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Where To Find This Example

AWR Version

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15

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Understanding AWR .emz Files

AWR Version

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14

HTML
<button class="gh-button gh-green" title = "https://awrcorp.com/download/kb.aspx?File=/1314_Examples/Filter_S21_vs_F_Fo.emz" onclick="window.location.href='https://awrcorp.com/download/kb.aspx?File=/1314_Examples/Filter_S21_vs_F_Fo.emz' ">Download Project</button>

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Whereas Microwave Office plots frequency f as the x-axis, in some applications, like filters, it may be required to plot a response as a function of f/fo on the x-axis.   This project plots S21 as a function of normalized frequency f/fo by using output equations  equations for a simple behavioral filter.    

Overview

In order to plot S21 with a modified x-axis of f/fo, this project calculates f/fo x-axis points with output equations.   Output equation pulls out the S21 data from the graph, pulls the simulation frequencies using the swpvals variable, sets fo=7GHz, and calculates f/fo.   The graph "S21 vs norm f" uses an output equation to plot the S21 against the new x-axis.

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The variable _FREQ makes the simulation frequency available as a variable withing Microwave Office.   In the output equations _FREQ is divided by the chosen center frequency for the example, fo,   in order to generate the normalized frequency "fnew" for the new x-axis.   The S-parameter data is captured into a variable by the equation statement S21 = Schematic 1: DB(|S[2,1]|).  

Graph on New X-Axis

The graph "S21 vs norm f" plots S21 on the "fnew" axis of f/fo.    The measurement uses an output equation result  result

Schematic - Filter

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Graph - S11 and S21

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