27000-40

Series:	--
Part Status:	Active
Coupler Type:	Standard
Frequency:	2GHz ~ 18GHz
Coupling Factor:	40dB
Applications:	General Purpose
Insertion Loss:	0.5dB
Power - Max:	400W
Isolation:	--
Return Loss:	--
Package / Case:	Module
Supplier Device Package:	Module

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RF Directional CouplerRadio frequency (RF) directional couplers are devices that are used for measurement, power monitoring, and signal routing in RF systems. In this article, we will discuss the typical fields of application of RF directional couplers, as well as their basic working principles.RF directional couplers are important components of an RF system, as they allow for signal measurements and power-level monitoring of different signals at various frequencies. By using directional couplers, measurements can be made without having to interfere with the original signal, as the couplers can accurately detect power levels even at very low levels. In addition, it may also be used to equally split signals over multiple paths, allowing for signal routing and distribution in RF systems.RF directional couplers make use of the concept of signal-coupling. This is when a portion of the input signal is coupled into a separate output port in a controlled manner. This coupling process occurs through a mutual inductive, capacitive, or resistive transmission line, which is referred to as a coupler element. By adjusting the coupling factor of the coupler element, it is possible to control the amount of power that is being coupled, as well as the phase angle of the output signal.There are a variety of directional coupling circuits that may be used depending on the application. The most common type of RF directional coupler is the symmetrical “T” coupler, which is made up of three ports – the input port, the output port, and a through port. In this type of coupler, the input signal is split equally into the output and the through port. This type of coupler is mainly used for signal distribution and isolation applications.Another type of RF directional coupler is the asymmetrical “I” coupler, which consists of four ports – the input port, the output port, a coupled port, and a through port. In this type of coupler, the input signal is split unevenly, with a portion of the signal being directed to the output port and a smaller portion of the signal being directed to the coupled port. This type of coupler is mainly used for power-level measurements, as the varying amplitudes of the signals in the output and coupled ports can be used to determine the power level of the RF signal.In addition to these two types of RF directional coupler, there is also the directional bridge coupler, which is a combination of the symmetrical “T” coupler and the asymmetrical “I” coupler. This type of coupler is mainly used in applications where both signal-distribution and power-level measurements need to be done.In conclusion, RF directional couplers are essential components in any RF system, as they allow for measurements, routing, and power monitoring purposes. The most common types of couplers are the symmetrical "T" coupler, the asymmetrical “I” coupler, and the directional bridge coupler.Each type of coupler has its own specific applications, and the selection of the right coupler should be based on the requirements of the RF system.

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