Agilent ADS Co-Simulation Overview

In addition to its tight integration into the CST DESIGN ENVIRONMENT, CST MICROWAVE STUDIO features strong interfaces with Agilent ADS庐. The latter ranges from using pre-computed S-parameter data in ADS庐 circuit simulations to using true EM / circuit co-simulations.

Overview

ADS Design Kit

ADS Links

Static Link

Dynamic Link

Design Kit Installation

How to Use the Static Link

How to Use the Dynamic Link

Import an ADS-Layout into CST MICROWAVE STUDIO

See also

ADS Design Kit

CST MICROWAVE STUDIO manages an ADS庐 Design Kit which contains a dynamically extended list of EM simulation components (CST MICROWAVE STUDIO projects or S-Parameter data files). The difference between the levels of integration is how simulation results are handled for a particular component.

The integration supports changing parameters of the 3D EM models directly from within the ADS庐 environment.

Static Link

The ”static” link (ADS庐 2003A and above) requires parametric CST MICROWAVE STUDIO results to be computed before the component is used within ADS庐. The results are written into a local database which is then interpreted by the component. The circuit simulator automatically interpolates the S-parameter between the pre-computed samples. The static link can be used for structures with up to 6 ports.

Dynamic Link

Moreover, the ”co-simulation” alternative enables ADS庐 to launch CST MICROWAVE STUDIO in order to automatically calculate required data. All information is stored together with the CST MICROWAVE STUDIO model to avoid unnecessary repetitions of lengthy EM simulations. The co-simulation interface requires ADS庐 2005A or above.

Design Kit Installation

Since the Design Kit is required for the static link as well as the dynamic link the following steps are needed for both links:

Refer to the ADS庐 documentation for more information on managing Design Kits.

How to Use the Static Link between CST MICROWAVE STUDIO and Agilent ADS

The static link can be used right after installing the Design Kit. The static link can be used for structures with up to 6 ports.

In the following, we explain how to add the results of an CST MICROWAVE STUDIO project as a component to the ADS庐 Design Kit.

How to Use the CST MICROWAVE STUDIO and Agilent ADS dynamic link (Co-Simulation)

A powerful feature of the co-simulation link is the ability to automatically launch CST MICROWAVE STUDIO from within ADS庐 if new S-parameter data are requested. This interface requires ADS庐 2005A or above and needs CST MICROWAVE STUDIO and ADS庐 to be installed on the same computer.

Do the following steps to setup a Co-Simulation:

 

Preparations in CST MICROWAVE STUDIO

Preparations in Agilent ADS

Final Remarks

The following picture shows a co-simulation component after it has been placed on the ADS庐 schematic:

The component’s options allow changing the interpolation type (1=yes, 0=no) and CST MICROWAVE STUDIO model parameters directly from within the ADS庐 environment. Furthermore the component displays information about the frequency range of the EM simulation.

 

The Design Kit component is now dynamically linked to the CST MICROWAVE STUDIO model. Whenever new S-parameter data for a particular parameter combination are computed, these data will become available to ADS庐 right away.

 

Note 1: Whenever a parametric model is used for ADS庐 co-simulation, it is advisable to test whether the structure update succeeds for various parameter combinations before creating the ADS庐 Design Kit component.

Note 2: If you are using CST MICROWAVE STUDIO version 2008 and later and if you want to use the components created by CST MICROWAVE STUDIO version 2006b or prior, special care needs to be taken. Please read "ADS Design Kit Compatibility Issues" for further information.

Note 3: The ADS Component Export 1D result template stores the S-parameter information in the Result folder in an MDIF file with the extension mdf.

Import an ADS-Layout into CST MICROWAVE STUDIO

Besides exchanging S-Parameter data there is also a possibility to exchange structure information between ADS庐 and CST MICROWAVE STUDIO.

To create a layout that can be imported by CST MICROWAVE STUDIO do the following:

Preparations in ADS

Preparations in CST MICROWAVE STUDIO

See also

ADS Design Kit Compatibility Issues, ADS Co-Simulation, Export Agilent ADS Component, ADS import options




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