Info Passive Components

28 Mar.,2023

 

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A power divider, also called splitter, divides an incoming RF-signal to a number of outputs while maintaining the input impedance. Power dividers are used in communication systems, laboratories and radar applications.

A combiner operates in the opposite direction. A number of incoming signals are combined to one output. Combiners are used for increasing power in RF amplifiers.



Resistive power dividers are typically small and can be used on wide frequency bands starting at DC. Resistive power dividers cannot handle high power, loss is high and isolation is not the best. The design is fairly simple but with the right resistors they can have good frequency response. 3-way splitters are most common, but there are also star- and delta formed splitters.



Reactive power dividers have one input and two or more outputs. They can handle higher power. The design is either Wilkinson- or toroidal design. Reactive power dividers covers a wide frequency spectra, they offer low loss and high isolation between the ports.



The Wilkinson splitter, designed by Ernest Wilkson in the 60, can divide the input signal in the same phase and amplitude to the outputs. Main advantages are very good isolation between the ports, low loss and an attractive price for the performance. They can however be limited on band width and sometimes size is the problem.


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