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Combining 2 Ports
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on Apr 3, 2007
on Apr 4, 2007 by SPINNER
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Is there any convenient way to combine 2 port data into 3,4.etc ports? Also, what is the best way to make a waveguide termination for s-parameter simulation?
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Apr 4, 2007 8:18 AM
1. There is a built-in example in ADS showing how to combine three 2-port data files into a single 3-port system. Look under:
2. There is a problem with using waveguide in any circuit simulator. The problem is that although the reflection coefficient is defined for waveguide as the ratio of transmitted power to reflected power, impedance is not well defined because waveguide does not have a TEM mode.
If you are using measured data, then you should terminate a port in whatever port reference impedance was used in the measured dataset.
There are some conventions, for Rectangular Waveguide, one is to take the impedance calculated by using the voltage at the center of the waveguide with respect to the power. ADS has such a termination in the element named RWGT, which can be found in the TLines-Waveguide component pallet.
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