Sonnet User's Guide - Sonnet Software

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<strong>Sonnet</strong> User’s <strong>Guide</strong> Air Dielectric Bricks Dielectric bricks can be made of any dielectric material and can be placed in any circuit layer. This allows, for instance, “alumina” bricks to be created in an “air” circuit layer. However, it is also possible to reverse this scenario. Dielectric bricks made of “air” can also be created in alumina circuit layers. This is an important consideration to remember. Depending upon the circuit geometry for a given application, this ability to reverse the dielectric characteristics may simplify the circuit and make it faster to analyze. Limitations of Dielectric Bricks Diagonal Fill Diagonal fill is not allowed for dielectric bricks. All dielectric bricks must use “staircase fill”. Thus, dielectric bricks with curved or rounded edges must be stairstep approximated. Note that the error caused by such an approximation decreases as the X and Y cell sizes are decreased. Thus, it is possible to make this error arbitrarily small by choosing sufficiently small X and Y cell sizes. Antennas and Radiation The far field viewer does not support dielectric bricks. Circuits containing dielectric bricks can be analyzed with the far field viewer, but the radiation effects of the dielectric bricks are not accounted for in the analysis. Interfaces The Agilent ADS Interface, Cadence Virtuoso Interface and AWR MWOffice do not create dielectric bricks. 266
Chapter 18 Dielectric Bricks Dielectric Brick Concepts Creating a Dielectric Brick To create a dielectric brick in the project editor, do the following: 1 Move to the circuit level where the base of the dielectric brick is to be located. The dielectric brick that is created will rest on this circuit level, and will extend upward to the next level. Dielectric bricks can be placed on any level, including the ground plane. If a brick is placed on the highest circuit level (level 0), it will extend up to the top cover of the metal box. 2 Create a base polygon which defines the cross-section of the brick. This is done by selecting either Tools ⇒ Add Dielectric Brick ⇒ Draw Rectangle or Tools ⇒ Add Dielectric Brick ⇒ Draw Polygon from the project editor’s main menu. The first option allows the vertices of arbitrarily shaped base polygons to be entered on a point by point basis. This option is used to create dielectric bricks with any cross-sectional shape. However, if the cross-section is rectangular in shape, it is often quicker to create dielectric bricks using the second option. Viewing Dielectric Bricks Once a dielectric brick has been created in the project editor, it is possible to “see” the brick from both the circuit layer where the base of the brick is located and the circuit layer where the top of the brick is located. On both levels, you will see a polygon which defines the cross-sectional shape of the dielectric brick. The brightness of the polygon, however, will vary. When you are on the top level, you will see a “dim” polygon; on the base level you will see a “bright” polygon. Only the outline of the dielectric brick is visible from levels other than the origination and termination of the dielectric brick. Note that while it is possible to “see” a brick from two different circuit levels, “selecting” a brick, for cutting, copying, moving, changing attributes, etc., can only be done from the circuit level where the base of the brick is located if you are in Single layer edit mode. The polygon can be selected on either level if you are in multilayer select. 267
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