Combining AC Signals Through an Inductor/Resistor Network

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SUMMARY

Combining two AC signals of the same frequency, voltage, and current through an inductor-resistor (L-R) network is feasible, but it may not yield a pure sinewave output. Phase correction using an L-R network can result in voltage loss, potentially leading to unequal signal voltages. For optimal results, especially when connecting power generators in parallel, it is crucial to align the phases before connection. Utilizing a power splitter/combiner, such as the Miteq PD2-120/240-200S, with a 1.25 ns delay can effectively sum two 10-volt, 200 MHz signals with a 90-degree phase difference, achieving a power output that is the sum of the inputs minus 0.35 dB.

PREREQUISITES
  • Understanding of AC signal properties, including frequency and phase.
  • Familiarity with inductor-resistor (L-R) networks and their effects on signal voltage.
  • Knowledge of power combiners and their operational principles.
  • Experience with RF signal transmission, particularly using RG-8 cables.
NEXT STEPS
  • Research the specifications and applications of the Miteq PD2-120/240-200S power splitter/combiner.
  • Learn about phase correction techniques in L-R networks for AC signals.
  • Explore the theory and practical applications of power combiners in RF engineering.
  • Investigate methods for aligning phases of AC signals before parallel connection of power generators.
USEFUL FOR

Electrical engineers, RF engineers, and technicians working with AC signal processing, particularly those involved in power generation and signal combining applications.

Idea04
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Is it possible to combine two AC signals that are slightly out of phase, but have the same frequency, voltage and current through an inductor, resistor series network.
 
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You can combine them anyway, without doing anything. You just might not get a sinewave output.

If you do a phase correction with an L-R network, you will lose some voltage so you may not have signals with the same voltage any more.

If you are thinking about doing this with power generators in parallel, it would be better to get the generators in phase before you connect them in parallel.
 
So can inductors and resistors in series align the phases of two AC signals so they add voltages.
 
If you have two 10-volt, 200 MHz signals on RG-8 cables, and their phase difference is 90 degrees, put them into a power splitter/combiner like this:
http://www.miteq.com/products/viewmodel.php?model=PD2-120/240-200S
See outline at
http://www.miteq.com/products/viewmodel.php?model=PD2-120/240-200S
Put a 1.25 ns delay in one leg. The power output will be the sum power of the two inputs minus 0.35 dB.
Here is some background theory on power combiners:
http://www.highfrequencyelectronics.com/Archives/Jan08/HFE0108_GrebennikovPart2.pdf
Bob S
 
Last edited:
So can inductors and resistors in series align the phases of two AC signals so they add voltages.

Within limits. The output of one such stage will be phase shifted from the input and you could bring it into phase with another signal that is not phase shifted.

However just passing the signal through such a network reduces the voltage output.

Do you have some application in mind? Are these signals sinewaves and at what voltage and frequency?
 
The signals are sine waves at 2 volts and 60 Hz.
 
Is there a constant phase difference between them? How is it caused?
 
Where do the 2 signals come from, and what do you want to do with them?
 
Can i add two inverters's output. so that i could get combined value of both.

The output AC from both is exactly at same phase difference, same voltage, same current etc.

Please reply soon.

Thanks
 

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