## Microwave Power Splitter Design using Resistors |
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In RF/microwave circuit design, when there are needs of splitting one signal power into two branches over a wide frequency band while the loss is somewhat tolerable, a resistive three-port network can be employed. This applet offers a means to choose the values of the three resistors according to the design goals in terms of return.insertion losses, under the given line impedances which can be different in general.
## Brief User' GuideThe user needs to supply the following information: - Characteristic impedance at each port, Z01, Z02, and Z03
- For each of {R1, R2, R3}, specify the range of the resistance value {minimum, maximum} and the number of data points to be sampled. NOTE: Any of the R values can be fixed by
- enter the constant resistor value in the Rmin entry
- set the number of points to "1"
- The applet will choose a number of choices of combinations of {R1, R2, R3} according to the design goals. This number for choices needs to be provided, the default is: NChoice=20
- The design goals are specified in terms of
- return losses for S11, S22, and S33
- insertion losses for S21, S31, and S32
- NOTE: either a ">" or "<" sign is required in those requirements
- each criterion is attched a weighting factor which represents the relative importance in the making the selections. A "0" value minimizes the importance of one particular goal
After setting all the input values, a click on the "Calculate" button will trigger a computation over all data points of {R1, R2, R3} while only the NChoice results are kept in arrays which are arranged in order of the degrees comforming to the design goals. And all the selections are plotted in return/insertion losses versus choice indices. A scrollbar offeres a way to inspect the particular selection in more details, i.e., the {R1, R2, R3} and all S-parameters will change according to the current choice index. A click on the "Clear" button erases all previous results. ## References[1] David M. Pozar, "Microwave Engineering", Chapter 5, Addison-Wesley, New York, 1990. [2] Robert J. Weber, "Introduction to Microwave Circuits, Radio Frequency and Design Applications", pp.325-326, IEEE Press, New York, 2001. |
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