20-11-2012, 03:22 PM
Power Dividers and Couplers
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Power Dividers and Couplers
In low frequency design, it is common to sum signals by adding their currents or voltages. In high frequency design direct summation is not used. Instead there is a class of circuits used to sum or split power.
Power Dividers and Couplers
Three port networks are shown here, but both dividers and combiners can be multi-port networks. The most common value for in splitter is –3 dB (when P2 = P3 ). The power ratio in splitter can range up to –40 dB for one path.
Directional Coupler
One specific class of power divider is the directional coupler. This is a four port device that samples the power flowing into port 1 coupled in to port 3 (the coupled port) with the remainder of the power delivered to port 2 (the through port) and no power delivered to the isolated port.
The Lossless T Junction
The simplest type of power divider is the T junction. T junction can be implemented using virtually any type of transmission line. However, the T junction is very simple to implement, it must be treated with care because it does not offer any isolation between its ports.