Directional couplers are RF passive devices that couple part of the power from one transmission line to another and sample the incident and reflected power.

Directional couplers are RF passive devices that couple part of the power from one transmission line to another and sample the incident and reflected power. They allow for accurate sampling and coupling of signals without causing any disturbance on transmission lines. Directional couplers are important devices in RF systems. These devices are commonly used in various applications, including signal monitoring, power measurement, feedback control, and signal distribution. In addition, they are available as dual-directional couplers (DDC), single-directional couplers (SDC), and bi-directional couplers (BDC).

RF directional couplers often use two transmission lines set close together, including a main transmission line (through-line), a coupled line (coupling arm), and often an isolation arm. The coupling arm allows a portion of the signal to be sampled or coupled. In addition, the directional couplers are four-port passive devices in which one port is isolated from the input port. Directional couplers are passive reciprocal networks. All four ports are matched, and the circuit is lossless. They only couple power flowing in one direction. Power entering the output port is coupled to the isolated port but not to the coupled port.

Corech is a leading directional couplers supplier & manufacturer in China. Our RF directional couplers mate with PIN, 1.85mm, 2.4mm, 2.92mm, N, SMA, BNC, and TNC connectors and 5dB to 50dB coupling values. The power rating ranges from 20 watts to 500 watts. Meanwhile, our directional couplers provide bandwidth, high directivity, and higher power. The directional coupler frequency range is from 0.02 GHz to 67 GHz for narrow, octave, dual, and multi-octave band applications. In addition, Corech is devoted to custom designs to meet your specific needs. We can print your logo or company information on the directional couplers. Over the years, our products have covered the USA, the UK, France, Italy, Sweden, Spain, Russia, South Africa, etc.

Specifications of a Directional Couplers

• Directivity: Measure the ability of the coupler to isolate signals propagating in forward and reverse directions. Directivity is expressed in dB.
• Coupling: The coupling factor is the ratio of incident power to the forward power, measured in dB.
• Insertion Loss: The power loss, due to the insertion of the device into the main transmission line, in decibels (dB).
• Isolation: The ratio of the power of the input port to the isolation port, measured in dB.
• VSWR: Measures how well the directional coupler port matches a given characteristic impedance.
• Bandwidth: Bandwidth is the frequency range over which the performance of the directional coupler falls within a specific limit.
• Transmission loss: The total loss in the mainline of a directional coupler is given by transmission loss and is the sum of insertion loss and coupling loss.

FAQs of Directional Couplers

1. What is the bulk production time and shipping time?
   – Bulk production time is 2-4 weeks. Shipping time is 3-6 days by express.
2. Is sampling available?
   – Yes, the sampling fee is XX USD. Then, the sampling time is 1-3 weeks.
3. What are the types of directional couplers?
   Dual-directional couplers (DDC), single-directional couplers (SDC), and bi-directional couplers (BDC).
4. What are the coupling values of directional couplers?
   5 dB to 50 dB coupling values.
5. What are the connector types of directional couplers?
   1.85mm, 2.4mm, 2.92mm, N, SMA, BNC, TNC connector and SMD.
6. What is the frequency range of the directional couplers?
   0.02 GHz to 67 GHz.
7. Application of directional couplers？
   Signal monitoring, power measurement, feedback control, signal distribution, etc.
8. Can the directional couplers be customized?
   Yes. Our engineers can customize the directional couplers according to your needs. In addition, we can print company information or logos on the directional couplers.