1H0565-3

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RF Directional Couplers are important components of modern radio communication systems. They can be used to split, combine, and divert RF signals. The specific device we are discussing here is a model called 1H0565-3. This article will explain the application fields of this model and the working principle behind it.

Application Field of 1H0565-3

The 1H0565-3 is mainly used in cellular base station antenna systems. It functions as a power divider or combiner, allowing an antenna to be shared between two or more different transceivers. This coupler can also be used as a signal monitoring tool, allowing the signal power and balance between the antennas to be measured and calibrated. Other common applications include impedance matching and interference cancellations in FM transmitter or receiver sites.

Working Principle

A RF Directional Coupler, such as the 1H0565-3, consist a of multi-layer structure. It typically includes four components: an input port, an output port, a coupled port, and a tap port. All these ports are placed on the same side. Using the input port as an example, when the RF signal passes the internal microstrip line, part of it will be coupled to the microstrip line and emerge at the coupled port. Because the RF will be repeatedly split in the gate, the DC signals in the coupled port and the tap port will change according to the coupling coefficient.

In the 1H0565-3, several microstrip line segments with different lengths are connected in parallel, forming a directional coupler. Thus, the summation of the signals that arrive from different paths gets cancellated or added in phase, forming the desired coupling coefficient. This model has a frequency range of 20MHz-3000MHz.

Conclusion

The 1H0565-3 is an RF Directional Coupler that can split, combine, and divert RF signals. It is most commonly used in cellular base station antenna systems as a power divider or combiner, or as a signal monitoring tool. This model has a frequency range of 20MHz-3000MHz. Using the directional coupling technique, it can obtain the desired coupling coefficient without increasing the circuit size.

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