Sonnet User's Guide - Sonnet Software

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Sonnet User’s Guide Metal Box Walls Port Transmission Line Device Under Test (DUT) Transmission Line Port General layout of a circuit to be analyzed with em. Upon completion of the de-embedding process, em outputs de-embedded S-parameter results, transmission line parameters and the calculated port discontinuities. An abbreviated summary of the de-embedding algorithm used is presented in reference [76] and the complete theory is presented in reference [77] in Appendix II, “Sonnet References” on page 353. For a discussion of the de-embedding technique used for co-calibrated ports see “Deembedding the Effect of a Local Ground Plane in Electromagnetic Analysis,” by James C. Rautio The article is available in PDF format in the Support section of our web site. Enabling the De-embedding Algorithm To demonstrate de-embedding with em, we will analyze the filter shown below. This is an example of a hairpin filter with a passband of approximately 4.0 to 4.15 GHz. This circuit consists of eight sections making up the filter metalization, two ports and two transmission lines connecting the ports to the filter metalization. Reference planes have been defined for port 1 and port 2 at the left and right edges 98
Chapter 7 De-embedding of the filter metalization, respectively. These reference planes instruct em to remove the effects of the transmission lines up to the filter metalization when deembedding is enabled. Filter Metalization (DUT) Port 1 Transmission Line Transmission Line Port 2 Port discontinuities and transmission lines at the upper left and lower right are removed from the em analysis results by enabling de-embedding. NOTE: Adding reference planes to a circuit in the project editor does not automatically enable de-embedding in em. However, the De-embed run option is set by default. You select the de-embed option in the Advanced Options dialog box in the project editor. This run option is set by default. To open the Advanced Options dialog box, select Analysis ⇒ Setup from the project editor main menu. Then click on the Advanced button in the Analysis Setup dialog box which appears. An analysis was performed on the filter starting at 3.95 GHz to 4.2 GHz in 0.002 GHz steps with the de-embedding option on. 99
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