HFSS15: Assign Near Field Wave

This section describes the Near Field Wave Options panel on the Incident Wave Source dialog box and how to assign near field waves. The following designs illustrate different ways of using near field sourcing to run a range of analyses on a dish antenna fed by a circular horn antenna.

First we will bring up the Near Field Wave Options panel and then, assign Near Field Wave.

1. Click HFSS>Excitations>Assign>Incident Wave>Near Field Wave.

Note: If you are using HFSS-IE go to HFSS-IE>Excitations>Assign>Near Field Wave

The Incident Wave Source : General Data dialog box appears.

2. Fill in the Excitation name and click Next to acccess the Near Field Wave Options panel.

Note: For array problems, the Active option includes the effects of the Near Field in the simulation. To disable the effects, uncheck the Active option.

3. Determine whether you want to use a linked design or an external data file. If you are using a linked design go to step 4. If you are using an external data file, go to Access Near Field External Data File and follow the instructions.

4. Click the Setup Link button on the Incident Wave Source dialog to specify the linked design.

Note: It is through the Setup Link dialog box that you will link the source design to your target design.

5. On the Setup Link dialog box select the radio button Edit Link.

The fields in the dialog box become active and editable as shown below.

6. Select the product in which you created your source design from the Product drop down list.

Note: Only HFSS, Maxwell, and SIWave appear in this list. An HFSS-IE project can be used as target but not as source; so it is not listed.

7. Specify the project that has the source design in one of the following ways:

a. Check Use This Project to pick a design from a current working project.

b. Click the ellipsis and browse your computer to pick the design.

8. Pick the source design from the Source Design drop-down menu which lists all the designs in the specified project.

9. Pick the setup type from the Source Solution pull-down menu (e.g. Last Adaptive, or Sweep, etc.).

10. Select the last two checkboxes as needed and click OK.

Preserve source design solution

This is the last option on the Setup Link dialog box. When the source design is closed or it is not included in the project manager window containing the target design, then the source design will not be saved. However, if you select this option, which is especially when you are using Maxwell or SIWave the source design is saved.

11. Close the Setup Link dialog, and if necessary, specify the Translation of Source Origin Relative to This Design on the Near Field Wave Options panel of the Incident Wave Source dialog box.

12. If required check the option Source Design is Fully Inside This Design.

When a source design is totally inside the target design, it should not be included into the near/far field calculation. If it is totally outside, the far field calculation should also integrate over the radiation surfaces of the source project.

13. If required check Include Source Power in Antenna Parameters.

The antenna parameters include power-related entries such as incident power, accepted power, radiated power. If you check Include Source Power in Antenna Parameters the antenna parameters in the design that receives the fields from a source design will be based on a power set for the excitations in the source design under HFSS>Fields >Edit Sources. For instance, this can be the power with which a port in a source antenna is excited. If the antenna in a source design is excited with 10 W, then the antenna parameters panel in the receiving design will show an incident power of 10 W.

14. Click Finish to close the dialog. The Near Field wave source point and direction is highlighted in the modeler window, and the wave appears in the Excitations list in the Project.