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Design and Analyze H-Notch Patch Using Design Variables

This example shows how to define the metal patch, dielectric, and ground plane layers in H-notch using design variables in the PCB Antenna Designer app.

Open New Session

Type this command at the command line to open the PCB Antenna Designer app.

pcbAntennaDesigner

On the Design tab, click New Session to start a new session and open a blank canvas.

Define Board Shape

To design a PCB stack, you must first define a board shape. Select Rectangle from the Shapes section on the toolbar. Drag the shape on the canvas to create a rectangle.

Use the Design Variables tab to add variables for the board center, board length, and board width. To add a new variable, click . Add the following to the table:

  • BoardCenter [0,0]

  • BoardLength 25

  • BoardWidth 25

Add the variables to the Rectangle1 properties tab.

Add Ground, Metal, and Dielectric Layer

Click Add Layer on the toolbar and then select Metal Layer to add a metal layer.

Set the Name of the metal layer to GroundPlane.

Click Add Layer on the toolbar and then select Dielectric Layer to add a dielectric layer DielectricLayer1.

Click Add Layer on the toolbar and then select Metal Layer to add a metal layer. Set the name of this layer to HNotchLayer.

Create H-Notch

Select the HNotchLayer on the PCB Stack navigation tree and then select Rectangle from the Shapes section on the toolbar. Drag the shape onto the canvas to create a rectangular patch.

Use the Design Variables tab to set the properties of the HPatch.

  • Center[0,0]

  • Length20

  • Width20

Create Top Notch

Select Rectangle from the Shapes section and drag the shape to the top of the shape to create a top notch in the patch layer. Set the properties of Rectangle3 to the following using the Design Variable tab.

  • Name TopNotch

  • Center[0,7]

  • Length6

  • Width6

Create Bottom Notch

Select TopNotch from the canvas and then copy the layer by clicking Copy in the Actions section. Click Paste to paste a copy of TopNotch. Doing so creates a rectangle TopNotch_Copy_1 with identical dimensions to the TopNotch layer.

Set the properties of TopNotch_Copy_1 to the following:

  • Name BottomNotch

  • Center[0,-7]

Subtract Top and Bottom Notch Layers from Metal Patch

Select HPatch and TopNotch and then click Subtract in the Shapes section of the toolbar to remove both rectangles.

Select the HPatch and BottomNotch and click Subtract in the Shapes section of the toolbar to remove both rectangles.

Set Dimensions for Ground Plane

The ground plane must be same size as the HNotchLayer. To make the ground plane the same size as HPatch, right-click HPatch and select Copy.

Right-click the GroundPlane and click Paste on the toolbar to paste the rectangle in the GroundPlane.

The app copies the rectangle to the ground plane layer with the name HPatch_Copy(1). HPatch_Copy(1) and HPatch have the same dimensions.

Set the properties of HPatch_Copy(1) to the following:

  • Name GroundPlaneRect

  • Center[0,0]

  • Length23

  • Width23

Add Feed

Select the HNotchLayer metal layer on the PCB Stack navigation tree and then click Add Feed in the Feed Via section on the toolbar. You can add a feed only to a metal layer.

As the PCB Stack navigation tree shows, the app adds the feed to HNotchLayer as Feed1.

Select the parent Feed node on the PCB Stack navigation tree, and then set the FeedDiameter to 1 and FeedViaModel to Strip. FeedDiameter is a global property.

Change Position of Feed

Select Feed1 on the PCB Stack navigation tree. In the Properties pane, set Center to [-3,-3].

In the 3D-View pane, you can see that the feed is connected only to HNotchLayer.

Change Start Layer and Stop Layer

Connect the feed from HNotchLayer to GroundPlane by setting StartLayer to HNotchLayer and StopLayer to GroundPlane. This creates a feed on the GroundPlane which connects to the HNotchLayer.

Change Metal Properties

Select the Layers in on the PCB Stack navigation tree and set the Type of the metal layer to Copper in the Properties pane.

Validate Design

Click Validate Design on the toolbar to validate your board shape, layers, feed, via, and load.

Analyze H-Notch Unit Element

In the Analysis tab, set the Center Frequency to 4.65 GHz and Frequency Range to 4:0.1:5 GHz

Run Analysis

Select Impedance from the Vector Frequency Analysis section on the toolbar to plot the impedance plot. The impedance plot shows that the PCB stack antenna resonates at 4.6 GHz.

Click 3D Pattern from the Scalar Frequency Analysis section on the toolbar to plot the 3-D far-field radiation pattern of the antenna. The directivity of the H-notch patch unit element is 5.93 dBi.