dB
721 Series Forward* 100 100 500 500 500
Reverse* 10 25 250 500 500
Theoretical Mainline Power Split Due to Coupling Factor (dB)
721 Series 1.2560 0.4560 0.0436 0.0043 0.0004

* For higher average power, couplers can be configured with external load based on your application.

Notes:
1. Excluding theoretical insertion loss due to coupling (see table).
2. All units have a peak power rating of 10 kW.
3. 50 ohm nominal impedance standard.
4. Operating temperature is from -55° C to +85° C.
5. Mounting holes 0.156” diameter thru in 2 places.
6. Variation includes flatness/sensitivity		 V-Line directional couplers cover all wireless bands from cellular through UMTS (0.800 - 2.200 GHz) making them ideally suited for BTS and In-Building Wireless applications. Typically available from STOCK!

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