CPL-5220-20-SMA-79

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RF Directional Coupler (CPL-5220-20-SMA-79)

A RF Directional Coupler (CPL-5220-20-SMA-79) is an electronic device used to couple radio frequency (RF) signals in a specific direction. The device is used in applications where a signal from a transmitter is to be monitored, or in which two or more transmitters sharing the same antenna need to be isolated from interference.

Application Field

The CPL-5220-20-SMA-79 is used in diverse applications ranging from broadcast, amateur radio and land mobile radio systems, to satellite and military electronics. The use of RF Directional Couplers is very common in applications such as cellular phone base stations, where high frequencies, isolation and accuracy of signal monitoring is required. Other applications for such couplers include monitoring power levels of TV or radio transmission stations, or radio direction finding systems.

Working Principle

The primary function of a RF Directional Coupler is to couple a small portion of the signal (tapped output) from the signal line, while at the same time keeping the signal unaltered. Due to the fact that the coupled signal is lower than the original, it can be used without causing any disturbance in the original signal. The CPL-5220-20-SMA-79 utilises a special design that enables the tapped output power to be a constant fraction of the signal travelling in the main path. This ensures constant accuracy and isolation to the signal, regardless of the power range.

The coupling factor (C) is an important parameter when using a RF Directional Coupler. By definition, it is the ratio of the signal which is coupled into the secondary path, to the signal which is travelling on the primary path. The device CPL-5220-20-SMA-79 design enables a very wide frequency range, with high Coupling Factor and Low Insertion Loss is achieved, whilst meeting all the necessary performance requirements.

In order to understand the working principle of a RF Directional Coupler, an example of its use in cellular base stations can be considered. First, radio frequency signals (RF) spread in all directions. As they reach the base station antenna, they are reflected back towards the tower. Here, the RF Directional Coupler is installed in the signal path, extracting a small portion of the signal (tapped output) and diverting it back to the tower, while the main signal volume remains unaffected. This signal (tapped output) is monitored and sent to potential users through the air interface.

Conclusion

The CPL-5220-20-SMA-79 is an excellent example of a RF Directional Coupler, providing high performance whenever high accuracy, isolation and frequency range are required. Its wide range of applications, varied power range compatibility and constant Coupling Factor functionality makes it the go-to choice for RF Directional Coupler users.

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