Sonnet User's Guide - Sonnet Software

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Sonnet User’s Guide Some of the techniques used to mitigate box resonances include: • Adding grounded metal geometries to your structure – In many cases, ground vias or ground planes will help prevent box resonance modes from forming. In simple terms, they have the effect of dividing the structure into smaller compartments, thus pushing the box resonances higher in frequency. The use of a via fence or CPW type transmission line can help “channelize” the circuit, preventing unwanted coupling between traces and reducing unwanted box resonance effects. All of these features can be included in the Sonnet model. • Adding an absorptive material to the model – Another approach which is normally used once all other package design features have been optimized, is to add an absorbing material in the housing cavity. The material is normally iron or carbon loaded so it can provide a fairly high magnetic or electric loss tangent. It comes in various forms such as liquid or sheet and is usually placed at a position such that it has a minimal effect on the circuit performance and a great effect on the box resonance. The user can easily model this material in Sonnet by adding a dielectric layer to the stackup. 338
Chapter 23 Accuracy Benchmarking Chapter 23 Accuracy Benchmarking Electromagnetic analyses are often described as providing what is called “Good Agreement Between Measured And Calculated” (GABMAC). However, in the past, there has been little effort to decide just what “good” means. The more useful result is the “Difference Between Measured And Calculated” (DMAC). There is an example of a coupled stripline benchmark available in Help under Applications. An Exact Benchmark What we need to calculate DMAC is an exact benchmark. One source of an exact benchmark is stripline. The characteristic impedance of a stripline has an exact theoretical expression K(k) and is the complete elliptical integral of the first kind. 339
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