HDH-00810GID(40)

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RF Directional Couplers are passive 2-port electrical circuits used for coupling of radio-frequency signal power from one circuit to another. The directional coupler, where one port is isolated from the other ports, is an important multifunctional device that provides very useful measurements of the signal power, including forward power, reflected power, and available isolation. The HDH-00810GID (40), part of the family of High Dynamic Range Directional Coupler from Hengjie, is well suited to measure these signal powers accurately and efficiently.

Application Field

The HDH-00810GID (40) Directional Coupler works in a wide frequency range of 824~849 MHz and supports almost any kind of wireless communication. It is designed for use in wireless systems requiring precise RF power monitoring and control such as GPRS, CDMA, and LTE Base Station Transmitters. It is also widely used as an RF detection and control tool in microwave radios and communications, navigation systems, civil and military radio systems, digital television broadcast, power amplifier monitoring, wireless system testing, and measurement instruments.

Working Principle

The working principle of the HDH-00810GID (40) Directional Coupler is based on the physics of electromagnetic fields. A directional coupler works by taking advantage of the interaction between the electromagnetic fields generated by one circuit (port 1) and another circuit (port 2). In the coupler, two coupled transmission lines are arranged parallel to each other, and the fields of each line interact with the fields of the other line and couple some of the energy from one line to the other. This phenomenon is known as electromagnetic coupling.

The amount of power coupled from one line to the other depends on the distance between the two ports, the type of medium used, and the impedance of the circuits. The HDH-00810GID (40) Directional Coupler is designed with unique impedance and distance values that are optimized for the frequency range of operation 824~849 MHz. Because the power coupling is inversely proportional to the square of the distance, this design allows for precise and accurate power measurement over this frequency range.

The directional coupler works as a four-port network, with a port connected between the two coupled lines. This port enables the measurement of power flow in both directions on the coupled lines. For example, it can be used to measure the forward power, which is the power traveling from port 1 to port 4, and the reverse power, which is the power traveling from port 4 to port 1.

The coupler also provides isolation between its two ports, which means that the signals of one port are blocked from the other port. The HDH-00810GID (40) Directional Coupler offers a very high isolation of greater than 40 dB over its 824~849 MHz frequency range, allowing it to be used as a high-performance power isolation tool.

Conclusion

The HDH-00810GID (40) Directional Coupler is a high-performance directional coupler designed for 824~849 MHz wireless systems. It offers precise and accurate power measurements over this frequency range, and very high isolation of greater than 40 dB. It is widely used in wireless systems, microwave radios and communications, navigation systems, digital television broadcast, power amplifier monitoring, wireless system testing, and measurement instruments.

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