p05-000802 - Procedure #5 Wireless Circuits and Systems...

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Procedure #5 University of South Florida p05-000802 1 Wireless Circuits and Systems Laboratory Procedure #5 Using the Linecalc Program in ADS Linecalc is a program contained within the ADS suite that can be used to analyze a wide variety of different transmission line types. For example, with microstrip, you can specify the substrate parameters (primarily thickness and dielectric constant) and use Linecalc to calculate the impedance for a given line width; this is the “analysis” mode. You can also specify the substrate and the characteristic impedance, and have Linecalc determine the necessary line width; this is the “synthesis” mode. The techniques used in Linecalc are flexible and accurate, taking into account metal thickness, conductivity, frequency dependence, etc. The procedure outlined below explains how to use Linecalc for analyzing microstrip, and also for analyzing “coupled” microstrip lines (two strips which are in close proximity). Linecalc is started from within a circuit schematic window, by clicking on the Tools button in the top menu row. Word of caution: You may find Linecalc behaving somewhat stubbornly during your simulations. For example, it may continue to reset the frequency to an undesired value after you try to change the frequency and then re-analyze or re-synthesize. Or, it may not allow you to change to a certain unit measure of length (microns, mm, etc.) This type of situation is usually a result of transmission line parameters (physical or electrical) becoming either too small or too large for the current units/precision you are using. 1. Using Linecalc to Characterize Microstrip Transmission Lines After successfully starting Linecalc: 1. The first thing you may want to do is save your Linecalc simulation: click on File>Save As and change directories to your project directory (you may also want to go into your Networks directory to save the file). We will call this file micro-1.lcs, for the purpose of demonstration. At a later date, you can open this file within Linecalc and modify the parameters as necessary. 2. Select the frequency to a value that lies approximately in the center of the band that you are interested in; for this example we will choose 1.5 Ghz. Frequency is found in the Component Parameters in the lower left-hand side of the window. 3. Now we will specify the type of transmission line. In the Component Type window, click on the Select. .. button.
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p05-000802 - Procedure #5 Wireless Circuits and Systems...

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