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HFSS and Planar EM Simulators >
Using the Estimate Module >
Estimating Dimensions of Printed Antennas >
Estimating Rectangular Patch Parameters

Estimating Rectangular Patch Parameters

Use this command to obtain a rough estimate of the resonating length of a rectangular patch. This command also estimates the bandwidth and the radiation efficiency of the patch as well as the location on the patch that corresponds to a user-specified impedance value.

Before using this command, keep the following in mind:

• The method used is an approximate method based on the cavity model. The numbers estimated by this command are only rough estimates. Depending on the layer parameters, the patch parameters may be different for patches on different layers; therefore, it is important that you select the desired trace layer before using this command.

• The estimated values may not agree exactly with the values computed by the simulation engine. The purpose of this command is to help you obtain a first iteration design. If you are designing a patch, you can use the rough dimensions as a starting point. With these, you can draw and simulate the structure, then fine-tune the design.

• This command is disabled if your structure does not contain ground planes or if it contains two ground planes and you have selected a metal layer between them.

To estimate a rectangular patch:

1. Select the trace layer on which the patch lies.

2. Click Printed Antennas>Rectangular Patch. Estimate parameters appear on the right side of the Estimate module’s window.

3. Select Square Patch to enable the square patch option. For square patches, you do not need to specify the non-resonating length of the patch, which would be entered in the Vertical Length, W box.

4. Enter the frequency in the Frequency box, in GHz. This frequency is independent of the maximum frequency entered in the solution setup.

5. Enter the dimension for the non-resonating edge of the rectangular patch in the Vertical Length, W box. The number must be greater than 0. The units are the same as the current working units.

For a rectangular patch, the resonating edge of the patch is along the horizontal, or x, direction and the non-resonating edge is along the vertical, or y, direction. This box is disabled if the Square Patch option is selected.

6. Enter the desired voltage standing wave ratio (VSWR) in the VSWR box. The number entered must be greater than or equal to 1. This value is used to estimate the bandwidth of the patch.

7. Enter the desired input impedance in the Input Impedance box, in ohms. The number you specify must be greater than 0. This option is useful for finding an optimal location for feeding or loading the patch. When the estimate is calculated, Designer will estimate a location on the patch where the input impedance is close to the value you specified.

8. Click Calculate to perform the estimate. The estimated information appears in the following boxes:

Horizontal Length, L	Displays the estimated length for the resonating edge of the patch antenna. The units are the same as the current working units.
Bandwidth(%)	Displays the estimated bandwidth (in percent) at the VSWR setting you specified for the patch antenna.
Radiation Efficiency (%)	Displays the estimated radiation efficiency (in percent) for the patch antenna.
Impedance Location	Displays the approximate location on the patch where the input impedance is close to the impedance you specified. This location is specified by a horizontal offset and a vertical offset. The Horizontal Offset and Vertical Offset boxes display these offset values. The horizontal offset value is the distance along the x direction relative to the lower-left node of the patch. The vertical offset value is the distance in the y direction relative to the lower-left node of the patch. The unit for these boxes is the same as the current working unit.

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